Entries |
Document | Title | Date |
20080205453 | Distributing a timing reference over a communications bus - On a communications bus, a relatively low frequency timing reference is distributed by regularly transmitting numbers that represent its instantaneous phase. An active framer component maintains a wrapping count of root superframes and, during each block, transmits in encoded form an expected value for the root superframe count at the start of the following block. | 08-28-2008 |
20080212616 | Services For Data Sharing And Synchronization - Systems and methods for sharing and synchronizing data using the addition of synchronization data to a feed that contains data items, and at least a node or endpoint that provides synchronization-related services to other endpoints, are disclosed. Such systems and methods, and client and service endpoints, may use the added synchronization data in multiple ways to share data, incorporate changes consistently, and resolve conflicts. | 09-04-2008 |
20080212617 | System and method for synchronization of time sensitive user events in a network - The present disclosure relates generally to systems and methods for synchronization of time sensitive user events in a network. In one example, the method includes receiving an event from a client during a time window and receiving another event from another client during the time window. The events, which are considered to have occurred simultaneously due to their arrival within the same time window, are combined into a picture packet and the picture packet is sent to the first and second clients for execution. | 09-04-2008 |
20080212618 | Method and System for Transmitting a Clock Rate on an Ethernet Network Link and Applications Thereof - The invention relates to a method for transmitting a clock rate on a network link, seat of a speed timing signal (DR), consisting of at least synchronizing (A), at an input point (I) of this network, this speed timing signal with a reference external clock rate (ESR) for generating a synchronized speed timing signal (SDR) propagating on the network, and of extracting, at an output point (O) of the network, the reference external clock rate (ESR) from the synchronized speed timing signal (SDR) for utilization. The invention is for providing networks that are seats of a speed timing signal such as FastEthernet and Gigabit Ethernet networks or of higher speed Ethernet networks. | 09-04-2008 |
20080212619 | CLOCK SYNCHRONISATION OVER A PACKET NETWORK - A method of synchronising first and second clocks coupled respectively to ingress and egress interfaces | 09-04-2008 |
20080219294 | Network Element Manager Resynchronization - A network element manager ( | 09-11-2008 |
20080225897 | Providing clock synchronization in a network - In one embodiment, an apparatus for providing clock synchronization in a packet-based network, the network having as components nodes and links therebetween and having a network topology, is arranged to compute a forward clock synchronization packet path to a synchronization destination from the network topology according to a computation rule such that the return path for a clock synchronization packet from the synchronization destination is the same as the forward path. | 09-18-2008 |
20080225898 | Method and apparatus for detecting and compensating for jitter in a communications network - Jitter in a clock signal can cause communications faults in communications networks, such as in networks in which downstream nodes use recovered clock signals as timing for upstream communications. An embodiment of the present invention detects and compensates for jitter in a network by recovering a reference clock associated with communications signals between nodes, such as an Optical Line Terminal (OLT) and Optical Network Terminal (ONT) in a Passive Optical Network (PON). A local clock is synchronized with the reference clock. Jitter induced faults may be detected and compensated for by increasing the synchronization rate, then decreasing the synchronization rate until jitter induced faults begin to occur. A loss or change in a rate of communications errors occurring as a function of the synchronization rate may be monitored and reported to a system operator. Compensating for jitter by adjusting the synchronization rate provides for robust communications between network nodes. | 09-18-2008 |
20080225899 | System and method for the synchronization and distribution of telephony timing information in a cable modem network - A method for synchronizing clocks in a packet transport network. The method comprises, receiving an external network clock at a central packet network node and transmitting timing information to a plurality of packet network devices, the timing information based upon the external network clock. The method further comprises, transmitting and receiving data that is synchronized to the timing information to a plurality of connected packet network devices. And finally, delivery of packets to an external interface via a packet network that contains data synchronized to the external network clock. | 09-18-2008 |
20080240163 | System and method for maintaining transmission synchrony - Method for maintaining transmission synchrony in wireless communications networks. An embodiment includes computing a transmission time for a packet, adding an adjustment to the transmission time in response to a determining that clock drift has occurred between a local clock and a clock of a host device, and scheduling the packet for transmission at the transmission time. The adjustment is based on timing information provided by control instructions transmitted by the host device. The adjustment is computed using timing information from consecutively received control instructions and a single clock contained in a wireless device. If clock drift has occurred, then the timing information will differ significantly for the two control instructions. The ability to perform the clock drift calculation using a single clock may help to keep the cost and power consumption of the wireless device as low as possible. | 10-02-2008 |
20080240164 | METHOD FOR DATA CONVERTER SAMPLE CLOCK DISTRIBUTION - A unit for use in a communication system comprises a communication module having an oscillator configured to generate a master clock signal; a plurality of conversion modules; and a distribution component configured to distribute the master clock signal from the communication module to each of the plurality of conversion modules. Each of the plurality of conversion modules comprises a filter configured to filter the master clock signal; and a converter configured to use the filtered master clock signal in converting between analog and digital signals. | 10-02-2008 |
20080240165 | METHOD AND SYSTEM FOR SYNCHRONIZATION OF CONTENT RENDERING - A method and system for synchronizing the rendering of content at various rendering devices. Each rendering device has a device time and a rendering time. The synchronization system designates one of the rendering devices as a master rendering device and designates all other rendering devices as slave rendering devices. Each slave rendering device adjusts the rendering of its content to keep it in synchronization with the rendering of the content at the master rendering device. The master rendering device sends a message with its rendering time and corresponding device time to the slave rendering devices. Each slave rendering device, upon receiving the message from the master rendering device, determines whether it is synchronized with the master rendering time. If not, the slave rendering device adjusts the rendering of its content to compensate for the difference between the master rendering time and the slave rendering time. | 10-02-2008 |
20080259965 | Receiving Data Comprising Synchronization Information - A method receives data including synchronization information. The method includes obtaining a synchronization for receiving the data based on the synchronization information. The method includes generating, during receiving of the data, maintenance information indicative of whether the synchronization is being maintained based on the synchronization information. The method includes continuing, upon loss of the synchronization, to generate the maintenance information based on the synchronization. | 10-23-2008 |
20080259966 | Synchronization of one or more source RTP streams at multiple receiver destinations - In one embodiment, a method includes synchronizing to a common reference timeframe between a sender node and a plurality of receiver nodes connected over a packet-based network. The sender node sends Real-Time Protocol (RTP) frames to the receiver nodes, and also sends a RTP Control Protocol (RTCP) sender report to each receiver node that contains a rendering offset value, each receiver node rendering the RTP frames at a render time equal to a sampling time in units of the common reference timeframe plus the rendering offset value. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. | 10-23-2008 |
20080259967 | Method and arrangement for transmitting time stamp information - The invention relates to transmitting time information between elements of a data network. In the present invention, it has surprisingly been discovered that in a network transmitting packet, frame or cell switched data traffic, time stamp information can be transmitted from a network element ( | 10-23-2008 |
20080267221 | Data Sharing and Synchronization with Relay - Systems and methods for sharing and synchronizing data using the addition of synchronization data to a feed that contains data items, and in some implementations, at least a node or endpoint that provides relay functionality or relay capabilities to one or more endpoints, are disclosed. Such systems and methods may also include the communication of information about the data that is synchronized, in addition to synchronization of the data itself. | 10-30-2008 |
20080267222 | System for combining a plurality of video streams and method for use therewith - A system for combining a plurality of video streams includes a time stamp adjustment module that generates an adjusted second video stream by adjusting a plurality of time stamps of a second video stream. A video stream concatenation module generates a combined video stream by concatenating the adjusted second video stream to an end of a first video stream. | 10-30-2008 |
20080279223 | Method for Synchronizing Charging Processes Involved in Performance of Service on Network Elements in Communication Network - A control protocol using mechanisms of a transport protocol is used to distribute control messages containing specific dedicated information for each charging process involved in the performance of a service or application to each charging process required in the performance of the service or application. | 11-13-2008 |
20080279224 | Alignment and Deskew For Multiple Lanes of Serical Interconnect - Methods and apparatus are provided for data communication between a transmitter and receiver over a plurality of serial links, which cause the transmitter to send serialized groups of bits down each lane, in such a way that the first bit of each group (each lane) is guaranteed to arrive in the correct order at the receiving end. Various embodiments of the present invention include declaring a budget for the maximum skew between lanes. In such embodiments, subsequent to determining the skew budget between lanes, the data to be transmitted is divided into groups of N bits, where N is any convenient number larger than M times S, with M being the number of lanes and S being the budgeted skew, in bit times. | 11-13-2008 |
20080279225 | Synchronized Receiver - There is provided a method of operating a communications system comprising a transmitting station and a receiving station, the method in the transmitting station comprising encoding a clock signal with data to form encoded signals for transmission; transmitting the encoded signals to the receiving station; the method in the receiving station comprising decoding the encoded signals to extract the clock signal and data; processing the data under the control of the decoded clock signal. The method further comprises, when no data is required to be transmitted to the receiving station, transmitting further encoded signals to the receiving station in order for the receiving station to decode the further encoded signals and extract a clock signal. | 11-13-2008 |
20080285596 | SYSTEM AND METHOD FOR FINE-GRAINED, END-TO-END TRAFFIC SCHEDULING ACROSS HETEROGENEOUS LOCAL AREA NETWORKS - A system and method for fine-grained, end-to-end traffic scheduling across heterogeneous local area networks (LANs). A system may include a network, where the network comprises multiple heterogeneous network, technologies. The system also may include at least two devices coupled to the network, where clocks of the at least two devices are synchronized. The system also may include a scheduler coupled to the network, where the scheduler creates a network wide data traffic schedule and where the data traffic schedule determines when each of the at least two devices can send data into the network. Other embodiments are described and claimed. | 11-20-2008 |
20080285597 | SYNCHRONIZING SEPARATED EDGE QAM DEVICES LOCATED REMOTELY FROM A CMTS - The clocks of one or more edgeQAM devices are synchronized with a master clock at the remotely located CMTS. A master clock signal may be transmitted via a dedicated gigabit Ethernet link. Alternatively, master clock information contained in a time synchronization message may be transmitted for use in adjusting local oscillators that drive local clocks at respective edgeQAM devices. | 11-20-2008 |
20080291944 | Method for Real-Time Synchronizing Configuration Data Between Element Management Systems and Network Elements - The present invention discloses a method for synchronizing the configuration data between an EMS and a NE, which includes: dividing the configuration data in the NE into several layers so that different configuration data layers include different minimum unit configuration data sets; setting a minimum unit identifier word for each configuration data layer to identify the configuration data changes of the configuration data layer; when the configuration data of the NE is changed, changing the corresponding identifier word and sending a configuration changed event notification to EMSs; after receiving the configuration changed event notification, the EMS synchronizes the configuration data according to the event notification. With the present invention, it is possible to make the EMS effectively monitor and synchronize configuration data with the NE in a real-time manner, so that network management efficiency can be improved. | 11-27-2008 |
20080298398 | Transparent Spider - A timing bridge device is used to gain boundary and transparent clock functionality using conventional network components on those network links that require good timing distribution. This timing path is invisible to the network component. | 12-04-2008 |
20080298399 | Methods for Synchronizing the Transmission and the Reception of a Media Stream Over a Network - The present invention relates to methods for synchronizing the transmission and the reception of a media stream over a network, such as the Internet, comprising of a receiver clock having an adjustable reset value, where the adjustable reset value may be a function of the reference time for a receiver clock and the reference time for a sender clock. | 12-04-2008 |
20080304521 | INTERNAL SIGNALING METHOD TO SUPPORT CLOCK SYNCHRONIZATION OF NODES CONNECTED VIA A WIRELESS LOCAL AREA NETWORK - This invention discloses a set of internal signaling (i.e., management primitives) to support a clock-synchronization protocol for wirelessly synchronizing clock registers of wired or wireless nodes via a wireless local area network (i.e., 802.11 network). The clock synchronization is performed between two higher-layer protocol entities residing within two different wireless stations (STAs). | 12-11-2008 |
20080310459 | Telecommunications control device autonomously determining transmission timing and a method therefor - A network node constituting a telecommunications system together with one or more neighboring nodes includes a telecommunications control device, which includes a timing control signal receiver for receiving timing control signals transmitted from the neighboring nodes, and a transmission timing calculator for determining data transmission timing of the network node, based on reception timing of the timing controls signal of the neighboring nodes. The device further includes a timing control signal transmitter for transmitting a timing control signal with a phase indicative of data transmission timing of the network node reflected, a data communicator for transmitting and receiving a data signal to and from the neighboring nodes, and a phase state manager for controlling transmission of the timing control signal and data signal in accordance with the phase state of the network node. | 12-18-2008 |
20080317068 | SERVER-ASSISTED AND PEER-TO-PEER SYNCHRONIZATION - Systems and methods for synchronizing data between endpoints using elements of centralized and decentralized synchronization systems and communication topologies are disclosed. Such systems and methods may in some cases synchronize some subset of data with a centralized endpoint while another subset of data is synchronized in a decentralized fashion directly with other endpoints. Such systems and methods may include a variety of cooperative functionality to assist in the synchronization of data between endpoints. | 12-25-2008 |
20080317069 | Speed negotiation for multi-speed communication devices - A method includes defining a pattern of time intervals, each time interval having a respective assigned communication speed, which alternates among multiple communication speeds supported by a first communication device. Synchronization requests are transmitted over a communication medium from the first communication device to a second communication device at the respective communication speed that is assigned in each interval in accordance with the pattern. While transmitting the synchronization requests, synchronization replies sent over the communication medium in response to the synchronization requests are received only at the respective communication speed that is assigned in each interval. Responsively to receiving the synchronization replies from the second communication device, one or more common communication speeds that are supported by both the first and the second communication devices are identified. Communication is established between the first and second communication devices over the communication medium using one of the common communication speeds. | 12-25-2008 |
20090003387 | Synchronization Between Connection Manager and Extension Components - This disclosure describes synchronization between a connection manager and extension components during terminal service starts, stops, and restarts. The synchronization occurs by application programming interfaces as mechanisms to notify extension components that a change of state is about to occur. The extension components take appropriate action steps, such as saving session information for a connection pertaining to a connection stop and restoring connection session information when the terminal service is restarted. Furthermore, the extension components may implement own caching mechanisms and selectively perform lazy restore on save data as necessary. As a result, experience for the user is enhanced by not losing any data when the terminal service is stopped and restarted. Also, administrators may perform a patch on terminal service binaries without waiting for all users to log off or without rebooting the system. | 01-01-2009 |
20090003388 | METHOD AND APPARATUS FOR SYNCHRONIZING PORTED NUMBER DATA - A method of synchronizing ported number data within a telecommunications network in which a number portability administration center has received a request from a subscriber having a directory number (DN) to port is provided. The method comprises the steps of: a Number Portability data manager sending a subscription request to the NPDB to receive future notifications about subscriber ports to/from specific Location Routing Number(s); the NPDB honoring these subscriptions when a user ports their DN. If this is the initial LRN assigned to the DN, then the NPDB derives the LRN of the code holder. If the LRN from which the subscriber ported has a subscription, then the NPDB sends a notification message to the NP data manager with which the LRN is associated indicating that the DN ported out. If the LRN to which the subscriber ported has a subscription, then the NPDB sends a notification message to the NP data manager with which the LRN is associated indicating that the DN ported in. The method further comprises receiving a notification message for the LRN at a number portability data manager, wherein: if the notification message indicates that a DN has ported in, then the number portability data manager sends a request to an ENUM (telephone number mapping) server to turn the entry for that DN on; and if the notification message indicates that a DN has ported out, then the number portability data manager sends requests to the ENUM server and to a subscriber database to turn the entry for that DN off. | 01-01-2009 |
20090016382 | System and Method for High-Speed Applications over a Serial Multi-Drop
Communication Network - Broadcasting of high-speed applications over a serial multi-drop communication network is achieved by time-division multiplexing the high-speed applications to produce a data stream, framing the data stream into frames having a header of a size lower than 32 bits and a parity bit, transmitting the frames with pre-emphasis over the serial multi-drop communication network, receiving the frames with de-emphasis from the serial multi-drop communication network, detecting a predetermined bit pattern in the received frames, synchronizing the received frames using an internal clock signal and an external clock signal found within the frames following a phase comparison made after detection of the predetermined bit pattern, and de-framing the synchronized frames into a selected one of the high-speed applications. The system implementing the above process is adapted to broadcast hi-fi audio channels and possibly other types of data to entertainment stations connected to the communication network. | 01-15-2009 |
20090028191 | METHOD FOR EXCHANGING DATA BETWEEN STATIONS FROM DIFFERENT NETWORKS - The invention relates to a method for exchanging data between stations or nodes ( | 01-29-2009 |
20090046744 | COMMUNICATION CONTROL APPARATUS, COMMUNICATION CONTROL METHOD, AND COMPUTER PROGRAM - A communication control apparatus includes a packetizing unit configured to generate packets based on coded data; a calculating unit configured to calculate, based on at least one of information regarding the amount of code of the coded data, reception state information indicating a reception state of a reception device serving as a transmission destination to which the packets are to be transmitted, information regarding the effective speed of a communication line to be used for transmission of the packets, and information regarding an available capacity of a communication channel that can be ensured for communication of the packets, the number of packets to be continuously transmitted; and a transmitting unit configured to continuously transmit, via the communication line to the reception device, packets corresponding to the number of packets calculated by the calculating unit. | 02-19-2009 |
20090052474 | SELECTIVE BUILD FABRIC (BF) AND RECONFIGURE FABRIC (RCF) FLOODING - In one embodiment, detecting an initialization of a synchronization phase of a network device in a fiber channel fabric, performing synchronization phase optimization of the network device to select a predetermined number of interfaces, and transmitting a synchronization request on the predetermined number of interfaces, are provided. | 02-26-2009 |
20090059962 | SYNCHRONIZING RELATED DATA STREAMS IN INTERCONNECTION NETWORKS - A method and apparatus for synchronizing related data streams in interconnection networks. Some embodiments of an apparatus include a transmitter to transmit a data stream to a second apparatus, where the transmitter transmits a data packet to the second apparatus. The apparatus further includes a clock, with the apparatus providing a first timestamp for the data packet using the clock upon transmission of the data packet. The apparatus includes a receiver to receive responses from the second apparatus, with the apparatus providing a second timestamp upon receiving a returned packet from the second apparatus, with the returned packet containing timestamps for the receipt and transmission of the packet by the second apparatus. The apparatus includes a network unit to direct the operation of the apparatus, the network unit to determine a start time for decoding of the data stream by the second apparatus based at least in part on the timestamps for the packet. | 03-05-2009 |
20090059963 | LINE TERMINAL FOR DETERMINING OPERATIONAL STATUS OF A U INTERFACE - A line terminal for determining operational status of a U interface includes a time presetting module, a current detecting module, a cycle selecting module, a timer, and a synchronization determining module. The time presetting module is for presetting a plurality of time cycles. The current detecting module is for detecting a loop current flowing via the U interface. The cycle selecting module is for selecting a time cycle from the plurality of time cycles. The timer is for timing during the time cycle. The synchronization determining module is for determining if a line terminal has been synchronized with a digital service unit. The operational status of U interface is determined to be working normally when the line terminal has been synchronized with the digital service unit. A method for determining the operational status of U interfaces is also provided. | 03-05-2009 |
20090067452 | SYNCHRONIZATION USING MULTICASTING - A process to synchronize information transmitted from an information provider to a plurality of network elements is provided. The process determines a temporal difference between related network elements and compensates for this difference by dilating an information signal provided to at least one of the network elements to resynchronize the data presented to the network elements. The process is repeated periodically in order to maintain a desired synchronization level. | 03-12-2009 |
20090086764 | System and method for time synchronization on network - A system and method for time synchronization on a network is provided. According to the system and method for time synchronization, a slave clock device does not continuously receive a time synchronization message periodically transferred from a master clock device and thus does not correct its time upon all such occasions. Rather, the slave clock device requests time information from the master clock device only when the slave clock device needs to correct its time, and receives a time synchronization message transferred from the master clock device and compensates for its time deviation only while the slave clock device is activated, thereby reducing its power consumption and amount of computation. | 04-02-2009 |
20090086765 | Synchronization system, synchronization signal transmitter, clock supplier, and synchronization method - A synchronization system for establishing synchronization between a first communications device and a second communications device connected through a communications line transmitting an xDSL signal is disclosed that includes a clock extraction part configured to extract, from a synchronous network connected to the first communications device, the synchronization clock signal of the synchronous network; a synchronization signal generation and transmission part configured to generate a synchronization signal from the synchronization clock signal and to transmit the synchronization signal to the communications line, the synchronization signal having a frequency in a frequency band different from the frequency band of the xDSL signal; a synchronization signal extraction part configured to extract the synchronization signal from the communications line; and a clock reproduction and output part configured to reproduce the synchronization clock signal from the synchronization signal and to supply the synchronization clock signal to the second communications device. | 04-02-2009 |
20090086766 | Method for transmitting synchronization messages in a communication network - There is described a method for transmitting synchronization messages in a communication network, the communication network comprising a plurality of network nodes communicating with one another, each containing an internal clock, which is timed with a node clock frequency assigned to the respective network node. The synchronization messages transmitted in the communication network serve to synchronize the times of the internal clocks of the network nodes and contain the pulse counter status of a synchronization clock operating at a predefined synchronization clock frequency. The pulse counter status is estimated by each network node and updated in the synchronization message. Changes in the synchronization clock frequency are taken into account when estimating the pulse counter status. Precise determination of the pulse counter status is achieved with the aid of an approximation of the change over time in the pulse ratio between synchronization clock frequency and node clock frequency by means of a function, with the result that the pulse ratio on transmission of a new synchronization message can be predicted and a precise current pulse counter status can be determined on the basis of the predicted pulse ratio. The method is particularly suitable for use in a communication network of an industrial automation system, whose components communicate with one another for example according to the Profinet standard. | 04-02-2009 |
20090097505 | Multiplexing Network System And Digital Information Transferring Method - In a multiplexing network system in which media devices are interconnected through a digital transmission path, during system startup, a device that is used as a master device holds management information for recognizing bands used by media devices connected to the digital transmission path and management information for recognizing what type of data is output/received between the media devices. During the system startup, the master device refers to the management information to set the compression rates of data streams transferred between the media devices to be variable. | 04-16-2009 |
20090103570 | Time Synchronization in Serial Communications - A real-time clock ( | 04-23-2009 |
20090103571 | Under sampled clock signal synchronization aid device and device for reconstructing undersampled clock signals, for a packet-switched network - A synchronization aid device is part of receiving communication equipment of an IP network, having a primary clock signal consisting of primary clock pulses spaced apart by a first period. This device comprises i) a required to increment its value by one unit on each primary clock pulse and reset its value to zero each time it reaches a value M, ii) detection means required to generate a secondary clock pulse each time the value of the counter is zero, the secondary clock pulses forming a secondary clock signal having a second period equal to M times the first period, and iii) control means required, each time the receiving equipment receives a packet containing at least one first bit having a first value, to initialize the counter with a chosen value. | 04-23-2009 |
20090103572 | Crosstalk Minimization in Serial Link Systems - Described are methods and circuits for reducing the error-inducing effects of crosstalk. Communication circuits in accordance with some embodiments adjust the phase of transmitted “aggressor” data to misalign transmitted signals from the perspective of “victim” channels. This misalignment moves the noise artifacts cross coupled to the victim channel away from sensitive sample times in the victim data, and consequently reduces the net effects of aggressor crosstalk on neighboring victim channels. Some embodiments reduce the effects of crosstalk by introducing static timing offsets to one or a plurality of aggressor transmitters, one or a plurality of victim transmitters, or some combination of aggressor and victim transmitters. Other embodiments dynamically alter the relative timing of aggressor and victim transmitters. | 04-23-2009 |
20090122812 | SAFE START-UP OF A NETWORK - A method for start-up of a network, including a number of nodes, which are connected via channels. The nodes exchange information in the form of messages via the channels. The transition phase of a synchronizing node from its initial phase to a synchronized phase is separated in a first integration phase and a second subsequent cold-start phase. A synchronizing node in the integration phase listens to messages being sent from nodes in the synchronized phase and only reacts to an integration message (i-frame) if the integration message is a valid message. Furthermore, a synchronizing node, wherein integration of the synchronizing node to a set of already synchronized nodes was not successful after a specifiable period, changes into the cold-start phase, in which a cold-start procedure of the node is extracted, wherein in the cold-start phase the node does not react to integration messages of a node in the synchronized phase. | 05-14-2009 |
20090122813 | METHOD, SYSTEM AND APPARATUS FOR TIME SYNCHRONIZATION - A method for time synchronization that includes sending, by a master node, synchronization time information to a slave node through a section overhead, adjusting, by the slave node, a time of the slave node to achieve time synchronization according to the synchronization time information carried in the received section overhead. A system, a master node, and a slave node for time synchronization are also provided. With the disclosure, the synchronization time information is not affected by tributary pointer adjustment and no phase transient occurs when the coding signal of the synchronization time information is transmitted. As a result, the precision of time synchronization is improved. | 05-14-2009 |
20090135854 | SYSTEM AND METHOD FOR CLOCK SYNCHRONIZATION - A system and a method are provided for clock synchronization. The method includes receiving a new transmitter timestamp based upon a transmitter clock, determining a new transmitter timestamp delta between the new transmitter timestamp and a previous transmitter timestamp, determining a new receiver timestamp delta between a new receiver timestamp and a previous receiver timestamp, comparing the new receiver timestamp delta to the new transmitter timestamp delta, and adjusting a receiver clock to minimize a compared difference between the new receiver timestamp delta and the new transmitter timestamp delta. The new receiver timestamp is determined upon reception of the new transmitter timestamp. The previous receiver timestamp is determined upon reception of the previous transmitter timestamp. | 05-28-2009 |
20090135855 | Apparatus for automatically synchronizing setting information of wireless device - Provided is a portable device having an automatic setting information synchronizing function for a two-way radio communication. The portable device includes a radio communication unit for transmitting/receiving data to/from an external fixing device via a two-way radio communication, an input/output unit for providing an input/output interface, a synchronizing unit for receiving setting information from the external fixing device, and a central processing unit for controlling the radio communication unit, to thereby receive the setting information through the synchronizing unit upon connection with the external fixing device and to transmit/receive various data inputted/outputted through the input/output unit based on the received setting information via the two-way radio communication upon release of connection with the external fixing device. | 05-28-2009 |
20090135856 | MULTIMEDIA APPARATUS AND SYNCHRONIZATION METHOD THEREOF - A multimedia apparatus and a synchronization method thereof are provided. The multimedia apparatus includes a video output unit which outputs a video, and a control unit which transmits an audio signal to the external device through the communication module and operates the video output unit to display a video corresponding to the audio signal by delaying the video based on delay information received from the external device through the communication module. | 05-28-2009 |
20090141743 | Advanced clock distribution mechanism for circuit emulation applications - A clock distribution mechanism for circuit emulation applications, and related method, including one or more of the following: a plurality of digitally controlled oscillators, each of the plurality of digitally controlled oscillators receiving one or more Ethernet packets and generating a recovered clock from the one or more Ethernet packets; a multiplexer for receiving the recovered clocks generated by the plurality of digitally controlled oscillators, selecting a one of the recovered clocks generated by the plurality of digitally controlled oscillators, and outputting the selected one of the recovered clocks; a normalizer that receives a frequency of the selected one of the recovered clocks and generates a normalized frequency output based on the received frequency of the selected one of the recovered clocks and outputs the normalized frequency output; a clock source selector for receiving a plurality of input clock sources, one of the input clock sources being the normalized frequency output of the normalizer, the clock source selector selecting the normalized frequency output from among the plurality of input clock sources and transmitting the selected normalized frequency to a node; and one or more nodes for receiving the selected normalized frequency. | 06-04-2009 |
20090141744 | AUTOCRATIC LOW COMPLEXITY GATEWAY/ GUARDIAN STRATEGY AND/OR SIMPLE LOCAL GUARDIAN STRATEGY FOR FlexRay OR OTHER DISTRIBUTED TIME-TRIGGERED PROTOCOL - A special node is used in a distributed time-triggered cluster. The special node comprises protocol functionality to establish a time base to use in communicating with a plurality of end nodes and to source timing-related frames to the plurality of end nodes in accordance with the distributed time-triggered communication protocol. The protocol functionality establishes the time base without regard to any timing-related frame sourced from any of the plurality of end nodes. In one embodiment, the protocol functionality of the special node is implemented in a low complexity manner. In one embodiment, the cluster comprises a star topology and the special node performs at least one of semantic filtering and rate enforcement. In another embodiment, the cluster comprises a bus or peer-to-peer topology and each end node is coupled to the communication channel using a low-complexity special local bus guardian. | 06-04-2009 |
20090141745 | NETWORK APPARATUS AND NETWORK SIGNAL PROCESSING METHOD - A network apparatus, for processing a network signal and outputting an output signal, includes an asynchronous signal processing module, a sampling rate converter and a synchronous signal processing module. The asynchronous signal processing module operates in an asynchronous domain, and is utilized for receiving and processing the network signal to generate a first processed signal. The sampling rate converter is coupled to the asynchronous signal processing module, and is utilized for performing sampling rate conversion on the first processed signal to generate the output signal. A first operating frequency of the asynchronous signal processing module is different from a second operating frequency of the synchronous signal processing module. | 06-04-2009 |
20090147806 | SYNCHRONIZATION OF NETWORK NODES - A method and apparatus are provided to achieve frequency synchronization between a first clock at a first node and a second clock at a second node of a packet-carrying communications network. At the first node: a property of packet transmission through the network between the first node and the second node is measured; and the measurement of the property is sent to the second node. At the second node, the same property of packet transmission through the network between the first node and the second node is measured. The measurement of the property made at the first node and the measurement of the property made at the second node are used to synchronize the frequency of the second clock with respect to the first clock. | 06-11-2009 |
20090168808 | APPARATUS AND METHOD FOR PERFORMING TIME SYNCHRONIZATION USING GPS INFORMATION IN COMMUNICATION SYSTEM - Disclosed is an apparatus and a method for performing time synchronization by using Global Positioning System (GPS) information in a communication system. The apparatus comprises a grand-master node having a GPS receiver, for generating a synchronizing message required to synchronize time on slave nodes by using Time Of Day (TOD) information received from the GPS receiver and at least one slave node for receiving the synchronizing message required to synchronize time from the grand-master node or from another slave node, for carrying out time synchronization operation by using an Offset and Frequency Compensation Clock (OFCC) synchronization process supporting time offset and frequency separation compensation, and for generating a synchronizing message required to synchronize time on other slave nodes. | 07-02-2009 |
20090168809 | METHOD AND APPARATUS TO JOINTLY SYNCHRONIZE A LEGACY SDARS SIGNAL WITH OVERLAY MODULATION - Methods and apparatus are presented for the joint synchronization of legacy signals with overlay modulation signals in a communications system utilizing a hierarchical modulation scheme. In exemplary embodiments of the present invention, a synchronization signal can be sent in each of the legacy and overlay bit streams, each using a different approach to frame synchronization, and the two synchronization signals can be used in a complementary manner to synchronize both bit streams. In exemplary embodiments of the present invention a legacy physical frame and an overlay physical frame can be aligned in time. In exemplary embodiments of the present invention a key synchronization signal in a legacy bit stream can be time distributed throughout a legacy transmission frame and can be utilized to assist in both the synchronization of such legacy bit stream and of an overlay bit stream. Additionally, in exemplary embodiments of the present invention, a key synchronization signal in an overlay bit stream can be sent in one fixed physical frame of an overlay transmission frame, and can be utilized to assist in the synchronization of such overlay bit stream as well as legacy data, in a manner that complements the use of the synchronization signal provided in the legacy bit stream. | 07-02-2009 |
20090168810 | SOURCE SYNCHRONOUS LINK WITH CLOCK RECOVERY AND BIT SKEW ALIGNMENT - A high speed transmission system transfers data streams over a plurality of data links. Each data link may carry a number of bit streams. On the transmitting end, multiplexers serialize the bit streams, which are then transmitted to the receiving end. A clock signal is not transmitted over the optical link. Instead, an indication of the appropriate clock signal frequency and phase is embedded in the transmitted data. At the receiving end, a clock recovery circuit generates a clock signal of an appropriate frequency and phase based on the embedded indication. The new clock signal is used to sample and reconstruct the original data streams. | 07-02-2009 |
20090175299 | SIGNAL DETECTION DEVICE AND SIGNAL DETECTION METHOD - A correlation unit ( | 07-09-2009 |
20090180497 | Communication Device and Method for Data Transmission - Disclosed is a method and device for transmitting data between at least two transmitters and a receiver which are connected to a bus. A synchronization signal is applied to the bus and a number of data volume counters corresponding to the number of transmitters reduced by one is set to a predefined initial value. A first transmitter transmits in the form of data elements a predefined data volume allocated to the transmitter over the bus to the receiver. The data volume values of the other transmitters are selected so that only one transmitter at any given time simultaneously transmits on the bus. | 07-16-2009 |
20090196311 | INITIATION AND EXPIRATION OF OBJECTS IN A KNOWLEDGE BASED FRAMEWORK FOR A MULTI-MASTER SYNCHRONIZATION ENVIRONMENT - The subject disclosure relates to synchronizing among network nodes in a multi-master synchronization environment where a knowledge based synchronization framework is extended to include notions of initiation and/or expiration of synchronized object(s). Advantageously, according to the synchronization framework, endpoints can synchronize data in a way that allows a definition of when one or more objects of the synchronized data should come into existence for purposes of a knowledge exchange and/or when one or more objects of the synchronized data should cease to exist for purposes of a knowledge exchange. In one embodiment, additional dimension(s) are placed on a knowledge vector for a given object that represent incremental lifetime information for the object, which is accounted for during the synchronization process to allow operations on the object by synchronizing applications or processes during its lifetime. | 08-06-2009 |
20090196312 | Integrated circuit - An integrated circuit multiplexes transmission data faster than by a system clock, and transfers a timing pulse Txclk for that multiplexing and a multiplexed signal Txdata from a transmitter chip | 08-06-2009 |
20090207864 | CIRCUITRY AND METHOD FOR DETECTION OF NETWORK NODE AGING IN COMMUNICATION NETWORKS - The network node includes a local crystal oscillator for providing a time reference derived from the clock signal produced by the local crystal oscillator, a reset stage for resetting the network node in response to a bus reset pulse received through the network and a control means for issuing a bus reset pulse of a predetermined length substantially greater than a clock period of the clock signal of the local crystal oscillator. Further the network node includes a bus reset detector for determining a length of the received bus reset pulse based on the local time reference. The bus reset detector in the network node is also adapted to adjust the local time reference based on the determined length of the received bus reset pulse. | 08-20-2009 |
20090207865 | TIME SYNCHRONIZATION IN A NETWORK - A method and corresponding system for communicating between stations in a network is presented. The method includes providing repeated beacon transmissions from a coordinator station for coordinating transmissions among the stations; transmitting a signal from a first station and receiving the signal at a second station; and performing one or both of: generating the signal based on a local clock at the first station and time adjustment information in a beacon transmission received by the first station, and sampling the signal at sample times based on a local clock at the second station and time adjustment information in a beacon transmission received by the second station. | 08-20-2009 |
20090232165 | DIGITAL BROADCAST MULTIPLEXING APPARATUS - In a digital broadcast multiplexing apparatus for multiplexing a plurality of programs on a single physical channel so as to broadcast the digital multiplexed broadcasting program, there are provided with an apparatus for correcting positions of PCR packets contained in transport streams within the respective programs, and a PCR correction value forming apparatus for applying values of correcting PCR values with respect to a result of the position corrections in order to simply execute a function capable of uniformly synchronizing the PCR packets contained in the transport streams and capable of viewing the received programs without any interruption on the reception side even when a tuning operation is carried out. Then, the digital broadcast multiplexing apparatus outputs such a broadcast program packet stream which has been multiplexed as a single broadcast program in such a manner that the PCR packets are synchronized with each other among the plurality of programs. | 09-17-2009 |
20090238213 | Network synchronization system and information processing device - In a network synchronization system including plural information processing devices, a first information processing device includes a synchronization-use common storage unit configured to copy and store first information for each user authorized to use the first information processing device, so that the first information can be shared with another information processing device; and a second information processing device includes a setting information unit configured to store second information for each user authorized to use the second information processing device, and a synchronization control unit configured to compare the second information with the first information, and to update the second information to latest information based on a result of the comparison. The synchronization control unit acquires common update information common to the information processing devices, which is stored in the synchronization-use common storage unit. | 09-24-2009 |
20090238214 | TIME SYNCHRONIZATION METHOD, TIME SYNCHRONIZATION EQUIPMENT AND NETWORK COMMUNICATION SYSTEM - A time synchronization method includes the following steps. First, network communication equipment receives time information sent by at least two time servers respectively, in which the time information includes time synchronization status information of each of the time servers. Then, it is determined whether time synchronization status of each of the time servers is normal or not according to the time synchronization status information. Finally, the network communication equipment selects to employ the time information provided by the time servers with the normal time synchronization status from the at least two time servers. Network communication equipment and a network communication system are also provided correspondingly. The network communication equipment is capable of employing the time information provided by the time server with the normal time synchronization status according to the time synchronization status of each of the time servers, thereby improving precision and reliability of the time information obtained by the network communication equipment. | 09-24-2009 |
20090245290 | EFFICIENT SYNCHRONIZATION OF A SLIDING BUFFER WINDOW TO PREVENT PACKET RE-INJECTION IN AN INTERNET PROTOCOL (IP) NETWORK - An apparatus, system, and method are disclosed for efficient synchronization of a sliding buffer window to prevent packet re-injection in an IP network. The steps of the method include receiving a data packet which comprises a packet sequence number. The method initializes a replay counter, an update counter, and a circular buffer window. The circular buffer window may comprise at least one window bank and the circular buffer window may also comprise a current window bank. Furthermore, the method may include determining that the packet sequence number is greater than a maximum current bank value. In response, the method may define shifting the circular buffer window such that a current window bank position is incremented. The method may then include determining that the packet sequence number is inside the current window bank and accepting the data packet. Furthermore, a Double Compare and Swap (DCS) operation may update the bit indicator and increment the update counter and replay counter. Also, a Compare and Swap and Store (CSST) operation may increment the update counter and replay counter and set a shifted window bank. Therefore, DCS and CSST operation may still be used without having to resort to traditional locks with higher overhead. In addition, the buffer window may be an arbitrary size and is not limited to the machine architecture limit for compare and swap operations. | 10-01-2009 |
20090245291 | SYSTEM AND METHOD FOR COMMUNICATING TIMING TO A REMOTE NODE - A system and method for synchronizing a clock for data transmissions. A data packet is received at a remote node. A timing characteristic of the data packet corresponds to a tick of a clock form a reference clock. A tick of the clock is determined based on the timing characteristic of the data packet. A secondary clock is disciplined with the reference clock by adjusting the secondary clock based on a difference between times measured by the reference clock and the secondary clock to generate a clock signal. The clock signal is communicated to one or more interfaces. | 10-01-2009 |
20090257455 | Method and apparatus for synchronizing timing of signal packets - In some communications systems, unsynchronized near-end and far-end packets of communications signals can reduce or impair performance of processing of packets, such as to the case of Coded Domain Media Quality Enhancement. Therefore, a system may synchronize the incoming signals to enhance quality. A relative delay determination module according to an example embodiment of this invention determines a synchronization and relative delay between packets belonging to different packet streams arriving at a network node in a packet-based network by computing a time synchronization parameter based on a time reference of timestamps of the signals and reports the relative delay to a module making use of the relative delay such as a voice quality enhancement or an echo control module. By synchronizing the packets at the location within the network, source clocks at end or edge nodes of the network can operate with reduced synchronization, simplifying network operations and management thereof. | 10-15-2009 |
20090257456 | COORDINATED TIMING NETWORK HAVING SERVERS OF DIFFERENT CAPABILITIES - Communication and processing within a timing network that supports servers having different capabilities are facilitated. Individual servers of the network are dynamically updated without disrupting the operational characteristics of the timing network. New capabilities are not utilized between two servers until it is known that both servers are capable of supporting the new features. One server communicates to another server at an acceptable level of the another server. | 10-15-2009 |
20090257457 | METHOD AND SYSTEM FOR MAC AND PHY SYNCHRONIZATION FOR ENERGY EFFICIENT NETWORKING - Aspects of a method and system for MAC and PHY synchronization for energy efficient networking are provided. In this regard, an interface that enables communication between a MAC controller and a PHY device may be configured to operate in an energy saving mode. While the interface is operating in an energy saving mode, synchronization between the MAC controller and the PHY device may be maintained by one or both of adjusting a clock generated for the interface and/or communicating dummy data via the interface. The clock may be adjusted by one or more of adjusting a frequency of the clock, adjusting an amplitude of the clock, and/or duty cycling the clock. The MAC controller and/or the PHY device may generate the dummy data. The PHY device and/or the MAC controller may discard the dummy data upon receiving the dummy data. | 10-15-2009 |
20090257458 | CLOCK SYNCHRONIZATION SYSTEM - A clock synchronization system includes a master node; a PSN (Packet Switched Network); and a slave node configured to synchronize a recovery clock signal in the slave node with a clock signal in the master node by using packets periodically received from the master node through the PSN. The slave node includes: a buffer section having a buffer and configured to temporarily store the packets received from the master node in the buffer, to monitor and output a buffer accumulation amount, and to output data of the packets from the buffer in response to the recovery clock signal; a maximum extracting section configured to receive the buffer accumulation amount from the buffer and to extract a maximum value for each time period from the buffer accumulation amount; a control section configured to generate a control voltage such that the maximum values from the maximum extracting section are held at a reference value; and a VCO (Voltage Controlled Oscillator) configured to adjust a frequency of the recovery clock signal based on the control voltage from the control section. | 10-15-2009 |
20090262759 | COMMUNICATION - The present invention relates to communication, in particular to communication involving analogue-like signals that are multiplexed together. There is provided a method of communicating with a plurality of devices, each of which of which provides a signal whose amplitude varies in an analogue fashion, the method including the steps of: temporally interleaving the signals from the devices so as to form a multiplexed signal having a plurality of sequential pulses, which pulses can, in an analogue fashion, each have an amplitude within a continuous range, each pulse originating from a respective device, and each pulse having a plurality of temporal portions; and, forming a synchronisation signal within the multiplexed signal for demultiplexing the multiplexed signal, the synchronisation signal being formed by reducing the amplitude within a temporal portion of at least some of the pulses. | 10-22-2009 |
20090268758 | METHOD, SYSTEM AND APPARATUS FOR SYNCHRONIZING TIME IN TIME-DIVISION MULTIPLEXING SYSTEM - A method, system and apparatus for synchronizing time in a time-division multiplexing (TDM) system are disclosed. The method may include: receiving time synchronization information carried in an idle timeslot, where the idle timeslot is in a multiframe of an E1 signal or T1 signal; and synchronizing time according to the time synchronization information carried in the timeslot. The present disclosure may synchronize the time of the communication device in the TDM system while saving the cost, eliminating the necessity of installation and improving the stability of the time synchronization. | 10-29-2009 |
20090268759 | SYSTEM AND METHOD FOR DETECTING AND CORRECTING A FALSE EMBEDDED HEADER - There is provided a system and method for detecting and correcting a false embedded header. More specifically, in one embodiment, there is provided a method, comprising locating an ancillary data packet in a data stream based on a first sequence of data indicative of the ancillary data packet, determining if the ancillary data packet contains a second sequence of data indicative of sync information, and altering the second sequence of data to not indicate sync information if the ancillary data packet does contain the second sequence of data. | 10-29-2009 |
20090279572 | TRANSMISSION APPARATUS AND METHOD - A burst signal generator generates a burst signal that is a variable length portion whose length changes in accordance with fluctuations in data input at a predetermined period. An OFDM modulator generates an OFDM signal (including a guard interval portion and an effective symbol portion) that is a fixed length portion containing data corresponding to n (n is a positive integer) times or 1/n of the predetermined period. A frame includes the variable length portion and the fixed length portion. This makes a transmission signal actually have a frame period almost equal to the period of a signal synchronized with the clock of a player, including the fluctuations. | 11-12-2009 |
20090316728 | METHOD AND APPARATUS TO ENCODE AND SYNCHRONIZE A SERIAL INTERFACE - The present disclosure is generally directed to a method and apparatus to communicate data between two or more semiconductor devices. In an embodiment, a method includes synchronizing a master device with a slave device, where the master device includes a semiconductor device. Synchronizing includes transmitting a first synchronization marker data pattern via a first serial interface from the master device at a first time, and receiving a second synchronization marker data pattern via a second serial interface at the master device at a second time in response to transmitting the first synchronization marker data pattern. Synchronizing also includes determining, based at least in part on the first time and the second time, a third time when a reply is to be received by the master device in response to a request transmitted from the master device to the slave device. | 12-24-2009 |
20090323727 | SYSTEMS AND METHODS FOR SYNCHRONOUS GENERIC FRAMING PROTOCOL MAPPING - The present invention provides systems and methods for mapping synchronous input signals, such as synchronous Ethernet, into Generic Framing Protocol (GFP) frames for using GFP directly on Optical Transport Network (OTN) while preserving the synchronous timing of the input signals. The present invention defines a mapping technique for GFP-based encapsulation that preserves timing information of an incoming client signal. The mapping technique makes use of the concept that a timing signal can be fractionally multiplied in frequency using factors that are ratios of integers without creating significant timing impairments. | 12-31-2009 |
20090323728 | ASYNCHRONOUS DATA FIFO THAT PROVIDES UNINTERRUPTED DATA FLOW - An asynchronous FIFO is provided that determines whether its buffer is primed with at least one data element during a data transfer across clock domains in order to eliminate metastability issues that cause data stalls and interruptions in data flow. | 12-31-2009 |
20100002729 | SYNCHRONIZATION DEVICES AND METHODS - An exemplary embodiment of a synchronization device is provided. The synchronization device includes a memory, a demultiplexer, a comparator, and a sampling rate converter. The synchronization device has a system time clock (STC) and generates an output data with a first sampling rate. The demultiplexer receives a bit stream and extracts a packetized elementary stream (PES) from the bit stream. The demultiplexer writes the PES into the memory. The comparator obtains a presentation time stamp (PTS) from the PES and compares the PTS and the STC. The sampling rate converter has a converting factor, samples the PES in the memory, and generates the output data according to the PES. The sampling rate converter changes the converting factor according to the compared result of the comparator. | 01-07-2010 |
20100008383 | SYNCHRONIZED COMMUNICATION SYSTEM - A synchronized communication system is provided in which even when communication devices are connected in series to a transmission path, devices connected to the communication devices are synchronized so that a communication cycle can be reduced. A second communication device includes a relay path and a return path which do not pass through a storage device, and a path selection switch therefor. A first communication device instructs switching of the return path from the transmission path, measures a transmission path delay time, notifies the second communication device of it, and sends a reference time of the first communication device for each communication cycle. The second communication device corrects its reference time using the transmission path delay time and the reference time. When a new second communication device is found during synchronized communication, the first communication device also performs transmission path delay measurement using the remaining time in the communication cycle. | 01-14-2010 |
20100008384 | NETWORK EQUIPMENT - A network equipment (element) is provided with at least one SDH unit, connected to an SDH link or SONET link, extracting and outputting a first line clock synchronized with a received signal; at least one Ethernet unit, connected to an Ethernet link, extracting a second line clock synchronized with a received signal and converting the second line clock into a clock of a frequency of the first line clock to be outputted; and a timing processor receiving the clocks of the frequency of the first line clock from the SDH unit and the Ethernet unit, selecting among the clocks a clock of the best quality and outputting an equipment clock synchronized with the clock selected. | 01-14-2010 |
20100040090 | SYNCHRONIZATION METHOD FOR ALLOWING FIXED TIME DELAY AND BRIDGE EMPLOYING THE SAME - Provided are a time synchronization method allowing a fixed time delay and a bridge that is interposed between a master and a slave, according to the method. In the bridge, a predetermined time after the synchronization packet is set as an output time of the synchronization packet and the synchronization packet is output at the output time. Accordingly, it is possible to delay synchronization packets in the bridge for the same time, thereby increasing the time synchronization precision. | 02-18-2010 |
20100040091 | BLIND CHANNEL QUALITY ESTIMATOR - An embodiment is a method and apparatus to perform symbol synchronization. A sign element obtains signs of samples in a sample vector. A correlation estimator computes a correlation of the sample vector. A synchronization detector detects symbol synchronization. | 02-18-2010 |
20100054282 | METHOD AND DATA TRANSMISSION SYSTEM FOR TRANSFERRING DATA BETWEEN THE DATA TRANSMISSION SYSTEM AND A HOST PROCESSOR OF A PARTICIPANT IN A DATA TRANSMISSION SYSTEM - A method is for transferring data between a data transmission system and a processor of a participant in the data transmission system. All components of the data transmission system are synchronized to a common global time base. The operating-system time base of the participant processor is synchronized to the global time base of the data transmission system. To render possible a synchronization of the operating-system time base to the global time base in complex data transmission systems as well, it is provided that the operating-system time base of the participant processor be synchronized to the global time base of the data transmission system at least prior to a data transfer, and, to this end, that a synchronization clock pulse that is synchronous to the global time base of the data transmission system be provided for synchronizing the operating-system time base. This synchronization clock pulse is provided by a suitable arrangement that is implemented as hardware and/or software. In a data transmission system for implementing the method, the synchronization clock pulse is provided by suitable arrangement(s) of the communications controller and applied to the host processor via a synchronization line. | 03-04-2010 |
20100054283 | METHOD OF TRANSFERRING TIMING INFORMATION OVER PACKET NETWORK - Timing information is transmitted over a network by sending time-stamped packets between a transmitter and receiver. The time-stamped packets are used to compute an estimate of the frequency deviation between the transmitter clock and the receiver clock. The local receiver clock is periodically updated to match the transmitter clock based on the estimate, which is preferably a least squares estimate. A multiple window approach is employed to increase update speed. | 03-04-2010 |
20100061404 | METHOD FOR STARTING A COMMUNICATION SYSTEM, A COMMUNICATION SYSTEM HAVING A COMMUNICATION MEDIUM AND A PLURALITY OF SUBSCRIBERS CONNECTED THERETO, AND SUBSCRIBERS OF SUCH A COMMUNICATION SYSTEM - A communication system having a communication medium and at least two subscribers connected thereto is described; the communication system being designed for transmitting data among the subscribers via the communication medium in communication frames of communication cycles via a time-triggered protocol. To accelerate the start of the communication system before the actual data transmission, the communication system has a device for generating at least two different synchronization frames per communication cycle and per channel, in at least one of the subscribers, e.g., in the node AB. For example, the device is designed as two separate communication controllers per transmission channel. As an alternative, the device may also be designed as a simple logic circuit, a so-called application-specific standard product. For generating the at least two different synchronization frames per communication cycle, the subscriber is designed as an active star coupler of the communication system. Data transmission in the communication system is preferably performed using the FlexRay protocol. | 03-11-2010 |
20100061405 | SYSTEM AND METHOD FOR MONITORING SYNCHRONIZATION - A method of operating a system of devices comprises receiving content to be rendered, receiving augmentation data for controlling one or more effects devices, rendering the content at a first device, controlling the or each effects devices according to the augmentation data in synchronization with the content rendering, monitoring the synchronization of the augmentation data, and adjusting the controlling of one or more effects devices if the synchronization of the augmentation data is determined to be in doubt. | 03-11-2010 |
20100061406 | CLOCK SYNCHRONIZATION METHOD FOR USE IN COMMUNICATION SYSTEM FOR TRANSMITTING AT LEAST ONE OF VIDEO DATA AND AUDIO DATA - A source device counts a clock CLKpixel for pixel data using a transmitting counter, adds a counted value Csource(t) of the transmitting counter at a timing of transmitting a video packet Pvideo to the sink device to a header part of the video packet Pvideo as a time stamp value Csource(t), and transmits the video packet Pvideo to the sink device. The sink device receives the video packet Pvideo, extracts the time stamp value Csource(t) from the header part of the video packet Pvideo, generates a fixed reference clock CLKref based on the counted value Csource(t) of the transmitting counter using a first PLL, circuit, and generates the clock CLKpixel for the pixel data of the source device based on the reference clock CLKref using a second PLL circuit. | 03-11-2010 |
20100067553 | SYNCHRONIZATION OF VIDEO WITH TELEMETRY SIGNALS METHOD AND APPARATUS - An Ethernet-compatible synchronization process between isolated digital data streams assures synchronization by embedding an available time code from a first stream into data locations in a second stream that are known a priori to be unneeded. Successive bits of time code values, generated as a step in acquiring and digitizing analog sensor data, are inserted into least-significant-bit locations in a digitized audio stream generated along with digitized image data by a digital video process. The overwritten LSB locations are shown to have no discernable effect on audio reconstructed from the Ethernet packets. Telemetry recovery is the reverse of the embedment process, and the data streams are readily synchronized by numerical methods. | 03-18-2010 |
20100074278 | Timing Distribution Within a Network Element While Supporting Multiple Timing Domains - According to one embodiment of the invention, a network element synchronizes a number of clocks within the system while supporting multiple independent timing domains. The network element includes a local clock, which is free-running and is not necessarily synchronized with an external reference, that synchronously provides a local time value to the slave and master interfaces of each timing domain. Each slave interface of each timing domain independently determines timing information based on a received master clock synchronization event and the value of the local time when that synchronization event was received. The timing information is distributed to the master interfaces of the appropriate timing domain, and each master interface calculates an adjusted synchronization event based on the received timing information and the value of the local time when that timing information was received. The adjusted synchronization events are transmitted out of the network element to an external slave interface. | 03-25-2010 |
20100080248 | TECHNIQUES FOR TIME TRANSFER VIA SIGNAL ENCODING - Techniques for time transfer via signal encoding are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for time transfer via signal encoding comprising generating a time service ordered-set for inclusion in a physical coding sublayer frame of a physical layer device, generating time service data for inclusion in the physical coding sublayer frame of the physical layer device, and transmitting the physical coding sublayer frame. | 04-01-2010 |
20100080249 | SYSTEM, METHOD AND APPARATUS OF TIME INFORMATION SYNCHRONIZATION - A system and a method of time information synchronization as well as related apparatuses are disclosed to improve precision of frequency synchronization or time synchronization. The application port subsystem in the information synchronization system is configured to: generate at least one local clock according to a locally running real-time clock, and provide the local clock for a core subsystem; and the core subsystem is configured to: select a best system clock according to attributes of the clock provided by the application port subsystem, and send the best system clock to the application port subsystem, where: the application port subsystem calibrates the real-time clock according to the best system clock provided by the core subsystem in order to perform frequency synchronization and/or time synchronization. The embodiments of the present invention improve the precision of frequency synchronization or time synchronization effectively. | 04-01-2010 |
20100085989 | Systems and methods for packet based timing offset determination using timing adjustment information - Systems and methods for performing timing offset and or fractional frequency offset for the purpose of time and/or frequency synchronization are provided. Timing packets are exchanged between a master device and a slave device. In addition, timing adjustment information is received by the slave device. The slave device uses the timing adjustment information in conjunction with the transmit and receive times for the timing packets to estimate at timing offset and/or fractional frequency offset. | 04-08-2010 |
20100098110 | Method and Apparatus for Using Ranging Measurements in a Multimedia Home Network - According to various embodiments of the disclosure, systems, methods and apparatuses are provided for using ranging to improve network efficiency. In particular, various embodiments of the disclosure provide ranging to improve local clock time synchronization. According to one embodiment, a method for synchronizing a plurality of nodes on a communication network is provided, comprising: exchanging local clock times between a first node and a second node over the communication network; performing a ranging method between the first and second nodes based on the local clock times exchanged between the first and second nodes, wherein the ranging method results in an estimated propagation delay between the first and second nodes; and adjusting the local clock times of the first and second nodes based on the estimated propagation delay, thereby resulting in a synchronized local clock time at the first and second nodes. | 04-22-2010 |
20100103955 | POWER MANAGEMENT OF A NETWORK DEVICE - In one embodiment, a method includes receiving a synchronization command to synchronize time information among each component of a set of components in a communication path. The method includes generating a power state message. The method includes transmitting the power state message, by the first component, to the remaining components in the communication path. The power state message is configured to reduce the power consumption of the remaining components of the set of components from a first power amount to a second power amount for a time period and the time period is associated with the synchronized time information. | 04-29-2010 |
20100103956 | Synchronised control method of a plurality of formatting equipment and stream formatting equipment - The present invention relates to the domain of control methods of a plurality of formatting equipment (FE | 04-29-2010 |
20100111112 | AUTOMATED SYNCHRONIZATION OF DATA BETWEEN ELECTRICAL GRIDS - A method and system of automatically correlating data measured by monitoring devices that monitor first and second electrical grids. The second electrical grid producing alternating current signals that are electrically isolated from alternating current signals produced by the first electrical grid. An example power monitoring device includes a controller, a first monitoring device interface and a second monitoring device interface. The first monitoring device interface is coupled to a first monitoring device in the first electrical grid and the second monitoring device interface is coupled to a second monitoring device in the second electrical grid. A first counter stores data counts of occurrences from the first electrical grid. A second counter stores data counts of occurrences from the second electrical grid. A synchronization monitoring algorithm automatically synchronizes the first and second counters by associating a data count from the first counter with a data count from the second counter with a time from either the first or second grid corresponding to the occurrence of an event on either the first or the second electrical grid or both. | 05-06-2010 |
20100111113 | NETWORK ELEMENT CLOCKING ACCURACY AND STABILITY MONITORING OVER A PACKET-SWITCHED NETWORK - Various exemplary embodiments include a method and related system and monitoring entity including one or more of the following: generating timing information at a master node in a packet-switched network, the timing information specifying a value of a master clock; communicating the timing information from the master node to a plurality of slave nodes over a first plurality of time-division multiplexing (TDM) pseudowires; running a digital phase-locked loop on each slave node to synchronize each slave node to the master clock, wherein each digital phase-locked loop outputs a frequency at which the respective slave node is operating; sending the frequency outputted by each digital phase-locked loop to a monitoring entity over a second plurality of TDM pseudowires; utilizing the outputted frequencies at the monitoring entity to identify all slave nodes that are experiencing timing problems; and implementing a remedial measure for all slave nodes that are experiencing timing problems. | 05-06-2010 |
20100111114 | HIGH QUALITY TIMING DISTRIBUTION OVER DSL WITHOUT NTR SUPPORT - A method and system in which a Digital Subscriber Line Access Multiplexer (DSLAM) that is part of a DSL (Digital Subscriber Line) system is able to provide synchronous services to end user equipment connected to the DSLAM via a DSL link and Customer Premises Equipment (CPE). A sniffer device having direct or indirect access to a Primary Reference Clock (PRC) of the DSL system calculates the phase difference between the PRC and the DSLAM's Local Timing Reference (LTR). The phase difference is sent to the CPEs requiring accurate reference clock frequency. The CPEs are able to derive the PRC from the phase difference information transmitted by the sniffer device thus enabling synchronous end user equipment operation. | 05-06-2010 |
20100111115 | Node-to-node synchronizing apparatus, node-to-node synchronizing method, and computer product - A node-to-node synchronizing apparatus includes an information generating unit. Before receiving a synchronization request for synchronization, the information generating unit receives, from each process in each computing node, a mask generation request requesting to generate process location information (mask) indicating the location of processes that participate in synchronization. The information generating unit then automatically generates the process location information based on the mask generation request. | 05-06-2010 |
20100111116 | DATA TRANSMISSION METHOD, SYSTEM AND TERMINAL - Embodiments of the present invention disclose a data transmission method, a data transmission system and a CLT. The method being applicable to a semi-duplex Ethernet Passive Coaxial-cable Network and the network comprising a CLT and at least one CNU; the CLT transmitting downlink data to each CNU in a preset downlink transmission period and each CNU transmitting uplink data to the CLT in a preset uplink transmission period; the preset uplink transmission period being shorter or equal to the period that clock synchronization can be kept by the CNU. The method includes: sending, by the CLT, clock information to the CNU before the expiration of the period that the clock synchronization can be kept by the CNU, the clock information being adapted to make the clocks of the CNU and CLT be kept synchronized with each other within a period. With the embodiments of the present invention, the clock between each CNU and the CLT can be kept synchronized. Thus, the normal communication between the CNU and the CLT is guaranteed. | 05-06-2010 |
20100111117 | TRANSFERRING DATA BETWEEN ASYNCHRONOUS CLOCK DOMAINS - A device comprises an integrated circuit having first and second domains, the first domain having a first clock boundary module; and the second domain having a second clock boundary module. The first clock boundary module comprises: a buffer, for storing data for transfer to the second domain; and a first controller operable to send a first control signal to the second clock boundary module via a first synchroniser, the first control signal indicating the presence of a packet of data in a first storage location of the buffer. One of the first and second clock boundary modules comprises a multiplexer having an input connected to an output of the buffer and an output connected to circuitry forming part of the second domain. The second clock boundary module comprises: a second controller, operable in response to receiving the first control signal to control transfer of said data from the buffer by the multiplexer, and to send a second control signal to the first controller via a second synchroniser, the second control signal indicating transfer of said data. | 05-06-2010 |
20100118894 | DIFFERENTIAL TIMING TRANSFER OVER SYNCHRONOUS ETHERNET USING DIGITAL FREQUENCY GENERATORS AND CONTROL WORD SIGNALING - A method, system and master service interface transfer differential timing over a packet network. The transmitting service interface receives a service clock and is coupled to a receiving service interface through a network backplane. A primary reference clock is provided to time the network backplane. The primary reference clock and the service clock are used to synthesize a copy of the service clock connected to the transmitting service interface. A first control word containing an error differential between the service clock and the synthesized copy of the service clock is generated and transmitted through the network backplane via a packet. The first control word, together with the primary reference clock, is used to recreate the service clock for timing the receiving service interface. | 05-13-2010 |
20100118895 | Network timing synchronization systems - A method and means synchronize timing of a follower system to a reference system. A Hierarchical CFF function (“HCFF”) is applied to a set of Correction Factor Functions types (“CFFs”) or a set of other HCFF. Each CFF type uses the same input data set specific to that type and generates at least one Correction Factor Solution (“CFS”) for each of the CFF, wherein the CFS consists of only CF or the CFS consists of both i) CF and ii) a SACF. The HCFF takes as input a set of CFS and generates at least one CFS, wherein the CFS consist of only the CF, or the CFS consists of both the i) CF and ii) a SACF. | 05-13-2010 |
20100118896 | METHOD AND ANALYSIS OF SYNCHRONIZED DATA TRAFFIC OF A PACKET AND ADDRESS-ORIENTED DATA NETWORK AND CONFIGURATION OF SUCH A DATA NETWORK FOR THE IMPLEMENTATION OF THE METHOD - In a method and network for the analysis of synchronized data traffic, at least one network participant stores sent and/or received data packets in a mirror memory, and the data in the respective mirror memories are frozen and made available for evaluation via the entire data network, upon the occurrence of a trigger event in at least one of the active network participants, while maintaining the synchronized data traffic. | 05-13-2010 |
20100124240 | METHOD AND SYSTEM FOR NETWORK SYNCHRONIZATION - A method and a system for network synchronization are provided. In this method, when a node attempts to join a network, a parent node is searched from all other nodes already joined the network per specific time interval. If the parent node can be found, sync-information sent by the parent node is received by the node so as to synchronize with the parent node and enter a working mode. When a sleeping instruction sent by the parent node is received, or a timer determines that a network ending time is reached according to the sync-information, the node switches to a sleeping mode. However, when the timer determines that a network wakeup time is reached according to the sync-information, the node attempts to join the network again. All nodes in the network can work and sleep simultaneously so as to extend the lifetime of the battery. | 05-20-2010 |
20100135331 | SYSTEM AND METHOD FOR SYNCHRONIZING COMMUNICATING ENTITIES IN A DECENTRALIZED NETWORK - A method for synchronizing communicating entities in a decentralized network. The method begins with a recipient entity receiving data comprising a first timestamp and a first distance. The first timestamp being the time the first data was broadcast; the first distance being a distance from the sender's synchronization time. Next the recipient entity receives data comprising a second timestamp and a second distance. The second timestamp being the time the second data was broadcast; the second distance being a distance from the sender's synchronization time. Based on the first and second timestamps and distances, the recipient entity calculates a new synchronization time. Next, the recipient entity broadcasts to at least one entity in the decentralized network data comprising a third timestamp and a third distance. The third timestamp being the time the third data was broadcast; the third distance being a distance from the recipient entity's synchronization time. | 06-03-2010 |
20100135332 | METHOD FOR SYNCHRONIZING A CLOCK OF A NETWORK COMPONENT WITH A CLOCK OF FURTHER NETWORK COMPONENT AND NETWORK COMPONENT THEFOR - The invention relates to a method for synchronizing a clock of a network component with a clock of a further network component communicatively connected to the network component in a network and a network component, whereby the method comprises the following steps: determining a set of forward transition delays for transmission of messages from the network component to the further network component and a set of corresponding backward transition delays for transmission of messages from the further network component to the network component, selecting a minimum forward transition delay from the set of forward transition delays, selecting a minimum backward transition delay from the set of backward transition delays, deriving an estimated value for an offset between the clock of the network component and the clock of the further network component from the selected minimum forward transition delay and minimum backward transition delay, and adjusting the clock of the network component in accordance with the estimated value for the offset estimate. | 06-03-2010 |
20100135333 | PRECESION/SPEED COMPROMISE OF A SYNCHRONIZATION SIGNAL RECEPTION DEVICE - The present invention relates to a reception device able to receive packets in a communication network comprising at least two stations. The device comprises means for:
| 06-03-2010 |
20100135334 | METHOD, SYSTEM AND APPARATUS FOR SYNCHRONIZING SIGNALS - A system for synchronizing unrelated information or reference signals originating from multiple sources. The signals may be in different signal formats or subject to different delays at a receiving device. The system may include a master reference time generator connected to at least one of a plurality of slave reference signal generators via a packet network. The master reference time generator may include a master reference time counter and a sampling device for sampling the master reference time counter. The master reference time generator may encode time data in master reference time packets and feed these packets into the packet network. The slave reference signal generator(s) is adapted to accept the encoded time data as an input to generate a reference signal, the phase of which is calculated based on the time elapsed since an initial time point. | 06-03-2010 |
20100135335 | FRAME SYNCHRONIZER, FRAME SYNCHRONIZATION METHOD AND DEMODULATOR - The present invention relates to a frame synchronizer, frame synchronization method and demodulator which can more positively establish frame synchronization of an input signal which is likely to have a plurality of frame lengths. | 06-03-2010 |
20100135336 | METHOD, APPARATUS, AND SYSTEM FOR SYNCHRONIZING TIME - The present invention discloses a method, an apparatus, and a system for synchronizing time, and relates to communication technologies. The method includes: receiving a time synchronization signal which includes a One Pulse Per Second (1PPS) and an absolute time data; and sending the time synchronization signals to the client through a wired medium to synchronize time. The apparatus includes a receiving module and a sending module. The system includes a time synchronization apparatus and a client. Time synchronization is implemented through an existing wired medium between base stations to accomplish μs-level time synchronization between indoor base stations without extra cabling. | 06-03-2010 |
20100142562 | INTERFACE APPARATUS AND RESYNCHRONIZATION METHOD - An interface apparatus that transmits and receives data to and from another node coupled via a bus cable includes a port coupled to a port of the another node through the bus cable, a connection management state machine which corresponds to the port and changes the port from an active state to an inactive state when a synchronism of the port is lost, a state transition suppression circuit which generates a state transition suppression signal to suppress the change of the port from the active state to the inactive state, and a synchronization state machine that starts a resynchronization of the port in the active state based on the detection of the synchronism of the port being lost. | 06-10-2010 |
20100150180 | Algorithm for managing data loss in software demodulators - Embodiments of methods for receiving and processing multi-band signals in wideband and narrowband environments are described herein. Other embodiments may be described and claimed. | 06-17-2010 |
20100150181 | APPARTUS FOR RECEIVING T-DMB SIGNAL AND METHOD OF OPERATING THE SAME - There is provided an apparatus for receiving a T-DMB signal. The apparatus for receiving a T-DMB signal comprises an input buffer receiving and buffering a T-DMB signal comprising a null symbol and a phase reference symbol (PRS); an initial synchronizing unit estimating and compensating for time and frequency offsets of the T-DMB signal using the null symbol and the PRS; a frame tracking unit performing estimation of the time offset and measurement of a strength of an output signal from the input buffer; an OFDM signal demodulating unit performing I/Q demodulation, frequency compensation, OFDM demodulation and de-interleaving with respect to an output signal of the frame tracking unit; a channel decoding unit performing channel decoding with respect to an output signal of the OFDM signal demodulating unit and checking quality of the channel-decoded signal; and a controller controlling operations of the initial synchronizing unit, the OFDM signal demodulating unit and the channel decoding unit | 06-17-2010 |
20100158051 | Method, Apparatus and System for Frequency Synchronization Between Devices Communicating over a Packet Network - An endpoint or other communication device of a communication system includes a clock recovery module. The communication device is operative as a slave device relative to another communication device that is operative as a master device. The clock recovery module comprises a clock recovery loop configured to control a slave clock frequency of the slave device so as to synchronize the slave clock frequency with a master clock frequency of the master device. The clock recovery loop utilizes a frequency error estimator implemented as a maximum-likelihood estimator with slope fitting based on a sequence of arrival timestamps, and a loop filter implemented as a series combination of an adaptive-bandwidth filter and a proportional-integral controller. The clock recovery module may further comprise a discontinuity detector configured to detect a discontinuity in delays of respective timing messages, and a loop controller operative to place the clock recovery loop in a particular state responsive to detection of the discontinuity. | 06-24-2010 |
20100158052 | ELECTRONIC DEVICE AND METHOD FOR SYNCHRONIZING A COMMUNICATION - An electronic device is provided which comprises a plurality of processing units (IP | 06-24-2010 |
20100166020 | MLPPP SEQUENCE NUMBER SYNCHRONIZATION BETWEEN THE ACTIVE AND STANDBY TRANSMITTERS - A method and system for MLPPP sequence number synchronization between the active and standby side transmitters is disclosed. The MLPPP sequence number synchronization system includes a method for the standby side to associate transmit frame fragment numbers used by the active side to those generated by the transmitter on the standby side. The association is used to produce an offset which is used to synchronize the active and standby transmitters. The MLPPP sequence number synchronization system is particularly useful for overcoming the drawbacks of high bandwidth signaling between active and standby sides of switches known in the art. | 07-01-2010 |
20100166021 | SUBSCRIBER LINE INTERFACE CIRCUITRY WITH INTEGRATED SERIAL INTERFACES - Methods and apparatus for synchronizing communications between a first and a second device include serially communicating a frame having a first format from a first device to a second device, wherein only a frame synchronization timeslot (F1) is asserted. The serially communicated frame having the first format is sampled by the second device until the asserted F1 timeslot is detected. The second device serially communicates a frame having a second format to the first device, wherein only a frame synchronization timeslot (R1) is asserted. The serially communicated frame having the second format is sampled by the first device until the asserted R1 timeslot is detected. The first device establishes synchronization when these steps are successfully repeated. On the second sampling to detect the F1 timeslot, however, the sampling is windowed to less than one timeslot within the expected occurrence of the F1 timeslot. | 07-01-2010 |
20100166022 | SYNCHRONIZATION CONTROL DEVICE OF SLAVE DEVICES CONNECTED TO NETWORK AND METHOD THEREOF - The present disclosure relates to a synchronization control device and method of slave devices connected to a network capable of synchronizing operations of the slave devices, wherein a communication module generates a first synchronization signal and a second synchronization signal according to a distributed clock function, generating, by a processor, a control data for driving an actuator according to the first synchronization signal, outputting to a driver the control data if a synchronization interrupt is generated by the first synchronization signal, and inputting and processing, by the processor, a reception data of the communication module to generate the control data, and generating a timer interrupt on a period set up by a timer according to control of the processor, and generating, by the processor, the control data to output the generated control data to the driver if the first synchronization signal is not generated but the timer interrupt is generated. | 07-01-2010 |
20100166023 | PCR Clock Recovery in an IP Network - An IP network includes a central entity and at least one customer premises equipment (CPE) device. The central entity generates a program clock reference (PCR) clock and provides audio-visual packets to a CPE based on the PCR clock. The CPE sets a first clock based on the PCR clock for decoding operations. The CPE sets a second clock that is independent from the first clock for audio and video output operations. For example, the CPE can process the audio-visual packets using the second clock. | 07-01-2010 |
20100172379 | METHOD FOR SYNCHRONIZING A TRANSMISSION OF APPLICATIONS DATA FRAMES, CORRESPONDING SENDER AND RECEIVER DEVICES AND STORAGE MEANS - It is proposed a method for synchronizing a transmission of applications data frames provided to a sender device, the transmission being done between said sender device and at least one receiver device via a synchronous communications network implementing a clock that defines a network cycle. | 07-08-2010 |
20100177790 | TIMING RECOVERY CIRCUIT, COMMUNICATION NODE, NETWORK SYSTEM, AND ELECTRONIC DEVICE - A comparison period determiner ( | 07-15-2010 |
20100183034 | SYNCHRONIZATION OF MULTI-TIME BASE DATA SOURCES - Systems and methods are described herein that cause data from asynchronous data sources to be provided with a timestamp that corresponds to a common time base. A trigger board can be used to control synchronized data sources, and can generate timestamps when data is collected by the synchronized data sources. Unsynchronized data sources can generate data independent of the trigger board. System timestamps are generated each time data from the synchronized data source and the unsynchronized data source is received. Values of the system timestamp can be modified, and can be replaced by timestamps that correspond to the time base used by the trigger board. | 07-22-2010 |
20100183035 | METHOD, DEVICE AND SYSTEM FOR MANAGING TIMESTAMP - In an embodiment of the present disclosure, a method of managing IEEE1588 timestamps is disclosed. The method includes: receiving a data frame and a storage address of synchronized timestamp controlling information; obtaining the timestamp controlling information for the data frame to control the timestamp processing according to the storage address; obtaining a timestamp while receiving the data frame, obtaining a required timestamp according to the timestamp and adding the required timestamp into the data frame according to the timestamp controlling information; and sending the data frame added with the timestamp. A downstream timestamp managing module, an upstream timestamp managing module, and relevant timestamp managing systems are also disclosed in an embodiment of the present disclosure. The embodiment can conveniently and accurately add or obtain IEEE1588 timestamp into or from 10 Gbit/s Ethernet and simultaneously save resources and guarantee the synchronization of timestamp and data. | 07-22-2010 |
20100183036 | METHOD AND ARRANGEMENT FOR ADJUSTMENT OF A CLOCK SIGNAL - An arrangement for adjusting a clock signal in a network element of a communications network includes a processor device arranged to produce a control variable containing information about synchronization messages received from at least two other network elements. A situation in which the reception from a sending network element of synchronization messages of a good enough quality ceases will not significantly disturb the clock signal to be adjusted because only part of the control variable used for the adjustment depends on synchronization messages sent by an individual network element. In a preferred arrangement, the reference value of the control variable is changed in response to a situation where the reception from a sending network element of synchronization messages of a good enough quality ceases. Thus it is possible to reduce the change of the difference between the control variable and its reference value which further reduces disturbances caused in the clock signal to be adjusted. | 07-22-2010 |
20100195671 | SYNCHRONIZATION OF TWO COMMUNICATION NETWORKS OF AN ELECTRONIC DATA-PROCESSING SYSTEM - A method for synchronizing two communication networks of an electronic data-processing system, each of the networks including one or more respective nodes, may include establishing for each of the networks a respective time schedule that establishes at least one respective time slot for a respective synchronization message. The synchronization message time slots are established to coincide. The synchronization message of the first communication network is generated by one of the nodes of the first communication network. The synchronization message of the second communication network is generated as a function of the synchronization message of the first communication network. | 08-05-2010 |
20100195672 | DIAGNOSIS OF THE SYNCHRONIZATION OF TWO COMMUNICATIONS NETWORKS OF AN ELECTRONIC DATA-PROCESSING SYSTEM - A method for diagnosing a synchronization of two communications networks of an electronic data-processing system, each communications network including at least one node and having a respective schedule that specifies at least one respective time slot for a respective synchronization message, may include detecting, by each of the two communications networks, an individual time-based variable, comparing the two detected time-based variables to each other, and determining a quality of the synchronization of the two communications networks based on the comparison. | 08-05-2010 |
20100220747 | METHOD AND APPARATUS FOR SYNCHRONIZING NODES - During each node's awake period, each node multicasts the relative time or slot of their next awake period (beaconing interval) to all neighboring nodes. This enables each node to intelligently and independently schedule the time slot of its next transmission based on the beaconing intervals of the nodes it has heard from. During each active (awake) interval, a node builds statistics of the future transmission/receive times of its neighbors and uses them to determine its next transmission time. In one proposed implementation, at the end of an active interval, a node picks the time slot with the highest counter for its next transmission. In another proposed implementation, at the end of an active interval, a node picks one of the slots with a weighted probability; the weight of each slot is proportional with the value of the counter associated with the slot | 09-02-2010 |
20100220748 | SLAVE DEVICE, TIME SYNCHRONIZATION METHOD IN SLAVE DEVICE, MASTER DEVICE, AND ELECTRONIC EQUIPMENT SYSTEM - A slave device includes: a clock unit that is configured by a counter so as to output time information; a clock generation unit that generates clocks for counting up the counter; a message receiving unit that receives messages sent from a master device; a message sending unit that sends messages to the master device; a first calculation unit that calculates a first value necessary for correcting the time on the clock unit; a first correction unit that corrects the time on the clock unit based on the first value calculated by the first calculation unit; a second calculation unit that calculates a second value necessary for correcting a frequency of the clocks generated by the clock generation unit; and a second correction unit that corrects the frequency of the clocks generated by the clock generation unit based on the second value calculated by the second calculation unit. | 09-02-2010 |
20100220749 | METHOD AND ARRANGEMENT FOR LOCAL SYCHRONIZATION IN MASTER-SLAVE DISTRIBUTED COMMUNICATION SYSTEMS - A communication system which consists of several modules—operating in parallel on segments of a packet—to increase speed and handling capacity. One module acts as master, the others are slave modules controlled by control signals derived by the master module. It is important that in each module the data segment and the respective control signal of each packet are correctly synchronized, because in large systems the data paths carrying packet segments and the control signal paths may have substantially different delays. The invention provides for measurement of the propagation delay differences and for introducing a controlled delay in each slave module, so that data segments and control signals can be correctly correlated by delaying either the one or the other. Synchronization packets are transmitted besides normal data packets, for obtaining time stamps which are used to determine the delay difference. | 09-02-2010 |
20100238956 | Methods and systems for distributed synchronization - The invention provides a set of methods and systems for obtaining a synchronized signal in a distributed fashion. The methods and systems described herein allow a node to obtain a periodic signal that would be synchronized with the periodic signal obtained at another node when both nodes follow the same synchronizing procedure, without the need for centralized control of both nodes or the need for all nodes to have coordinated local oscillators. The invention includes beamforming methods and systems for producing a coherent beam at a target location and at a target frequency using the synchronized signal. | 09-23-2010 |
20100254411 | NETWORK SYNCHRONIZATION OVER IP NETWORKS - Network timing is derived from the PSTN and distributed through the network to gateways capable of deriving timing from the incoming UDP stream. The derived timing has the correct frequency for voice telephony without using external timing sources or extraneous hardware components. For example, a digital signal processor (DSP) can derive the timing from a timed TDM bus and distribute messages, such as IP messages, to other gateways or port networks. The other gateways and port networks use the incoming stream to extract the timing which is then used to time their TDM bus. The port networks and gateways can also distribute other streams to other gateways in a fan-out type of arrangement. This internally generated timing can be used, for example, for Circuit Emulated Services (CES). | 10-07-2010 |
20100260207 | Ranging Between Radios Using Pseudo Time of Arrival Sequence - Systems and methods for refining the determination of the time of arrival (TOA) of given data. A portion of packet data is designated to be used as a pseudo TOA sequence. The packet information is modulated using, e.g., BPSK, and thereafter spread with a chipping stream known at both source and destination radios. The resulting stream includes a TOA reference pattern. On the receive side (destination radio), receive samples are despread and demodulated. The despread data is then XOR'ed with the chipping stream to re-create the TOA reference pattern. The re-created TOA reference pattern and original receive samples (previously stored) are passed through a correlator to obtain a correlation profile, which is then used for curve fitting/interpolation to accurately determine the TOA of the given received sample. Embodiments may be used in conjunction with a radio ranging system. | 10-14-2010 |
20100260208 | System and Method for Frame Synchronization - A system and method for calculating and applying a metric that is calculated over a binary interval that corresponds in length to a preamble. The value of the metric reflects the likelihood that the interval is the preamble. A lower value for the metric suggests that the interval is more likely to be the preamble. In an embodiment, the metric is calculated beginning at an initial location in the bitstream, and then recalculated beginning at each of several successive locations in the bitstream. This results in a set of calculated metrics. The start of the preamble is considered likely to be the initial location of the interval that corresponds to the metric having the lowest value. | 10-14-2010 |
20100265968 | Synchronization Time Difference measurements in OFDM Systems - Disclosed herein are methods and devices for determining a received time difference between a first OFDM signal received from a first base station and a second OFDM signal received from a second base station. The methods and apparatus disclosed herein may be applied to 3GPP LTE systems as well as other OFDM-based wireless communication systems. An exemplary method comprises determining a decoding synchronization time for each of the first and second OFDM signals and calculating a time difference between the respective decoding synchronization times. The calculated time difference is transmitted by the mobile terminal to the first base station, the second base station, or both. Methods and apparatus for processing, at a base station, time difference information calculated according to the methods herein and transmitted to the base station by a mobile terminal are also presented. | 10-21-2010 |
20100278198 | METHOD AND APPARATUS FOR PROVIDING QUANTIZATION OF SYNCHRONIZATION SIGNALS - An apparatus for providing quantization of synchronization signals may include a processor and a memory storing executable instructions. In response to execution of the instructions by the processor, the apparatus may perform at least receiving an indication of a first variable defining a communication parameter with respect to communications associated with a serving node, receiving an indication of a second variable defining the communication parameter with respect to communications associated with a neighbor node, determining variable information based on a difference between the first variable and the second variable, and providing the variable information to the serving node in a quantized message enabling the serving node to modify a value associated with the first variable to reduce the difference between the first variable and the second variable. A corresponding method and computer program product are also provided. | 11-04-2010 |
20100290486 | A Digital Multimedia Network With Latency Control - The present invention relates to a digital multimedia network | 11-18-2010 |
20100296523 | TELECOM MULTIPLEXER FOR VARIABLE RATE COMPOSITE BIT STREAM - A multiplexer/demultiplexer (MUX/DEMUX) system for multiplexing and demultiplexing information from a plurality of traffic channels is configured according to a Plesiochronous Digital Hierarchy (PDH) standard into a composite signal transferred to and from a telecommunciations interface. A PDH traffic interface receives PDH channel signals from a plurality of PDH channels and a bit-pipe interface receives bit-pipe traffic transported as a packet data stream. A composite signal generation module and interface then creates, outputs and receives a single composite serial data stream including, in a single composite format, information from the received PDH channel signals as well as the packet data stream. The rate of the bit-pipe traffic may be adaptively modulated as a function of the composite rate. | 11-25-2010 |
20100303100 | Method and System for Synchronizing a Group of End-Terminals - A method is described for synchronizing the transmission of a stream to a group of end-terminals. The method is used in a system comprising a station transmitting a packetized stream over a network to at least a first and second network node. Each network node comprises a variable delay unit and each network node is connected to one or more end-terminals. In the method the synchronization unit receives arrival time information of a packet in the broadcast stream at the first and second network node. Delay information is calculated for the first and second network node on the basis of the arrival time information of the packet. Further, the delay information is transmitted to the first and second network node so that the variable delay unit in the first and second network node is able to transmit the broadcast stream to the first and second end-terminal in a substantially synchronized way. | 12-02-2010 |
20100309932 | METHOD AND SYSTEM FOR COMPENSATED TIME STAMPING FOR TIME-SENSITIVE NETWORK COMMUNICATIONS - Aspects of a method and system for compensated time stamping for time-sensitive network communications are provided. In this regard, one or more timestamps generated in an OSI layer above the physical layer may be adjusted based on parameters associated with an amount of time in which data traverses a PHY of the network device. Communications of the network device may be managed based on the adjusted one or more timestamps. The parameters may comprise one or more of: average ingress PHY traversal time, average egress PHY traversal time, variance of ingress PHY traversal time, and variance of egress PHY traversal time. One or more network links coupled to the network device may be characterized based on the one or more adjusted timestamps. The parameters may be stored in one or more registers within a PHY of the network device. | 12-09-2010 |
20100309933 | METHOD FOR SYNCHRONIZING DATA MAINTAINED AT A PLURALITY OF NODES - A method for synchronizing data maintained at a plurality of data objects. The method involves assembling source and destination trees, each of the source and destination trees including a root node and one or more dependent nodes associated with source and destination data maintained at the plurality of data objects respectively. After the trees are assembled, a checksum calculation is performed for the nodes of the source tree and the destination tree based on the associated source data and the associated destination data maintained at the plurality of data objects respectively. The destination tree and the destination data are synchronized with the source tree and source data based on the comparison of the checksum calculations of corresponding nodes in the source tree and the destination tree. Missing nodes or nodes having mismatching checksums in the destination tree are identified and either added or modified to match the corresponding node or nodes in the source tree, while the data in the source data objects are fetched and copied by the destination data object corresponding to the added and/or modified nodes in the destination tree. | 12-09-2010 |
20100316069 | Network Clock Synchronization Floating Window and Window Delineation - A network component comprising at least one processor configured to implement a method comprising initiating a synchronization window, and promoting the transmission of a frame comprising a control symbol, wherein the control symbol delineates a beginning of the frame, and wherein the control symbol is offset from the beginning of the synchronization window. Also disclosed is a system comprising an upstream node in communication with a downstream node, wherein the upstream node transmits a data stream comprising a plurality of frames to the downstream node, wherein the data stream is organized into a plurality of synchronization windows, and wherein the frames float within the synchronization windows. Included is a method comprising transmitting an Ethernet data stream comprising an Ethernet control symbol, wherein the Ethernet control symbol is transmitted within a synchronization window and delineates a start of a packet within the synchronization window. | 12-16-2010 |
20100322267 | TIME SYNCHRONIZATION SYSTEM AND TIME SYNCHRONIZATION METHOD IN TRAIN - An inter-vehicle network that connects monitoring and control devices communicating with an intra-vehicle network that couples in-vehicle devices with the monitoring and control devices. A train clock station at an uppermost level in a hierarchical structure and a vehicle clock station in a middle level in a hierarchical structure are established from the monitoring and control devices. Other devices are established as a correction information waiting station at a lowermost level in the hierarchical structure. The train clock station performs a time correction of its own station with time information that is arbitrarily obtained as reference time. The vehicle clock station performs a time correction of its own station based on a message transmitted from the train clock station. The correction information waiting station performs a time correction of its own station based on a message transmitted from the vehicle clock station. | 12-23-2010 |
20100329284 | CENTRALIZED NODE CLOCK AUTO RECONFIGURATION - The invention is directed to a method and system for providing centralized automated synchronization clock reconfiguration in packet switched telecommunications networks having network nodes that do not implement Synchronization Status Messaging (SSM) internally. This is especially useful when integrating TDM networks with packet switching network elements having T1 and E1 interfaces. | 12-30-2010 |
20100329285 | MECHANISM FOR CLOCK SYNCHRONIZATION - A method and apparatus for synchronizing time between a master device and a target device arranged across a network, wherein the target device communicates to the master device through a PCIe interconnect includes transmitting a first message at a first time from the master device to the target device, the first message including a message indicator; and receiving a reply message at a subsequent time from the target device to the master device, the reply message including the message indicator. | 12-30-2010 |
20100329286 | METHOD AND RECEIVING UNIT FOR SYNCHRONIZING A PACKET-ORIENTED RECEPTION WITH A CALCULATED TONE SIGNAL - In addition to the transmission of a tone signal (ts) according to the RFC standard 2833 via a network using Internet protocol, the tone signal is transmitted in the data packets (dp). Subsequently, the phase difference (Δφ) between the transmitted tone signal (ts) and the generated tone signal (ts′) is ascertained, before beginning the insertion of the generated tone signal (ts′) in the data packets (dp), and compared to a predetermined phase difference (φv). If the ascertained phase difference exceeds the predetermined phase difference (Δφ,φv), the phase of the generated tone signal (ts′) is changed by a predetermined phase (φ) with the aid of the tone generator (TG). The ascertainment of the phase differences (Δφ) and the change of the phase (φ) of the generated tone signal (ts′) is repeated until the ascertained phase difference is less than the predetermined phase difference (Δφ,φv), upon which instead of the transmitted tone signal (ts), the generated tone signal (ts) is inserted into the data packets (dp). A substantial advantage of the invention can be seen in that a phase detector does not have to be continuously active for the synchronization, but rather the synchronization must only be performed if a tone signal (ts) or tone information (ti) is received and the insertion of the generated tone signal (ts′) is imminent. | 12-30-2010 |
20110013650 | PSEUDO-SYNCHRONOUS TIME DIVISION MULTIPLEXING - Methods and apparatuses to multiplex logic data pseudo synchronously are described. A representation of a multiplexer logic is generated to transmit data items asynchronously relative to a design clock. The data items may be transmitted under control of a transmission clock from a first integrated circuit to a second integrated circuit. A representation of a counter logic may be generated to couple with the multiplexer logic for transmitting the data asynchronously. Additionally, a representation of reset logic may be generated for a configuration to repeatedly reset the counter logic. Synchronization signals may be generated for a design clock cycle of a design clock driving the data items. The synchronization signals may be transmitted via the transmission clock asynchronous with the design clock. The data items may be transmitted via a number of transmission slots determined based on the clock cycles of the transmission clock and the design clock The total time for the transmission slots for transmitting the logic data may be less than the clock cycle of the design clock. One or more transmission slots within the clock cycle of the design clock may be used to transmit the synchronization data to indicate a new cycle to transmit the data items according to the design clock. | 01-20-2011 |
20110038388 | COMMUNICATION SYSTEM INCLUDING A DATA BUS AND MULTIPLE USER NODES CONNECTED THERETO, AND METHOD FOR OPERATING SUCH A COMMUNICATION SYSTEM - A communication system is described that includes a data bus and multiple user nodes connected to the data bus. Also described is a method for operating such a communication system. Data frames for data transmission each include a data field and/or a control field and a check sum field. One user has a high-precision clock generator (for example, precise quartz, MEMS resonator, etc.), and the remaining users have a clock generator (for example, an RC oscillator or imprecise quartz) having a lower precision. During operation of the communication system calibration messages are present on the data bus, and the users having the imprecise clock generator receive a calibration message. The users having the imprecise clock generator calibrate the imprecise clock generator to a system clock signal of the data bus, taking into account information contained in the received calibration message. To expedite the calibration of such a communication system and at the same time conserve bandwidth on the data bus, any given messages transmitted via the data bus are used as calibration messages for calibrating the system. For the calibration, a distance (NOPN) between an edge in the data field or in the control field of a received data frame and another edge in a field of the received data frame is measured in oscillator periods. The number (NB) of bits between these two edges is counted, and a clock divider which generates a system clock signal of a data bus protocol control system of the user to be calibrated is to be set so that a system clock signal period has a length of NOPN/NB·NTQ oscillator periods. | 02-17-2011 |
20110051752 | method for clock link automatic protection in packet transport networks - A method for clock link automatic protection in packet transport networks is disclosed. The method includes that: extending the clock synchronization status message to allow said clock synchronization status message to include: a clock identification (ID), a quality grade of clock, the number of network elements that the clock has passed, a clock alarm indication, and a forbidden-use indication; each network element in the clock link processes the clock synchronization status message; and said each network element selected a clock source according to the clock synchronization status message. The method in the present invention allows the network elements to be able to automatically select the optimal routing clock, forbid non-optimal routing clocks to participate in the selection, and effectively prevent the clocks from looping. | 03-03-2011 |
20110051753 | WIDEBAND CABLE SYSTEM - A wideband cable modem system increases available bandwidth of a single channel by encoding a data stream into wideband packets. The wideband packets are associated with a logical wideband channel that extends over multiple physical downstream cable channels. | 03-03-2011 |
20110051754 | MEASUREMENT AND ADJUSTMENT OF REAL-TIME VALUES ACCORDING TO RESIDENCE TIME IN NETWORKING EQUIPMENT WITHOUT ACCESS TO REAL TIME - A system and method of synchronizing clocks in a distributed network is disclosed. A simple 1-pulse-per-second timing pulse is routed to time-stamping units in each network device and utilized to measure traffic-dependent synchronization packet residence delays within network elements. Synchronization messages are updated to reflect the measured residence times, thus creating transparent clocks that can readily be synchronized across the network. The simple timing pulse architecture allows the method to be applied readily both to new designs and to retrofit existing hardware. | 03-03-2011 |
20110069721 | Packet Flow Side Channel - A packet flow side channel encoder and decoder embeds and extracts a side channel communication in an overt communication data stream transmitted over a network. The encoder selects more than one group of related packets being transmitted on the network, relates a packet of one group to a packet of another group to form a pair of packets; and delays the timing of at least one packet from each pair of packets The decoder determines inter-packet delays that are the difference in timing between two packets in a pair of packets; determines at least one inter-packet delay difference between two or more determined inter-packet delays; and extracts a bit using the at least one interpacket delay difference. | 03-24-2011 |
20110075685 | METHOD, APPARATUS, AND SYSTEM FOR TIME SYNCHRONIZATION - A method, apparatus, and system for time synchronization are disclosed. The method comprising: obtaining a master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and a master receiving time stamp; and adjusting the time of the slave clock according to the offset calculated from the time stamps to synchronize with the clock time of the master clock. With the present invention, in passband transmission systems that transmit signals continuously in units of symbols, the time synchronization is implemented between the master clock and the slave clock. | 03-31-2011 |
20110090925 | METHOD FOR SYNCHRONIZATION IN NETWORKS - The invention relates to a method for synchronization in networks, whereby the local time (h | 04-21-2011 |
20110103407 | Network Traffic Synchronization Mechanism - Methods, apparatuses and systems directed to a network traffic synchronization mechanism facilitating the deployment of network devices in redundant network topologies. In certain embodiments, when a first network device directly receives network traffic, it copies the network traffic and transmits it to at least one partner network device. The partner network device processes the copied network traffic, just as if it had received it directly, but, in one embodiment, discards the traffic before forwarding it on to its destination. In one embodiment, the partner network devices are operative to exchange directly received network traffic. As a result, the present invention provides enhanced reliability and seamless failover. Each unit, for example, is ready at any time to take over for the other unit should a failure occur. As discussed below, the network traffic synchronization mechanism can be applied to a variety of network devices, such as firewalls, gateways, network routers, and bandwidth management devices. | 05-05-2011 |
20110142077 | NETWORK SYNC PLANNING AND FAILURE SIMULATIONS - The invention is directed to a method and system for providing synchronization clock performance simulation in a timing-over-packet network having a network management system. The system retrieves information from nodes in a network and determines a timing-over-packet topology in a simulated model of the network, and determines clock stability statistics. The system further accepts simulation inputs such as addition or deletion of nodes in the simulated network, or introduction of failures into in the simulated network. The system provides predicted clock stability performance of an existing network under various simulated conditions without requiring modifications or introduction of failures to the existing network which would be useful for network optimization and network planning. | 06-16-2011 |
20110142078 | NETWORK TIMING TOPOLOGY VIA NETWORK MANAGER - The invention is directed to providing a method and system for monitoring and managing from a network management entity, timing-over-packet synchronization performance in a packet switching network having multiple network nodes. The network management entity determines a physical topology and a synchronization topology of the network and monitors synchronization performance by collecting virtual path information. | 06-16-2011 |
20110142079 | NETWORK IMPAIRMENT METRICS FOR TIMING OVER PACKET - The invention is directed to providing a system and method for monitoring a clock synchronization metric in a timing-over-packet system to provide a metric for service-level agreements (SLA), by providing a measure of the stability of the packet transfer delay relative to a representative statistic such as a median or minimum. | 06-16-2011 |
20110142080 | METHOD AND SYSTEM FOR ENERGY EFFICIENT SYNCHRONIZATION IN PACKET BASED NETWORKS - Aspects of a method and system for energy efficiency synchronization packet based networks are provided. In this regard, an amount that a clock of a network device drifts between consecutive communications of one or more synchronization packets may be determined, and transitions of the network device into and/or out-of an energy-saving mode of operation may be controlled based on the determination. Additionally or alternatively, the transitions may be controlled based on a number of times that synchronization packets are communicated between the network device and a link partner. An average difference between the clock of the network device and a reference clock may be calculated, and the transitions may be controlled based on the calculated average. | 06-16-2011 |
20110150005 | Network Slave Node and Time Synchronization Method in Network Applying the Same - Provided are a network slave node and a time synchronization method using precision time protocol-like (PTP-like) in a network. The network slave node includes a packet detection unit for detecting whether the slave node receives or sends a synchronization protocol packet and recording a synchronization protocol packet receiving time and a synchronization protocol packet sending time; a hardware clock; and a control unit controlling the packet detection unit and the hardware clock. The control unit reads out the packet receiving time and the packet sending time from the packet detection unit and informs a local master node. The local master node calculates a time offset between the local master node and the slave node, and informs the control unit. The control unit adjusts the hardware clock based on the time offset so that the local master node and the slave node are time synchronized. | 06-23-2011 |
20110150006 | DE-ENCAPSULATION OF DATA STREAMS INTO MULTIPLE LINKS - Embodiments of the invention are generally directed to de-encapsulation of data streams into multiple links. An embodiment of a method includes receiving a data stream including multiple data frames, the data stream being in a first mode having a multiple channels of content data including a first channel sent in a first position in each data frame and a second channel sent in a second position in each data frame following the first position, with each data frame including a synchronization signal to indicate a start of the content data. The method further includes transforming the data stream into data sub-streams in a second mode, the data sub-streams including a first data sub-stream to carry data for the first channel in the second mode and a second data sub-stream to carry data for the second channel in the second mode. Transforming the data stream into in the plurality of data sub-streams includes generating the first data sub-stream by stripping the second channel from each frame of data, and generating the second data sub-stream by stripping the first channel and the synchronization signal from each frame and inserting a substitute synchronization signal before the second channel data in each data frame. The method further includes transmitting the first data sub-stream via a first link in the second mode and the second data sub-stream via a second link in the second mode. | 06-23-2011 |
20110150007 | CLOCK OPERATING METHOD AND APPARATUS FOR SUPPORTING ETHERNET PHYSICAL LAYER INTERFACES - Provided is a clock operating method and apparatus for supporting a plurality of Ethernet physical layer interfaces. To provide a network synchronization function in a board of simultaneously accommodating the plurality of Ethernet physical layer interfaces, the clock operating method may include: determining a physical layer interface according to a current network synchronization mode; and generating a clock signal of the determined physical layer interface as a reference signal of another physical layer interface. | 06-23-2011 |
20110150008 | AUTOMATIC MANAGEMENT OF TIMESTAMP-BASED SYNCHRONISATION PROTOCOLS - A method for automatic management of a timestamp-based synchronization protocol within a packet-based network to synchronize a slave within a synchronization topology including a plurality of masters, the slave clock being locked to a master clock at an initialization time, said method comprising an assessment step of end-to-end packet delay variation on the basis of the slave clock accuracy, over a plurality of (slave, path, master) combinations, each path linking the slave to a master. | 06-23-2011 |
20110158260 | CROSS-SCOPE SYNCHRONIZATION OF DATA ITEM KNOWLEDGE AND CORRESPONDING METADATA - The subject disclosure relates to cross scope synchronization among different sets of nodes that synchronize the same data item(s) according to different synchronization scopes. In one aspect, create and update versions are defined for a scope in which a data item was created and updated, respectively, and create and update versions are defined for a local node shared for different groups of nodes synchronizing according to the different synchronization scopes (e.g., a server node). | 06-30-2011 |
20110158261 | SERIAL BUS DEVICE AND CLOCK DIFFERENCE COMPENSATION METHOD THEREOF - A serial bus device for transmitting a packet to a link partner is provided. The serial bus device includes a processing unit and a clock difference compensation unit coupled to the processing unit. The processing unit generates the packet. The clock difference compensation unit determines whether to transmit at least one skip ordered set to the link partner prior to the packet according to a type of the packet, so as to compensate for a clock difference for the link partner. | 06-30-2011 |
20110158262 | ALLOCATION ADJUSTMENT IN NETWORK DOMAINS - A network node in a resource reservation network includes a data receiver, a transmitter and a timing adjustment requester. The data receiver receives fixed size application protocol data units (APDUs) from an application at fixed intervals. The transmitter transmits data from the network node to the network within transmission opportunities (TXOPs) associated with a constant data service flow for the application specified associated with the application and the network node in a media access plan (MAP) generated by a network scheduler. The timing adjustment requester requests adjustments of the network scheduler to the timing of TXOPs associated with the constant data service flow in order to minimize a delay between the arrival of the APDUs and their transmittal to the network. | 06-30-2011 |
20110158263 | TRANSIT TIME FIXATION DEVICE - A transit time fixation device and a control method of the same is provided which can constantly fix transmission delay time in relation to synchronous frames, and allows a high accuracy sampling synchronization control. The frame | 06-30-2011 |
20110164627 | THREE-STAGE ARCHITECTURE FOR ADAPTIVE CLOCK RECOVERY - An adaptive clock recovery (ACR) system has a first closed-loop control processor (e.g., a first proportional-integral (PI) processor) that processes an input phase signal indicative of jittery packet arrival times to generate a mean phase reference. The input phase signal is compared to the mean phase reference to generate delay-offset values that are indicative of the delay-floor corresponding to the packet arrival times. The mean phase reference and the delay-offset values are used to generate offset-compensated phase values corresponding to the delay-floor. The ACR system also has a second closed-loop control processor (e.g., a second PI processor) that smoothes the offset-compensated phase values to generate an output phase signal that can be used to generate a relatively phase stable recovered clock signal, even during periods of varying network load that adversely affect the uniformity of the packet arrival times. | 07-07-2011 |
20110164628 | RECEPTION APPARATUS AND METHOD, PROGRAM AND RECEPTION SYSTEM - Disclosed herein is a reception apparatus, including: a reception section configured to receive an OFDM (orthogonal frequency division multiplexed) signal obtained by modulating a common packet sequence configured from a packet common to a plurality of streams and a data packet sequence configured from packets individually unique to the plural streams; a buffer configured to accumulate packets of the common packet sequence and the data packet sequence obtained by demodulating the received OFDM signal; a retaining section configured to retain correction information for correcting out-of-synchronism between the common packet sequence and the data packet sequence obtained from particular packets of the common packet sequence and the data packet sequence upon reading out of the packets accumulated in the buffer; and a correction section configured to correct the out-of-synchronism of the packet which suffers from the out-of-synchronism of the packets based on the correction information retained in the retaining section. | 07-07-2011 |
20110164629 | METHOD FOR DATA TRANSMISSION VIA DATA NETWORKS - A method for data transmission via data networks, in particular via ethernet-based data networks, having at least two participants; the data networks have at least one topological real-time field and one topological non-real-time field, and data telegrams sent via the data networks have at least one real-time part and at least one non-real-time part. By a coupling unit, data telegrams from the non-real-time field which arrive inside the real-time part are delayed and transmitted to the non-real-time part. | 07-07-2011 |
20110188520 | Method for operating a time-controlled bus system - In a method for operating a time-controlled bus system, which communicates in communication slots in a sequence of communication cycles, a processing instruction, which is automatically generated from input data and configuration data, is used for processing communication tasks on the basis of time signals, the input data containing identifiers to identify the communication tasks, cycle information to assign the communication tasks to at least one communication cycle, and time position information to terminate the communication tasks within at least one communication cycle, and the configuration data contain data which define the communication tasks and/or describe the bus system. | 08-04-2011 |
20110200060 | Feedforward Synchronization in Asynchronous Packet Networks - To perform timing synchronization in an asynchronous packet network, remote timestamps representative of a transmitter clock at a transmitter are received over a packet network. These are compared with local timestamps representative of the timing of a local oscillator at the receiver to produce an estimate of the offset between the transmitter clock and the local oscillator at the receiver. This estimate is then used to generate update values for a digital controlled oscillator producing the output clock at the receiver. The system operates in a feedforward configuration wherein the local oscillator at the receiver serves as one input to the offset estimator. | 08-18-2011 |
20110211596 | SYSTEMS AND METHODS FOR SYNCHRONIZING FILTER RECORDS - Systems and methods for synchronizing filter records between a mobile device and a network node are described herein. Upon detection of a precedence contention when installing filters at the network node, a synchronization command can be initiated to synchronize the filter records between the mobile device and the network node. | 09-01-2011 |
20110211597 | Network synchronization system and information processing device - In a network synchronization system including plural information processing devices, a first information processing device includes a synchronization-use common storage unit configured to copy and store first information for each user authorized to use the first information processing device, so that the first information can be shared with another information processing device; and a second information processing device includes a setting information unit configured to store second information for each user authorized to use the second information processing device, and a synchronization control unit configured to compare the second information with the first information, and to update the second information to latest information based on a result of the comparison. The synchronization control unit acquires common update information common to the information processing devices, which is stored in the synchronization-use common storage unit. | 09-01-2011 |
20110216787 | METHOD AND APPARATUS OF SYNCHRONIZATION SCHEDULING - A method and apparatus for synchronization scheduling are disclosed in the present invention, wherein the method for synchronization scheduling includes that: lower layer network element(s) obtaining multiple synchronization sequences of a designated service from an upper layer network element to which the lower layer network element(s) belongs, wherein the upper layer network element processes data packets of the designated service according to a synchronization sequence length, and transmits the multiple synchronization sequences to the lower layer network element(s), wherein the synchronization sequences are a set of data packets with the same timestamp information; the lower layer network element(s) determining a scheduling transmission time interval according to the synchronization sequence length and time division multiplexing period of the designated service, wherein the scheduling transmission time interval is a common multiple of the time division multiplexing period and the synchronization sequence length, and the time division multiplexing period of the designated service is 1/n time of the period of a wireless interface connection frame number, n is an integer; and as for a synchronization sequence whose timestamp locates in a current scheduling transmission time interval, the lower layer network element(s) transmitting it in an available transmission period of a designated scheduling transmission time interval. The present invention can avoid the loss of service data. | 09-08-2011 |
20110222560 | PHYSICAL LAYER TRANSCEIVER WITH INTEGRATED TIME SYNCHRONIZATION - Disclosed, inter alia, is a Physical Layer Transceiver (PHY) with integrated time synchronization, such as, but not limited to, IEEE 1588 Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems. The PHY includes circuitry to maintain a current time, and to trigger the storage of timestamps corresponding to received frames. Typically, in response to a request from an external device, the timestamps are retrieved from storage and are communicated to the external device. By moving the triggering of the storage of the timestamps by the PHY itself, rather than by a monitoring of the traffic between the PHY and the Media Access Controller (MAC), higher accuracy can typically be achieved | 09-15-2011 |
20110222561 | SYSTEMS AND METHODS FOR PROVIDING TIME SYNCHRONIZATION - Systems and methods for providing time synchronization in a local network are provided. A time source may be configured to determine a current time and a designated time at which a reference signal will be output, and to output the reference signal when the designated time is reached. A network host communicatively coupled to the time source may be configured to (i) identify the designated time and (ii) communicate the identified designated time to one or more network devices via a local network. The one or more network devices may be respectively configured to (i) initiate an internal clock, (ii) receive the designated time from the network host, (iii) receive the reference signal output be the time source subsequent to receiving the designated time, and (iv) set a value of the internal clock to the designated time upon receipt of the reference signal. | 09-15-2011 |
20110235657 | Multimode Apparatus and Method - A method and apparatus are herein provided to align media access control (MAC) cycles of networks of different medium types. Information is obtained that indicates a timing information of a first MAC cycle in a first network of a first medium type and a second MAC cycle in a second network of a second medium type. A buffer is provided for storing the timing information. Alignment information is derived based on the timing information of the first/second network that enables alignment of the MAC cycles between the first and second networks. A controller unit is provided for deriving the alignment information. | 09-29-2011 |
20110249688 | Maintaining Time of Day Synchronization - A technique for maintaining time synchronization between network nodes involves broadcasting a timing signal from a source node to its neighbors. The timing signal is transmitted in a dedicated source time slot of a super epoch comprising a number of epochs each having a number of time slots. A reply timing signal is received at the source node from a neighboring node designated as the destination node, where the reply timing signal is received in a dedicated destination time slot of the super epoch. The clock drift and propagation delay between the source and destination nodes are computed at the source node. At the neighboring nodes other than the destination node, clock drift can be computed using previous estimates of propagation delay. RTS and CTS exchanges from PTP packets can also be used to estimate the propagation delay in the source node and the clock drift in the destination node. | 10-13-2011 |
20110255560 | TRANSMISSION OVER AN 12C BUS - A method and a system of multichannel transmission over a twin-wire bus including a data signal and a synchronization signal, data of a first channel being transmitted by a state coding of the data signal for a time period containing a first state of the synchronization signal, data of a second channel being transmitted by pulse coding outside of said period. | 10-20-2011 |
20110261842 | METHOD AND APPARATUS FOR RESILIENT CLOCK TRANSFER OVER MULTIPLE DSL LINES - A system and method for transmitting and recovering external clock signals over links of a DSL system in which the external clock signals are used to synchronize transmitted physical layer signals from a CO of a DSL system and said external clock signals are derived from the received physical layer signals at an RT/CPE location of a DSL system. A clock recovery sub-system located at both the CO and the RT/CPE comprises a clock monitor circuit in communication with a Phase Lock Loop circuit. The clock monitor circuit at the RT/CPE is able to derive clock signals from the received physical layer signals and select one of said derived clocks to which a local reference clock at the RT/CPE is synchronized. The synchronized local reference clock, which can exist even when there are no valid derived clocks, may be used to transmit pseudowire frames (e.g., TDM data over Ethernet). | 10-27-2011 |
20110268139 | SYNCHRONIZING NODES OF A MULTI-HOP NETWORK - A method for synchronizing nodes of a multi-hop network with a Time Division Multiplex Access scheme (TDMA), the nodes being hierarchically arranged in different levels, including a step of organizing the TDMA by periodic superframes, the respective superframe having a number of frames including at least a broadcast frame, a step of providing the respective broadcast frame with a number of slots, the number of slots being equal to a number of parent nodes in the multi-hop network, a step of assigning each parent node one slot in the broadcast frame in dependence on its level, and a step of distributing a synchronization information to the parent nodes by means of the broadcast frame, respectively. | 11-03-2011 |
20110274124 | Method and Device for Packet Network Synchronization - A method is described for synchronizing a clock of a client ( | 11-10-2011 |
20110305247 | METHOD FOR SYNCHRONIZING CLOCKS BY SEPARATED TRANSMISSIONS OF FIRST AND SECOND DATA VIA AT LEAST ONE TIMING DISTRIBUTION PROTOCOL, AND ASSOCIATED SYSTEM AND MODULE - A method is intended for synchronizing a client clock of a client communication node with a master clock in a data packet network. This method comprises the steps of: i) transmitting first data representative of timing information of the master clock from a source communication node to the client communication node via a time distribution protocol, ii) transmitting second data representative of a frequency reference correlated to the timing information from a chosen communication node to the client communication node via a time distribution protocol, and iii) differentiating the transmitted first and/or second data into the client communication node to synchronize the client clock with the master clock by means of the timing information and/or frequency reference represented by the differentiated first and second data. | 12-15-2011 |
20110305248 | CLOCK SELECTION FOR SYNCHRONOUS ETHERNET - An Ethernet PHY may receive an indication from a local timing source that a local clock is suitable for propagation to a link partner. In response, a timer in the Ethernet PHY may be started. In instances that the Ethernet PHY receives, during a time period subsequent to starting the timer and before the timer reaches a predetermined value, an indication that the link partner is propagating a clock that is suitable for the Ethernet PHY to synchronize to, the Ethernet PHY may be configured as timing slave. In instances that the Ethernet PHY does not receive, during the time period subsequent to starting the timer and before the timer reaches a predetermined value, an indication that the link partner is propagating a clock that is suitable for the Ethernet PHY to synchronize to, Ethernet PHY may be configured as timing master upon the timer reaching the predetermined value. | 12-15-2011 |
20110317724 | Communication device, packet synchronization method - A communication device is provided, with which packet synchronization is achieved based on input data transmitted by an external device, without using a special protocol between the communication device and the external device. An external TE attaches a CRC code to each packet before transferring data to a mobile terminal (UE). Data is bulk transferred from the external TE to the UE according to a USB protocol. At the UE, the CRC code of the input data is detected at a CRC processing unit | 12-29-2011 |
20120002684 | DMR Private Network Communication Implementation Method, Terminal, Relay Station and System - The present invention relates to a private network communication technology, and it provides an implementation method, terminal, relay station and system for DMR private communication with respect to the existing defects that each of the communication terminals can only communicate with each other by using the same time slot in a group, and thereby a frequency width of 12.5 KHz can not be used sufficiently. The DMR private network communication terminal includes a communication module for receiving CACH information, receiving and transmitting DMR private network communication, a synchronization module for establishing synchronization and determining which time slot the received DMR private network communication occupies based on the received CACH information; and controlling the communication module to make a response for the received DMR private network communication in the time slot. The present invention further provides an implementation method, relay station and system for DMR private network communication. Each path of DMR private network communication only occupies one time slot, the case of occupying different time slots at different time can be avoided. In this case, the stability of the idle time slot can be ensured, and other DMR private network communication terminals can initiate new DMR private network communication by locking unoccupied idle time slot; thereby achieving a full usage of the frequency width of 12.5 KHz. | 01-05-2012 |
20120020376 | Apparatus, method, and system for synchronizing time - The present invention relates to an apparatus, method and system for synchronizing time. The method includes: extracting line clock frequency information from an input line code stream, and extracting a time synchronization packet from a packet stream corresponding to the input line code stream; sending the input line code stream after extracting the line clock frequency information and the time synchronization packet to a packet switching device; receiving an output line code stream sent by the packet switching device; and calibrating local time according to the line clock frequency information and the time synchronization packet, recovering line clock frequency information of the output line code stream according to the calibrated local time, and inserting a time synchronization response packet into a packet stream corresponding to the output line code stream. In this way, the time synchronization network may be deployed without requiring the packet switching device to support time synchronization. | 01-26-2012 |
20120027030 | NETWORK TERMINAL, NETWORK SYSTEM, TIME SYNCHRONIZATION METHOD, AND TIME SYNCHRONIZATION PROGRAM - A network terminal has communication section that communicates with other network terminals connected via a network, time-series data creation section that, at timing set beforehand, creates time information including a correspondence between an identification number of the own network terminal and a current time measured by a timer of the own network terminal and creates time-series data registering the time information, and additional registration section that, when the communication section receives the time-series data transmitted from another network terminal, creates time information including a correspondence between the identification number of the own network terminal and a current time measured by the timer of the own network terminal and additionally registers the time information to the time-series data received this time. | 02-02-2012 |
20120033684 | TDMA COMMUNICATION USING A CSMA CHIPSET - A technique for communicating information using an electronic device that includes an IEEE 802.11-compliant chipset is described. This communication technique facilitates transmission of data packets in IEEE 802.11 frames in a communication channel by the IEEE 802.11-compliant chipset using time division multiple access (TDMA). In particular, the electronic device may queue a data packet in a software queue. Based on available space in a hardware queue in the IEEE 802.11-compliant chipset, this data packet may be provided to the hardware queue for inclusion in an IEEE 802.11 frame that is compliant with an IEEE 802.11 communication protocol. Then, the electronic device provides time-slot control information to the IEEE 802.11-compliant chipset based on a timing-synchronization signal. In this way, the electronic device gates the release of the data packet from the hardware queue for transmission in the IEEE 802.11 frame by the IEEE 802.11-compliant chipset. | 02-09-2012 |
20120063472 | METHOD FOR PROCESSING DISTRIBUTED DATA HAVING A CHOSEN TYPE FOR SYNCHRONIZING COMMUNICATION NODES OF A DATA PACKET NETWORK, AND ASSOCIATED DEVICE - A method is intended for processing distributed data of a chosen type in a data packet network comprising communication nodes (N | 03-15-2012 |
20120063473 | HIGH QUALITY TIMING DISTRIBUTION OVER DSL WITHOUT NTR SUPPORT - A method and system in which a Digital Subscriber Line Access Multiplexer (DSLAM) that is part of a DSL (Digital Subscriber Line) system is able to provide synchronous services to end user equipment connected to the DSLAM via a DSL link and Customer Premises Equipment (CPE). A sniffer device having direct or indirect access to a Primary Reference Clock (PRC) of the DSL system calculates the phase difference between the PRC and the DSLAM's Local Timing Reference (LTR). The phase difference is sent to the CPEs requiring accurate reference clock frequency. The CPEs are able to derive the PRC from the phase difference information transmitted by the sniffer device thus enabling synchronous end user equipment operation. | 03-15-2012 |
20120082173 | CLOCK SYNCHRONIZATION - In a clock synchronization system, clocks on a local area network are synchronized to a standard time signal such as the Network Time Protocol (NTP) signal or the Global Positioning System (GPS) time signal. A terminal on the network enables a user to introduce an offset to the clocks individually so that clocks can display the time in different time zones. | 04-05-2012 |
20120093177 | COMMUNICATION METHOD USING TIME-DIVISION MULTIPLEXING - A communication method using time-division multiplexing that enables permanent communication between user terminals. One of the terminals is a master terminal, the others being slave terminals. The transmission channel is divided into frames, each frame being divided into time slots. Each slave terminal identifies a free time slot in the current frame, in listening mode, and transmits data in the identified time slot, in transmission mode, during at least one following frame. As soon as the slave terminal ceases transmitting, the identified time slot becomes free again. | 04-19-2012 |
20120099608 | Synchronization Method and Device - A synchronization method is disclosed, including: obtaining a synchronization symbol position {circumflex over (d)} | 04-26-2012 |
20120106576 | Transparent Clock Adaptor for a Network Device - A transparent clock adaptor is provided for use with a router, switch or other network device that does not otherwise support transparent clock functionality. The transparent clock adaptor comprises a network port for coupling to a link of a network, a local port for coupling to a port of the network device, transparent clock processing circuitry operative to perform one or more transparent clock timing adjustment operations for each of a plurality of packets including at least one packet arriving in the adaptor via the network port and at least one packet arriving in the adaptor via the local port, and a synchronization interface for communicating with a corresponding synchronization interface of at least one other transparent clock adaptor. The adaptor can operate both as an ingress adaptor for packets arriving over the network link for delivery to the network device and as an egress adaptor for packets arriving from the network device for delivery over the network link. | 05-03-2012 |
20120140781 | DYNAMIC HOST CLOCK COMPENSATION - In accordance with a first embodiment of the present invention, a method for improving synchronization of communications between a first port and a second port is provided, the method performed at the first port and comprising: inserting skip symbols into a transmission stream for transmissions from the first port to the second port, wherein the skip symbols are inserted at a first average frequency level; detecting a lack of synchronization between the first port and the second port; and inserting skip symbols into the transmission stream at a second average frequency level greater than the first average frequency level in response to the detecting. | 06-07-2012 |
20120147904 | VIDEO SIGNAL TRANSMISSION DEVICE, VIDEO SIGNAL TRANSMISSION AND RECEIVING SYSTEM, AND VIDEO PROCESSING SYSTEM, THAT TRANSMIT/RECEIVE OVER A CLOCK LINE - The present invention is intended to permit both real-time display of a picture represented by a non-compressed video signal on a television and display of a picture represented by a compressed video signal at any desired time by simultaneously transmitting the compressed video signal and non-compressed video signal via one interface. An STB packetizes a compressed video signal, and multiplexes the compressed video signal and a blanking signal combined with a non-compressed video signal. Thus, both the video signals are transmitted simultaneously. A picture represented by the non-compressed video signal is displayed on a television in real time. The compressed video signal is stored in a storage medium incorporated in the television, read at any user's desired time, and decoded so that a picture represented by the compressed video signal can be viewed at the user's desired time. | 06-14-2012 |
20120155496 | TESTING DEVICE, TESTING METHOD, AND COMPUTER READABLE STORAGE MEDIUM - A test information obtaining unit captures an actual transaction from a pre-operation server and stores it in a pre-operation packet storing unit. A time synchronization control section synchronizes the time of a post-operation server with a time of the acquisition times of the captured packets. After performing this time synchronization, a test implementation section performs a test by sequentially transmitting the packets to the post-operation server, thus making responses of the pre-operation server and the post-operation server the same. | 06-21-2012 |
20120170597 | SYNCHRONIZING MULTIPLE SYSTEM CLOCKS - Techniques are disclosed for synchronizing multiple clock sources of a system, and may include: determining time of a first clock at a first and second time instants; determining time of a second clock at a third time instant occurring between the first and second time instants, and a fourth time instant occurring after the second time instant; and determining a clock offset between the first and second clocks based on the determined times. The first and/or second clocks may be adjusted based on the clock offset to synchronize clock operation. This adjusting can be used, for instance, to synchronize operation of an audio and/or video component operating according to the first clock with an audio and/or video component operating according to the second clock. The techniques may further include determining if the clock offset is valid (e.g., based on detection of perturbing events or difference between a clock's times). | 07-05-2012 |
20120177067 | CONTENT SYNCHRONIZATION APPARATUS AND METHOD - A content synchronization apparatus is provided. The content synchronization apparatus includes a communication unit configured to communicate with a device that the content synchronization apparatus can synchronize content with, a control unit configured to, in response to a synchronization command to share current content being played by the device being received, share the current content by acquiring the current content and state information corresponding to the current content through the communication unit, synchronize the current content with the device using the current content and the state information, and configure a display screen based on the results of the synchronization of the current content with the device, and an output unit configured to display the configured display screen. | 07-12-2012 |
20120177068 | TIME SYNCHRONIZATION IN WIRELESS COMMUNICATION NETWORKS - A communication terminal includes a Radio Frequency (RF) unit and a baseband processor. The RF unit is operative to receive signals from a Base Station (BS) of a wireless communication network using a communication protocol that defines time frames divided in a time domain into zones. Each zone corresponds to a respective communication mode between the BS and the terminal and occupies respective time intervals within the frames. | 07-12-2012 |
20120207182 | Encoding System and Encoding Apparatus - An encoding apparatus | 08-16-2012 |
20120219019 | METHOD AND ARRANGEMENT FOR SYNCHRONISING DATA STREAMS IN NETWORKS AND A CORRESPONDING COMPUTER PROGRAM AND CORRESPONDING COMPUTER-READABLE STORAGE MEDIUM - The invention relates to a method and arrangement for synchronising data streams in networks and to a corresponding computer program and corresponding computer-readable storage medium which can be used, in particular, for synchronising different audio playback devices (audio adapters) within a home network. Said home network can be a conventional computer network comprising both wireline and wireless components. According to the invention, in order to synchronise the data output in networks in which at least one data stream is transmitted by a network unit to at least two output units of the network, where said stream is outputted, first common time information is made available to at least the output units and the output of the data in the data stream is synchronised at least in terms of the phase and/or frequency on the basis of the first common time information. | 08-30-2012 |
20120243559 | Synchronization, Re-Synchronization, Addressing, and Serialized Signal Processing for Daisy-Chained Communication Devices - Techniques for use in a data communication system having a number of communicatively coupled device include techniques for synchronization and re-synchronization of frame and bit clocks, techniques for assigning device address, techniques for dynamically controlling transmit power based on the number of devices, and techniques for serialized signal processing. | 09-27-2012 |
20120250704 | NETWORK NODE, TIME SYNCHRONIZATION METHOD AND NETWORK SYSTEM - In order to select a synchronization signal higher in accuracy, thereby increasing the accuracy of the time synchronization, it is provided a network node for transferring data in a network, comprising: a network interface having a plurality of ports; a transfer control module; a time synchronizing module; a fluctuation measurement module; and a clock. The time synchronization module uses a received time synchronization packet to synchronize the clock. The fluctuation measurement module determines an accuracy of a time contained in the received time synchronization packet based on a result of comparison between the time contained in the received time synchronization packet and a time of the clock. | 10-04-2012 |
20120257641 | METHOD, A COMPUTER PROGRAM PRODUCT, AND A CARRIER FOR INDICATING ONE-WAY LATENCY IN A DATA NETWORK - Disclosed herein is a method, a computer program product, and a carrier for indicating one-way latency in a data network (N) between a first node (A) and a second node (B), wherein the data network (N) lacks continuous clock synchronization, comprising: a pre-synchronisation step, a measuring step, a post-synchronisation step, an interpolation step, and generating a latency profile. The present invention also relates to a computer program product incorporating the method, a carrier comprising the computer program product, and a method for indicating server functionality based on the first aspect. | 10-11-2012 |
20120257642 | METHOD FOR SYNCHRONIZING CLOCKS IN A COMMUNICATION SYSTEM - A method for clock synchronization between higher layers using synchronization information provided from lower layers in multi-clock communication system in which the higher layers and the lower layers use heterogeneous clocks is provided. | 10-11-2012 |
20120263193 | TRANSMISSION SYSTEM, TRANSMITTING DEVICE, RECEIVING DEVICE, TRANSMISSION METHOD, AND COMPUTER PROGRAM - Disclosed is a transmission system, having a transmitting device and a receiving device, which divides a series of data streams into a plurality of unit data and transmitting the unit data. The transmitting device and receiving devices include synchronization units outputting mutually synchronized clock signals. A frequency change unit changes a frequency of a time division multiplexing (TDM) signal on the basis of the clock signal output from the synchronization unit of its own device. A conversion unit converts the TDM signal with the changed frequency into the unit data and transmitting the unit data to the receiving device. A decoding unit receives the unit data from the transmitting device and generates the TDM signal with the changed frequency. A frequency restoration unit restores the TDM signal by returning a frequency of the TDM signal with the changed frequency to an original on the basis of the clock signal. | 10-18-2012 |
20120263194 | METHOD AND APPARATUS FOR MEASURING SWITCHING TIME OF ETHERNET RING NETWORK - The present invention provides a method for measuring switching time of an Ethernet ring network, which comprises the following steps: synchronizing a local time of each node in the Ethernet ring network ( | 10-18-2012 |
20120269204 | METHOD FOR GENERATING A ROBUST TIMING CORRECTION IN TIMING TRANSFER SYSTEMS - High accuracy timing over packet networks is achieved by generating correction factors from multiple separation intervals and timing information contained in packets in both directions between a master and a slave. The methods are based on evaluating the weighted average of short-term, medium-term, and long-term measurements of local clock offset. Weighted averages are used to develop robust correction terms that are modified with an α-shaping factor to provide additional immunity to packet network instabilities. | 10-25-2012 |
20120287948 | CONFIGURATION OF SYNCHRONISATION NETWORK - Configuring a node ( | 11-15-2012 |
20120294318 | Method and System for Implementing Time Synchronization in Local Area Network (LAN) - A method and a system for implementing time synchronization in a local area network are disclosed, and the local area network includes a master system device ( | 11-22-2012 |
20120300794 | GUARDIAN SCRUBBING STRATEGY FOR DISTRIBUTED TIME-TRIGGERED PROTOCOLS - A cluster comprises a plurality of end nodes that communicate with one another over at least one communication channel. Each end node is assigned a time slot for transmission of frames; wherein each node comprises a local guardian configured to prevent transmission of timing-related frames sourced from the respective end node. The cluster also comprises a special node that communicates with the plurality of end nodes, wherein the special node establishes a time base and sources timing-related frames to the plurality of end nodes. The transmission schedule includes at least one common scrubbing time slot during which each of the plurality of end nodes is configured to generate a timing-related frame. The special node is configured to determine if the local guardian in any of the plurality of nodes failed to prevent transmission of the respective generated timing-related frame during the common scrubbing time slot. | 11-29-2012 |
20120300795 | NETWORK DISTRIBUTED PACKET-BASED SYNCHRONIZATION - A transparent clock may be provided between edge nodes of a non-precision time protocol network, with an arrival time of a packet at an edge of the non-precision time protocol network carried in a reserved field of a packet. | 11-29-2012 |
20120307844 | Synchronization of Shared Identifiers Across Servers in an IMS Network - Methods and apparatuses, including computer program products, are described for synchronization of shared initial filter criteria in an IP Multimedia Subsystem (IMS) network. A first computing device in the IMS network transmits a registration request to a second computing device in the IMS network. The first computing device receives a response to the registration request from the second computing device, including an identifier associated with a shared initial filter criteria set stored at the first computing device. The first computing device determines whether the shared initial filter criteria set corresponding to the identifier is stored at the first computing device and transmits a retrieval request to the second computing device if the shared initial filter criteria set corresponding to the identifier is not stored. The first computing device receives the shared initial filter criteria set from the second computing device, and stores the shared initial filter criteria set. | 12-06-2012 |
20120307845 | METHOD FOR DETECTING A SYNCHRONIZATION FAILURE OF A TRANSPARENT CLOCK AND RELATED PROTECTION SCHEMES - The method for detecting and managing a synchronization failure of a transparent clock is used in a packet network in order to determine and correct residence time of time-stamped packets within a traversed element of said network. The transparent clock is part of a Master/Slave synchronization path including a plurality of network elements and their associated transparent clocks. The method includes transmitting time-stamped packets from the Master to the Slave through different synchronization paths in order to have the Slave receiving multiple time signals transmitted through different paths, and determining a failure within a transparent clock of a failed/failing synchronization path if the time signal provided by said failed/failing path differs from the time signal provided by the other transmitting path(s). | 12-06-2012 |
20120314721 | TIMING RECOVERY METHOD AND APPARATUS FOR AN INPUT/OUTPUT BUS WITH LINK REDUNDANCY - Methods and apparatus are provided for timing recovery for an input/output bus with link redundancy. A parallel input/output interface receiver includes a plurality of data receivers, each configured to respectively receive input data from a respective one of n+m channels, where n is an integer greater than one and m is an integer greater than or equal to one. The input data is non-calibration data for the n channels and is calibration data for the m channels. The interface receiver further includes a first phase adjustor configured to provide a first clock signal to the plurality of data receivers for sampling of only the non-calibration data at any given time, and a second phase adjustor configured to provide a second clock signal to the plurality of data receivers for sampling of only the calibration data at any given time. | 12-13-2012 |
20120320933 | METHOD AND APPARATUS FOR TRANSPORTING TIME RELATED INFORMATION IN A PACKET SWITCHED NETWORK - A time aware device for a packet switched network comprising at least one time tag processing unit adapted to process time tag data of a predetermined time tag data field (TTDF) provided within a header of a tagged data packet (TDP) transported in said packet switched network to provide time related information reflecting a delay undergone by said tagged data packet (TDP) during its transport in said packet switched network. | 12-20-2012 |
20120327957 | DATA PACKET SYNCHRONIZATION AND RETURN-TO-ZERO CONVERSION - The present invention relates to a system and method that enable transmission of multiple data packet lines as an optical time-division multiplexed signal. The invention provides a method and system that can synchronize data packet signals to a clock and convert them into return-to-zero signals. When multiple data packet lines are converted, they can be multiplexed together and transmitted according to well-known methods. | 12-27-2012 |
20130010812 | SYSTEMS AND METHODS FOR SYNCHRONIZING VARIOUS TYPES OF DATA ON A SINGLE PACKET - Data recording systems ( | 01-10-2013 |
20130010813 | Method and Apparatus for Optimizing Packet Timing Transport - There is provided a method of optimizing timing packet transport in a network node, the method comprising using a locally available stable frequency reference at the network node to provide a pre-determined network node transit time for timing packets in at least one direction into or out of the network node. There is also provided a network node comprising a locally available stable frequency reference and circuitry adapted to apply a pre-determined network node transit time, L, to all timing packets transiting the network node in at least one direction into or out of a network node dependent on the locally available stable frequency reference. | 01-10-2013 |
20130010814 | NODE DEVICE, COMMUNICATION SYSTEM AND TIME SYNCHRONIZATION METHOD - A node device that conducts time synchronization processing, the node device including: a processor configured to measure a reception time of a time synchronization message transmitted addressed to another node device from a master node device, the time synchronization message including information of a transmission time from the master node device, to detect the time synchronization message, and extracts information of the transmission time from the detected time synchronization message, and to correct a time in the processor based on the extracted information of the transmission time and the information of the reception time, and a transmitter configured to forward the time synchronization message to the another node device when the time synchronization message received by a receiver addressed to the another node device. | 01-10-2013 |
20130016738 | METHOD AND APPARATUS FOR IMPLEMENTING FRAME HEADER ALIGNMENT AND MULTI-FRAME ZEROINGAANM Yu; ShideAACI ShenzhenAACO CNAAGP Yu; Shide Shenzhen CNAANM Ma; WenkaiAACI ShenzhenAACO CNAAGP Ma; Wenkai Shenzhen CN - The present invention discloses a method for implementing frame header alignment and multi-frame zeroing. By using one indication signal, the period of which is 256 times of that of a single frame, the frame header alignment for frame data is completed, and the multi-frame zeroing for frame data is implemented. The present invention also discloses an apparatus for implementing frame header alignment and multi-frame zeroing. The implementation process of the present invention is simple, the process comprising the frame data processing in an Optical Transport Network (OTN) cross dispatching system can be effectively simplified, the complexity of system processing can be significantly decreased, and the logical resources of the system can be saved. | 01-17-2013 |
20130058362 | Receiving Apparatus and Method for Multi-Frame Synchronization - The present invention discloses a multi-frame synchronization method, the method comprises: for each received sub-frame, a receiver determining a probability that the received sub-frame is each of sub-frames in a multi-frame, a sub-frame with maximum probability being a state of the currently received sub-frame after N sub-frames are received. The present invention further discloses a receiving apparatus for multi-frame synchronization comprising a calculation module; wherein the calculation module is configured to calculate a probability that a received sub-frame is each of sub-frames in a multi-frame, and determine a state of the currently received sub-frame based on a sub-frame with maximum probability after N sub-frames are received. The present invention effectively achieves a position for multi-frame synchronization and low calculation complexity. | 03-07-2013 |
20130064253 | APPARATUS AND METHODS FOR MULTI-STAGE MULTIPLEXING IN A NETWORK - Methods and apparatus for performing multiplexing of video or other content (e.g., programs) within a network using feed-back from a subsequent digital program insertion stage, and/or feed-forward information from a prior multiplexing stage. In one embodiment, the network comprises a hybrid fiber coax (HFC) cable network having headend and hub-based statistical multiplexing stages, and communication between the two stages is used to improve the visual quality performance and bandwidth utilization of the output multi-program stream during conditions where downstream content is inserted into the transport stream. Business methods associated with the various multiplexing features described above are also disclosed. | 03-14-2013 |
20130077642 | SYSTEMS AND METHODS UTILIZING RANDOMIZED CLOCK RATES TO REDUCE SYSTEMATIC TIME-STAMP GRANULARITY ERRORS IN NETWORK PACKET COMMUNICATIONS - Systems and methods are disclosed for utilizing slave (receive) time-stamp clock rates that are different from master (sender) time-stamp clock rates to randomize and thereby reduce systematic time-stamp granularity errors in the communication of network packets. The slave (receive) time-stamp clock rate for some embodiments is set to be a fixed value that has a relationship with the master (sender) time-stamp clock rate such that the ratio of the slave (receive) clock rate to the master (sender) clock rate is a rational number. Other embodiments use a time-varying frequency for the slave (receive) time-stamp clock rate to randomize the slave (receive) time-stamp clock with respect to the master (sender) time-stamp clock. Additional time-stamps can also be generated using a slave (receive) time-stamp clock having a rate set to equal the rate of the master (sender) time-stamp clock signal. Further spread spectrum and/or delta-sigma modulation techniques can be applied to effectively randomize the slave (receive) time-stamp clock. | 03-28-2013 |
20130083809 | COMMUNICATIONS SYSTEM FOR TRANSMISSION OF SIGNALS BETWEEN TERMINAL EQUIPMENT CONNECTED TO INTERMEDIATE EQUIPMENT CONNECTED TO AN ETHERNET NETWORK - A communication system for transmission of signals between various terminal equipment connected to various intermediate equipment and connected to a communications network using the Ethernet protocol is disclosed. In one aspect, the terminal equipment is not master-controlled by a distributed clock and the intermediate equipment each includes at least one Ethernet access physical interface. In the communication system, reference time information is periodically transmitted by the reference clock generator and distributed as data transport packets to the intermediate equipment via the Ethernet access physical interface. Each intermediate equipment includes a local clock generator, the reference time information is received and processed by each intermediate equipment, so as to subordinate the local clock generator to the reference clock. The mechanism configured to process the signals is clocked by the local clock generator so as to obtain synchronous processing of the transmitted signals. | 04-04-2013 |
20130089110 | Mechanism For Channel Synchronization - A channel synchronization method in which local serializers serially transmits first n-bit codes, respectively, to remote deserializers, respectively. Also local deserializers serially receive first n-bit codes, respectively, from remote serializers, respectively. One of the first n-bit codes transmitted to one of the remote serializers indicates one of the local deserializers is not link aligned. | 04-11-2013 |
20130094523 | TIME SYNCHRONIZATION METHOD AND SYSTEM, AND NODE DEVICE - The present disclosure discloses a time synchronization method. In the method, a first node sends a first time packet at a first time over a first working wavelength; a second node receives the first time packet at a second time. The first node sends a second time packet at a third time over a second working wavelength. The second node receives the second time packet at a fourth time; calculates an absolute time deviation between the second node and the first node according to the first time, the second time, the third time, the fourth time, a first signal transmission rate corresponding to the first working wavelength, and a second signal transmission rate corresponding to the second working wavelength, and synchronizes the local time between the second node and the first node. Further, a time synchronization system and a node device are disclosed. | 04-18-2013 |
20130100966 | SYSTEM FOR TRANSFERRING ELECTRIC POWER AND SIGNALS VIA POWER LINE BY TIME-DIVISION MULTIPLEXING - A system for transferring electric power and signals via a power line by time-division multiplexing includes a power line, electronic-circuit units, and controllers. The power line includes a first transmission line and a second transmission line. The first transmission line is connected with a first switch in series and is therefore divided into a source end and a loading end. The electronic-circuit units are connected in series between the loading end and the second transmission line. The controllers are electrically connected with and are configured for synchronously controlling the first switch and the electronic-circuit units. When the first switch is closed, electric power is transferred from an electric power source to the loading end, and when the first switch is opened, the electronic-circuit units transfer signals via the loading end. The system features simple circuitry and effectively reduces noise in signal transmission. | 04-25-2013 |
20130100967 | Systems and Methods for Synchronization of Clock Signals - A terminal of an exemplary transmitting device is configured to receive an initial clock signal. A first phase lock loop is configured to lock a phase of an initial periodic signal with a phase of the initial clock signal. A transmitting data block interface is configured to provide the plurality of data blocks with samples of the initial periodic signal to a receiving device. An exemplary receiving device includes a receiving data block interface configured to receive the plurality of data blocks. A second phase lock loop is configured to recreate the initial periodic signal and lock a phase of the recreated periodic signal with a phase of the samples of the initial periodic signal. The clock signal generator is configured to recreate and provide the initial clock signal. The recreated clock signal is synchronized to the initial clock signal based on the phase of the recreated periodic signal. | 04-25-2013 |
20130107896 | SERVICES, SYSTEMS AND METHODS FOR PRECISELY ESTIMATING A DELAY WITHIN A NETWORK | 05-02-2013 |
20130107897 | METHOD FOR TRANSMITTING AN ESMC MESSAGE THROUGH A SONET/SDH DOMAIN | 05-02-2013 |
20130121351 | FRAME TRANSMISSION DEVICE AND SYNCHRONIZATION METHOD - A frame transmission device includes: a clock section; a path control section to switch a plurality of transmission paths for exchanging a time synchronization frame with a node device that measures a reference time; a fluctuation estimation section to set a fluctuation estimate of a transmission delay of the time synchronization frame on each of the plurality of transmission paths; and a time synchronization section to synchronize the clock section to the reference time in accordance with a time synchronization frame exchanged on a selected transmission path selected from among the plurality of transmission paths based on the fluctuation estimate. | 05-16-2013 |
20130121352 | METHOD AND DEVICE FOR TIME SYNCHRONIZATION - A method and a device for time synchronization are disclosed according to the embodiments of the present invention. The method includes: selecting, by a slave device, a port of a single-fiber bi-directional line as a synchronization port of a 1588 clock protocol; specifying a work mode of the synchronization port; exchanging a 1588 clock synchronization packet with a master device through the synchronization port according to the work mode; acquiring transmission time information and restore a system clock according to the 1588 clock synchronization packet; and adjusting the system clock according to the work mode and the transmission time information. The device includes: a line processing module, a clock recovery module and a clock adjustment module. Through the method and the device, zero-error time synchronization is implemented; and in the case of unfixed path delay, the time synchronization can also be implemented. | 05-16-2013 |
20130128903 | PACKET-BASED TIMING MEASUREMENT - A slave communication device may transmit a packet to the master communication device, with the packet including a transmission time field and a correction field. The transmission time field may contain a value indicative of an approximate time of transmission of the packet by the slave communication device, and the correction field may contain a value indicative of a difference between the approximate time of transmission and an actual time of transmission of the packet by the slave communication device. | 05-23-2013 |
20130163617 | MULTI-PROTOCOL I/O INTERCONNECT TIME SYNCHRONIZATION - Described are embodiments of methods, apparatuses, and systems for time synchronization of a multi-protocol I/O interconnect of computer apparatus. A method for synchronizing time across the multi-protocol I/O interconnect may include providing a first local time of a first switch of a switching fabric of a multi-protocol interconnect to a second switch of the switching fabric, and adjusting a second local time of the second switch to the first local time. Other embodiments may be described and claimed. | 06-27-2013 |
20130163618 | METHOD FOR MONITORING AND MANAGING DATA NETWORKS - A method and a network node are provided, for distributing timing information in a packet-switched network. The method is characterized in that at least one network node used as a quasi slave node is located at a path extending between a master node and a slave node. The method comprising a step of calculating the timing at that network node, by passively processing packets belonging to a PTP-type packet stream being exchanged between the master node and the slave node and conveyed via that intermediate network node operating as a quasi slave. | 06-27-2013 |
20130170507 | TIME SYNCHRONIZATION FOR NETWORK TESTING EQUIPMENT - The invention relates to time synchronization between network testing elements in distributed network monitoring and testing systems, and provides a condensed PTP process wherein the number of timing messages exchanged between master and slave in one iteration of the time synchronization process is reduced. Furthermore, timing messages are encrypted to provide for a more secure synchronization process. One aspect of the method provides for an automatic detection and adaptive handling of protocol stacks of received timing packets. | 07-04-2013 |
20130182723 | COMMUNICATIONS SYSTEM AND RELATED METHOD FOR REDUCING CONTINUITY CHECK MESSAGE (CCM) BURSTS IN CONNECTIVITY FAULT MANAGEMENT (CFM) MAINTENANCE ASSOCIATION (MA) - In accordance with a non-limiting example, a system and method minimizes collisions between transmitted connectivity fault management (CFM) packets. Maintenance association endpoints are formed from a plurality of network switch elements to form a maintenance association. The clocks between each network switch element within the maintenance association are synchronized. A unique transmission window is assigned to each maintenance association endpoint as part of the maintenance association. A respective CFM packet is transmitted as a continuity check message (CCM) within the unique transmission window. | 07-18-2013 |
20130188656 | Communicating Control Information for a Data Communications Link Via a Line Being Calibrated - Control information for controlling a parallel data link is communicated on a line being calibrated. Preferably, the parallel data link includes a redundant line. The redundant line permits one line to be calibrated while the others carry functional data, a switching mechanism enabling each line to be selected in turn for calibration. The control information preferably includes information for coordinating calibration activity. Preferably, the link is bi-directional, having a separate redundant line in each direction, enabling a bi-directional handshaking protocol to be used for communicating control information. Preferably, the lines selected for calibration are time-multiplexed to carry calibration patterns and control information at different time intervals. | 07-25-2013 |
20130195123 | CLOCK RECOVERY OVER PROTECTED PACKET NETWORKS - A method and circuit for recovering a clock signal in a receiving station, wherein the receiving station receives packets carrying timing information” (TI) from a transmitting station over a packet switched network, the TI relating to a reference timing source located over the network. The method comprises the steps of: calculating over time, in the receiving station, a “TI Delay” variable based on a relative time difference between a timestamp assigned to a sample of a clock signal generated in the receiving station and the TI; upon detecting a Delay Deviation in the TI Delay, accumulating the Delay Deviation in an “Accumulated Deviation” variable; subtracting the Accumulated Deviation from the TI Delay; adjusting the frequency of the clock signal based on the TI Delay; and upon detecting that the Accumulated Deviation absolute value is smaller than a Zeroing Threshold, zeroing the Accumulated Deviation before subtracting it from the TI Delay. | 08-01-2013 |
20130195124 | TIMEBASE PERIPHERAL - A microcontroller has a timebase driven by a clock signal, wherein the timebase has a reset input and an output coupled with a comparator. The comparator is further coupled with a register and is operable to generate a synchronization output signal if the timebase matches the register value. The microcontroller further has a first multiplexer receiving the synchronization output signal from the comparator and further receiving at least one event signal generated by a unit other than the timebase, wherein the first multiplexer is operable to select either the synchronization output signal or the at least one event signal as a timebase synchronization output signal. | 08-01-2013 |
20130202002 | Node Level Vectoring Synchronization - An apparatus for synchronizing a plurality of digital subscriber line access multiplexers (DSLAMs) comprising a reference clock configured to generate a reference clock signal, and an interface configured to transmit the reference clock signal to the DSLAMs, wherein each of the DSLAMs is configured to align its system clock with the reference clock. | 08-08-2013 |
20130208735 | CLOCK SYNCHRONIZATION USING MULTIPLE NETWORK PATHS - In a network device communicatively coupled to a master clock via a plurality of different communication paths, a clock synchronization module is configured to determine a plurality of path time data sets corresponding to the plurality of different communication paths based on signals received from the master clock via the plurality of different communication paths between the network device and the master clock. A clock module is configured to determine a time of day as a function of the plurality of path time data sets. | 08-15-2013 |
20130215910 | TRANSMISSION APPARATUS, TRANSMISSION METHOD, PROGRAM, AND COMMUNICATION SYSTEM - A transmission apparatus transmits a timestamp in increments of 10 | 08-22-2013 |
20130215911 | MULTI-INTERFACE COMPATIBLE BUS OVER A COMMON PHYSICAL CONNECTION - A multi-interface bus allows for different bus standards to be implemented over the same set of physical bus lines. More particularly, in one implementation, the system includes a first circuit board, a second circuit board, and a bus connecting the first and second circuit boards. The second circuit board is configured to communicate with the first circuit board using either a synchronous or an asynchronous bus protocol determined based on a bus protocol used by the first circuit board. | 08-22-2013 |
20130223458 | METHOD FOR SYNCHRONIZING MASTER AND SLAVE CLOCKS OF A PACKET-SWITCHED NETWORK WITH AGGREGATED CONNECTIONS BETWEEN NODES, AND ASSOCIATED SYNCHRONIZATION DEVICES - A method is dedicated to synchronizing master (HM) and slave clocks (HE) of a packet-switched network comprising at least two equipments (E | 08-29-2013 |
20130235887 | CHANNEL BONDING SYNCHRONIZATION - Different data communication architectures deliver a wide variety of content, including audio and video content, to consumers. The architectures employ channel bonding to deliver more bandwidth than any single communication channel can carry. In some implementations, the communication architectures distribute data streams to bonded channels that are clocked independently. A system is provided for synchronizing the bonded channels. | 09-12-2013 |
20130235888 | INTERWORKING AGENT ADAPTED TO INTERACT BETWEEN NETWORK AND PRECISION TIME PROTOCOL ENTITIES - The embodiments of the present invention refer to an interworking agent aimed at being installed in a network node comprising a Precision Time Protocol “PTP” module, said agent comprising:
| 09-12-2013 |
20130272321 | METHOD AND SYSTEM FOR SYNCHRONIZATION BETWEEN NETWORK ELEMENTS - A system for synchronizing a first network device and a second network device. The first network device comprises an interface configured to release over a communication link a first signal carrying a first data stream clocked by a first clock signal. The second network device comprises an interface configured to receive the first signal over the communication link. The second network device also comprises a clock extraction module configured to generate an extracted clock signal from the received first signal; and a data coding module configured to clock a second data stream with an output clock signal selected based on a speed of a locally generated clock signal relative to the first clock signal or the extracted clock signal, thereby to produce a second signal for transmission from the second network element to the first network element. | 10-17-2013 |
20130287048 | System and Method for Delivering Content in a Unicast/Multicast Manner - The present invention is a system and method for enabling multicast synchronization of initially unicasted content. Multiple unicast streams are synchronized in order to convert the unicast streams into a multicast stream. Each unicast stream may be accelerated or slowed down in relation to a reference stream to a common point within each stream upon which the unicast streams are replaced by a multicast stream of the same content. | 10-31-2013 |
20130301657 | Synchronous Network Device - A networking device includes a plurality of network ports and a clock synchronizer. Each network port is configured to receive a respective signal over a respective physical medium. A selected network port is configured to recover a clock signal from the respective signal received by the selected network port. Each of the network ports is configured to be selectable as the selected network port. The clock synchronizer is configured to generate a transmit clock signal in response to the clock signal recovered by the selected network port. The selected network port is configured to transmit data over the respective physical medium according to a local clock signal generated by a clock signal generator local to the networking device. Each network port other than the selected network port is configured to transmit data over the respective physical medium according to the transmit clock signal generated by the clock synchronizer. | 11-14-2013 |
20130301658 | COMMUNICATION SYSTEM, CONTROL DEVICE, FORWARDING NODE, COMMUNICATION CONTROL METHOD, AND PROGRAM - A communication system includes a control device that deteitnines packet processing rules; a forwarding node that processes a received packet using a processing rule that includes one of a plurality of processing rules transmitted from the control device and that corresponds to the received packet; a comparison unit that compares a first value with a second value wherein the first value is calculated from a first processing rule group held in the forwarding node and the second value is calculated from a second processing rule group determined by the control device for transmission to the forwarding node; and a confirmation unit that confirms if the forwarding node and the control device are synchronized based on the comparison result. | 11-14-2013 |
20130308658 | NETWORK ELEMENT FOR A PACKET-SWITCHED NETWORK - A network element for a packet-switched network has a plurality of network ports for exchanging synchronization messages with further network elements, a local clock, a timestamp generation module associated to each network port for triggering generation of a timestamp, and a synchronization control module selectively configurable in a first operating mode and a second operating mode as a function of a configuration signal. When the synchronization control module is configured in the first operating mode, it is adapted to adjust an offset of the local clock as a function of the timestamps of the synchronization messages received through the slave port. When the synchronization control module is configured in the second operating mode, it is adapted to compute a residence time of a synchronization message in the network element as a function of the timestamps obtained at the time of receiving and sending the synchronization message. | 11-21-2013 |
20130329752 | REMOTE RE-MULTIPLEXING WITH PACKET INCLUSION - In one system embodiment, a master re-multiplexer may be configured to receive an indexed transport stream, re-multiplex the indexed transport stream by performing a set of re-multiplexing operations, generate a helper transport stream, the helper transport stream comprising a description of the set of operations, wherein the set of operations comprises both program clock reference (PCR) re-stamping and inserting packets, and providing the helper transport stream over a communications network to plural remote re-multiplexers capable of identically re-multiplexing the indexed transport stream based on the helper transport stream. | 12-12-2013 |
20130329753 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A managing station comprises a delay time measuring unit that measures, while transmitting a delay time measurement frame to each of the slave stations and receiving a response frame responsive to the delay time measurement frame from the slave station, an elapsed time from when transmitting the delay time measurement frame to when receiving the response frame and that calculates a delay time of the slave station; and a delay detecting unit that compares the calculated delay time and a delay judgment value that is an average of the delay times calculated in a past for the slave station to determine whether delay is occurring in the slave station for each of the slave stations and that identifies, if delay is occurring in the slave station, the position of a delay element using connection configuration information indicating connection states between the communication apparatuses in the network. | 12-12-2013 |
20130336338 | Method For Operating A Network Arrangement, Network System And Network Arrangement - A method for operating a network arrangement having a plurality of network systems is disclosed. Data belonging to a first class is synchronously transmitted in a specified time slot identical for all network systems. A network system, which owing to a synchronization error during the specified time slot, receives data belonging to other classes from a plurality of senders, then only sends data belonging to the first class, but now in standard messages belonging to class 2. Non-vital data belonging to the other classes is no longer transmitted in this operating state. Improved failure safety and in particular a fail-operational mode is provided by the behavior of the network systems in the event of synchronization errors. A network system which implements the method and a network arrangement having a plurality of corresponding network systems is also proposed. | 12-19-2013 |
20130336339 | Transmission Protocol - A method is described for the transmission of data among devices (D | 12-19-2013 |
20130336340 | MASTER APPARATUS AND SLAVE APPARATUS AND TIME-SYNCHRONIZATION METHOD - A master apparatus repeatedly executes an offset value calculation notification sequence in which a calculation of an offset value for correcting a transmission path delay is implemented after communications with the plurality of slave apparatuses, and a notification of the offset value calculated to the plurality of slave apparatuses is implemented Every time the offset value calculation notification sequence is executed, the master apparatus notifies the slave apparatuses of a sequence identifier which is the identifier of the offset value calculation notification sequence. Furthermore, the master apparatus selects a sequence identifier from among two or more sequence identifiers already notified to each slave apparatus, notifies the selected sequence identifier to each slave apparatus, and instructs each slave apparatus to use, for time-synchronization, an offset value notified in the offset value calculation notification sequence corresponding to the selected sequence identifier. | 12-19-2013 |
20130336341 | SYNCHRONIZING SYSTEM, SYNCHRONIZING METHOD, FIRST SYNCHRONIZING DEVICE, SECOND SYNCHRONIZING DEVICE, AND COMPUTER PROGRAM - Provided is a synchronization system comprising a first synchronization device and a second synchronization device which carry out synchronization processing by transmitting and receiving synchronization packets in accordance with a synchronization protocol and which synchronize the times thereof. The first synchronization device, which corresponds to a slave device, notifies an abnormality to the second synchronization device when an abnormality related to time synchronization processing is detected. The second synchronization device, which corresponds to a master device, increases the interval during which synchronization is performed as the length of time during which an abnormality notification is not received increases. | 12-19-2013 |
20130343409 | METHODS AND APPARATUS FOR PRECISION TIME STAMPING - In a network device, apparatus and methods perform precision time stamping. A time agent receives a master pace signal corresponding to a time representation based on a master real time clock in a master clock domain. A time accumulator accumulates time units one fill quantum at a time based on the master pace signal. The time accumulator decreases the accumulated time units by a leak quantum according to a local clock signal running at a higher frequency than the master pace signal. Correction logic periodically generates, at a granularity corresponding to the frequency of the local clock signal, an updated time representation in a target clock domain based on a residual number of time units in the time accumulator before depositing an additional fill quantum of time units in the time accumulator. | 12-26-2013 |
20140003454 | METHOD AND SYSTEM FOR RECORDING, SYNCHRONIZING AND ANALYSING DATA BY MEANS OF ANALYSIS DEVICES WHICH ARE SPATIALLY DISTRIBUTED IN A COMMUNICATION NETWORK | 01-02-2014 |
20140010244 | METHOD, APPARATUS AND SYSTEM FOR TIME DISTRIBUTION IN A TELECOMMUNICATIONS NETWORK - The invention is directed to a clock module and method for distributing a time reference to at least one clock in a packet-switched network. The clock module includes a slave port, a master port and a local clock. The method comprises the steps of receiving a first synchronization packet at the slave port, the first synchronization packet comprising a first master clock timestamp and generating at least one internal signal comprising the first master clock timestamp. The method also includes the steps of transmitting the at least one internal signal to the master port and receiving the at least one internal signal at the master port. Then a method includes determining the internal propagation time of the signal through the clock module and generating a second synchronization packet at the master port comprising a second master clock timestamp, the second master clock timestamp comprising the sum of the first master clock timestamp and the internal propagation time. Finally, the second synchronization packet is sent to at least one other clock in the packet-switched network. | 01-09-2014 |
20140023094 | CHANNEL FREQUENCY OFFSET ESTIMATION METHOD, APPARATUS, AND SYSTEM - Embodiments of the present invention provide a method, includes: performing channel estimation on a signal of a current channel to obtain channel information of the current channel, performing calculation processing on the channel information obtained in current channel estimation and channel information obtained in previous channel estimation to obtain a phase difference of the current channel information, dividing the phase difference of the current channel information by a time interval between two times of channel estimation to obtain residual frequency offset information of the current channel, adding the residual frequency offset information of the current channel and frequency offset information which is of the channel and obtained in a previous calculation to obtain frequency offset information of the current channel, and outputting the frequency offset information of the current channel, so as to perform frequency offset correction on the signal of the channel according to the current frequency offset information. | 01-23-2014 |
20140023095 | Method and System for MAC and PHY Synchronization for Energy Efficient Networking - Aspects of a method and system for MAC and PHY synchronization for energy efficient networking are provided. In this regard, an interface that enables communication between a MAC controller and a PHY device may be configured to operate in an energy saving mode. While the interface is operating in an energy saving mode, synchronization between the MAC controller and the PHY device may be maintained by one or both of adjusting a clock generated for the interface and/or communicating dummy data via the interface. The clock may be adjusted by one or more of adjusting a frequency of the clock, adjusting an amplitude of the clock, and/or duty cycling the clock. The MAC controller and/or the PHY device may generate the dummy data. The PHY device and/or the MAC controller may discard the dummy data upon receiving the dummy data. | 01-23-2014 |
20140036935 | SYSTEM AND METHOD FOR REAL-TIME DETECTION, IDENTIFICATION AND REPORTING OF MAC-SYNC FAILURES IN DISTRIBUTED TRUNKING - A system and method for real-time detection, identification, and reporting of mac-sync failures in distributed trunking (DT) are disclosed. In one example, a mac-sync failure between a pair of communicatively coupled DT switches is detected in real-time. Further, a type of mac-sync failure between the pair of DT switches is dynamically identified upon detecting the mac-sync failure. Furthermore, an information technology (IT) admin is dynamically notified about the type of mac-sync failure between the pair of DT switches. | 02-06-2014 |
20140036936 | TUNNEL FOLLOW-UP MESSAGE FOR TRANSPARENT CLOCK - A method for handling at least one encapsulated synchronization message by a tunnel node including a transparent clock, includes generating a signature from the encapsulated synchronization message and generating, or updating if it has already been generated, a tunnel follow-up message. The tunnel follow-up message includes the encapsulated synchronization message signature. The method further includes measuring the encapsulated synchronization message residence time across the tunnel node, and updating the correction field of the tunnel follow-up message with the measured residence time. | 02-06-2014 |
20140050232 | SYNCHRONIZATION CONTROL SYSTEM - According to an embodiment, the transmission processor of the master terminal includes a sending/receiving processor which sends a synchronization request demanding packet to a particular slave terminal and sends a synchronization reply packet when receiving a synchronization request packet from the slave terminal that has received the synchronization request demanding packet, and a synchronization controller which calculates a synchronization band from the time of the receipt of the data packet and from time information added to the received data packet to determine a synchronization state and which adjusts a correction amount in accordance with the synchronization state and sends an internal timing correction command to the timing generator. | 02-20-2014 |
20140056318 | SYSTEM FOR ESTABLISHING AND MAINTAINING A CLOCK REFERENCE INDICATING ONE-WAY LATENCY IN A DATA NETWORK - A method for indicating one-way latency in a data network, with continuous clock synchronization, between first and second node having clocks that are not synchronized with each other includes a continuous synchronisation session and a measurement session. The method repetitively sends predetermined synchronization messages from the first node to the second node and from the second node to the first node, calculates a round trip time for each message at the first node, updates a synchronization point if the calculated round trip time is smaller than a previously calculated round trip time, stores the updated synchronization points of a synchronization window, and calculates a virtual clock from the updated synchronization points of the synchronization window. The measurement session collects multiple measurements of one-way latency between the first and second nodes using the virtual clock, and generates a latency profile by interpolating the multiple measurements. | 02-27-2014 |
20140056319 | High Precision Timer in CPU Cluster - A system includes a first node that generates a first clock signal having a frequency, generates a plurality of data packets, modifies the data packets to include data indicative of time and phase information associated with the first node, and transmits the data packets. A second node receives the plurality of data packets and the first clock signal, determines the time and phase information based on the plurality of data packets, determines the frequency based on the first clock signal, and generates at least one of a second clock signal and a local time based on the time and phase information and the frequency of the first clock signal. | 02-27-2014 |
20140079077 | COMMUNICATION SYSTEM USING LOW BANDWIDTH WIRES - A high frequency signal is down-converted into an intermediate frequency signal, transmitted over a limited bandwidth medium from a master unit to a remote unit and up-converted back into its original high frequency at the remote unit. The up-conversion is aided by reconstruction of a reference signal embedded at the master unit as a carrier for a management signal which is transmitted to the remote unit through the same limited bandwidth medium together with the intermediate frequency signal. The reference signal is reconstructed using a phase locked loop which includes a charge pump and is kept stable during intervals between bits and messages by a charge pump shutter. | 03-20-2014 |
20140086266 | LTE-Advanced Primary Synchronization Signal Detection - Various embodiments of primary synchronization signal detection are provided. In one aspect, a method receives one or more signals at one or more antennas of a receiver. The method processes the one or more received signals by decimation filtering the one or more received signals to provide one or more decimated signals, each of the one or more decimated signals having a predetermined symbol size, and enumerating correlation of the one or more decimated signals with a plurality of reference signals to provide correlation results. The method then detects a primary synchronization signal (PSS) based on the correlation results. | 03-27-2014 |
20140092922 | AUTOMATIC CAPTURE OF THE NETWORK DELAY COMPONENTS - In a method for monitoring the residence time across nodes of a communication network including a transparent clock-based synchronization architecture, the method includes configuring and generating a tunable and traceable packet dedicated to delay measurements. The method further includes measuring the packet resident time across a network node by a transparent clock, storing, at the level of the network node, the measured residence time, and retrieving the stored residence time by a Network protocol. | 04-03-2014 |
20140092923 | DELAY MEASUREMENT IN A POINT TO MULTIPOINT SYSTEM - A system and method for measuring a propagation delay in a point to multipoint network. The system includes a central timing module which provides a timing signal to a plurality of line cards. Each of the line cards includes a local clock that is frequency locked to a 1588 clock and is configured to generate a return timing signal to the central timing module after a predetermined number of clock cycles. The central timing module measures the propagation delay based on the clock cycles of the local clock counted before the return signal is generated and the period of the local clock. | 04-03-2014 |
20140119389 | INTERFACE FOR ASYNCHRONOUS VIRTUAL CONTAINER CHANNELS AND HIGH DATA RATE PORT - Data rate justification circuitry adapted to control one or more communications between a physical layer device and a link layer device. In a first direction of communication, the data rate justification circuitry is configured to receive first virtual container data from the physical layer device over two or more asynchronous virtual container channels, and to synchronize the first virtual container data and aggregate the first virtual container data for transmission to the link layer device over a high data rate port. In a second direction of communication, the data rate justification circuitry is configured to receive second virtual container data from the link layer device over the high data rate port, and to decode data rate information associated with the second virtual container data and separate the second virtual container data for transmission to the physical layer device over the two or more asynchronous virtual container channels. | 05-01-2014 |
20140119390 | Method and Device for Assessing the Performance of One or More Packet Synchronization Services in a Packet Data Transmission Network - A method for assessing the performance of packet synchronization services in a packet data transmission network. The method includes, at a packet data transmission network probing point, determining at least two synchronization quality describing or influencing parameters based on at least one of a digital timing signal (Sp) received, the recovered time information for at least one timing parameter transmitted into the packet data transmission network, and parameters having impact on the synchronization quality and describing or controlling properties of hardware components present at a receiving network node. The method also includes, at the packet data transmission network probing point, determining a value of at least one synchronization performance score based on the at least two synchronization quality describing or influencing parameters. | 05-01-2014 |
20140153588 | METHODS AND APPARATUS FOR PRECISION TIME STAMPING - In a network device, apparatus and methods perform precision time stamping. A time agent receives a master pace signal corresponding to a time representation based on a master real time clock in a master clock domain. A time accumulator accumulates time units one fill quantum at a time based on the master pace signal. The time accumulator decreases the accumulated time units by a leak quantum according to a local clock signal running at a higher frequency than the master pace signal. Correction logic periodically generates, at a granularity corresponding to the frequency of the local clock signal, an updated time representation in a target clock domain based on a residual number of time units in the time accumulator before depositing an additional fill quantum of time units in the time accumulator. | 06-05-2014 |
20140161143 | Clock Synchronization Using Multiple Network Paths - A packet transmitted by a master clock via a network is received via a port of a network device. The packet includes a time stamp from the master clock. It is determined via which one of a plurality of communication path in the network the packet was received. An application layer module of the network device uses (i) the time stamp in the packet and (ii) the determination of the communication path to determine time information. | 06-12-2014 |
20140177653 | Inband Timestamping - Embodiments are directed to timing synchronization between network nodes, such as, for example, based upon IEEE 1588. Example embodiments provide for a node in a IEEE 1588 message exchange to obtain the T3 timestamp without using its host interface to access the physical layer. Methods and systems include aspects of determining an egress timestamp corresponding to a time at which a first packet is transmitted from a physical interface of a first network entity on to a network media, storing the egress timestamp in a memory associated with the physical interface, receiving a second packet at the physical interface, retrieving the egress timestamp from the memory based upon the second packet, and updating the second packet with the retrieved egress timestamp. Embodiments may further include providing the updated second packet for protocol processing in the first network entity, or transmitting the updated second packet from the physical interface on to a network media. | 06-26-2014 |
20140177654 | METHOD, A COMPUTER PROGRAM PRODUCT, AND A CARRIER FOR INDICATING ONE-WAY LATENCY IN A DATA NETWORK - Disclosed herein is a method, a computer program product, and a carrier for indicating one-way latency in a data network (N) between a first node (A) and a second node (B), wherein the data network (N) lacks continuous clock synchronization, comprising: a pre-synchronisation step, a measuring step, a post-synchronisation step, an interpolation step, and generating a latency profile. The present invention also relates to a computer program product incorporating the method, a carrier comprising the computer program product, and a method for indicating server functionality based on the first aspect. | 06-26-2014 |
20140185632 | Network and Method for Implementing a High-Availability Grand Master Clock - In a network based on IEEE 1588, comprising a plurality of nodes ( | 07-03-2014 |
20140192826 | UNIVERSAL ASYMMETRY COMPENSATION FOR PACKET TIMING PROTOCOLS - The notion of a “PTP aware” path is one current proposed approach to reduce asymmetry effects. In a fully PTP aware path there is the notion of on-path support mechanisms such as boundary clocks and transparent clocks at every switching or routing node. However, on-path support methods only address time-transfer errors introduced inside network elements and any asymmetry in the transmission medium, such as, for example, the fiber strands for the two directions of transmission, cannot be compensated for by on-path support mechanisms. Furthermore, in a real operational network, which may traverse different operational domains administered by different entities, full on-path support is a difficult challenge. In certain managed network scenarios full on-path support can be contemplated. Nevertheless, the universal asymmetry compensation method described herein mitigates the asymmetry in a network path, without requiring on-path support mechanisms such as transparent clocks and boundary clocks. | 07-10-2014 |
20140211816 | SYSTEM AND A METHOD FOR IDENTIFYING A POINT IN TIME OF RECEIPT OF A DATA PACKET - A de-serializer, such as forming part of a SERDES, in which a point in time of receipt, on the serial data path, of receipt of a particular part of a data packet, such as an SOF, is determined from when that part is output on the parallel data path from knowledge of the clock controlling the parallel data path as well as which of the parallel lanes the part is output on. | 07-31-2014 |
20140233590 | TIME CONTROL DEVICE, TIME CONTROL METHOD, AND PROGRAM - The present disclosure relates to a time control device, a time control method, and a program that can synchronize time information with a master device in a network with high precision. | 08-21-2014 |
20140247839 | TIME SYNCHRONIZATION IN DISTRIBUTED NETWORK TESTING EQUIPMENT - The invention relates to time synchronization between network testing elements in distributed network monitoring and testing systems, and provides a method for synchronizing packet timestamps generated by a network probe with a free running clock to a master clock connected at a different location of the network. In one implementation, the probe eavesdrops on a PTP message exchange between the master and a remote slave device, recording message reception times according to it free running clock and transmitting relevant timing information to a rest server for determining the probe clock offset and updating the probe packet timestamps. | 09-04-2014 |
20140269776 | DISTRIBUTED FRAGMENT TIMESTAMP SYNCHRONIZATION - A fault tolerant video streaming distribution service utilizes multiple distribution servers to receive and process a video stream simultaneously. Each distribution server performs a mapping of each encoded timestamp associated with a transport stream having time discontinuities to a continuous time sequence. The distribution servers coordinate the timestamp mapping through a distributed leader election protocol that elects a leader to coordinate the timestamp mapping in an environment where failures are anticipated and the number of distribution servers dynamically changes without notice. | 09-18-2014 |
20140269777 | RESYNCHRONIZATION OF PASSIVE MONITORING OF A FLOW BASED ON HOLE DETECTION - Embodiments are directed towards resynchronizing the processing of a monitored flow based on hole detection. A network monitoring device (NMD) may be employed to passively monitor flows of packets for a session between endpoints. The NMD may receive copies of the monitored flow and perform processes on the monitored flow. In some situations, some copies of packets may not be fully processed by the NMD, creating a hole in the processing. If a hole is detected in the monitored flow and the processing of the monitored flow is desynchronized, then the NMD may suspend processing until it is resynchronized or for a remainder of the session. If the processing is desynchronized, then the NMD may resynchronize the processing by resuming the processing of the monitored flow at a downstream position of the monitored flow based on the detected hole. | 09-18-2014 |
20140269778 | METHODS TO ACHIEVE ACCURATE TIME STAMP IN IEEE 1588 FOR SYSTEM WITH FEC ENCODER - Systems and methods and systems are disclosed for allowing the medium access control (MAC) layer in a communication system within an integrated circuit or device to accurately determine a timestamp point and a timestamp value when, for example, the Precision Time Protocol (PTP) protocol is in use by the communication system. Such determination of accurate timestamp point and timestamp value may be used by the communication system to account for and to compensate for the time shift(s) from forward error correction (FEC) sublayer changes in a data frame that is transmitted by the MAC layer. Feedback is provided to the MAC from the FEC to allow the MAC to accurately determine the timestamp point and timestamp value align preamble of the data frame to the beginning of the FEC bit block that is output by the FEC sublayer. | 09-18-2014 |
20140286357 | MANAGED TIMING ENGINE - A Managed Timing Engine (MTE) provides a primary timing output synchronized to a selected input reference from a multiplicity of input references. Additional timing outputs can be generated such that there is a programmable frequency offset (in ppb) between them and the main output. The rate (in Hz) of the outputs can be programmable. The MTE can introduce a programmable delay for periodic phase references. | 09-25-2014 |
20140294021 | Method of Routing Synchronization Messages - A method of routing synchronization messages in a packet communication network, in which a packet is routed using a global routing table. A piece of equipment in the network implements the following steps: detecting a packet carrying a synchronization message in a packet stream; determining an output port; emitting a packet carrying the message at the determined output port, the message being modified using a piece of information representing a time of transit in the equipment. A synchronization routing table, which stores at least one association between an input port and at least one output port, is configured in the equipment. When the packet carrying the received message indicates a routing needs to be carried out using the synchronization table, the output port for this packet is determined by the equipment according to an input port on which the packet is received and by reading the synchronization table. | 10-02-2014 |
20140294022 | SYSTEM FOR ESTABLISHING AND MAINTAINING A CLOCK REFERENCE INDICATING ONE-WAY LATENCY IN A DATA NETWORK - A method for indicating one-way latency in a data network, with continuous clock synchronization, between first and second node having clocks that are not synchronized with each other includes a continuous synchronisation session and a measurement session. The method repetitively sends predetermined synchronization messages from the first node to the second node and from the second node to the first node, calculates a round trip time for each message at the first node, updates a synchronization point if the calculated round trip time is smaller than a previously calculated round trip time, stores the updated synchronization points of a synchronization window, and calculates a virtual clock from the updated synchronization points of the synchronization window. The measurement session collects multiple measurements of one-way latency between the first and second nodes using the virtual clock, and generates a latency profile by interpolating the multiple measurements. | 10-02-2014 |
20140294023 | METHOD AND DEVICE FOR SYNCHRONIZING AN APPARATUS CONNECTED TO A COMMUNICATIONS NETWORK - A method of synchronizing an equipment unit ( | 10-02-2014 |
20140321481 | METHOD FOR TIME SYNCHRONIZATION IN A COMMUNICATION NETWORK - A method for time synchronization in a communication network comprising a multiplicity of network nodes, wherein synchronization messages are transmitted in the communication network and the synchronization message received in a slave node contains synchronization information for synchronizing the slave time of the slave node with the master time, i.e., synchronization messages are transmitted in a closed ring or line topology and the slave node receives first and second synchronization messages from different transmission directions, and wherein the slave node synchronizes a first time with the synchronization message from one transmission direction and a second time with the synchronization message from the other transmission direction. | 10-30-2014 |
20140348181 | TIME SYNCHRONIZATION BETWEEN NODES OF A SWITCHED INTERCONNECT FABRIC - A data processing node includes a local clock, a slave port and a time synchronization module. The slave port enables the data processing node to be connected through a node interconnect structure to a parent node that is operating in a time synchronized manner with a fabric time of the node interconnect structure. The time synchronization module is coupled to the local clock and the slave port. The time synchronization module is configured for collecting parent-centric time synchronization information and for using a local time provided by the local clock and the parent-centric time synchronization information for allowing one or more time-based functionality of the data processing node to be implemented in accordance with the fabric time. | 11-27-2014 |
20140348182 | TIME SYNCHRONIZATION BETWEEN NODES OF A SWITCHED INTERCONNECT FABRIC - A data processing node includes a local clock, a slave port and a time synchronization module. The slave port enables the data processing node to be connected through a node interconnect structure to a parent node having time-based functionality thereof that is operating in accordance with a fabric time of the node interconnect structure. The time synchronization module is coupled to the local clock and the slave port. The time synchronization module is configured for engaging in a time synchronization message exchange sequence with a node connected to the slave port thereof to collect parent-centric time synchronization information and synchronizing operation of a central processing unit (CPU) structure of the data processing node with the fabric time using the parent-centric time synchronization information. | 11-27-2014 |
20140348183 | DATA SYNCHRONIZATION APPARATUS - Provided is a data synchronization apparatus. The data synchronization apparatus includes a signal conversion block converting individual serial digital signals into parallel digital signals in response to a load signal and converting the parallel digital signals into synchronized serial digital signals in response to a synchronization load signal which does not overlap the load signal, a clock/load signal generator outputting a reference load signal for generating the synchronization load signal to the signal conversion block, a multiplexer multiplexing the synchronized serial digital signals, and a first serial-to-parallel (S/P) converting the multiplexed signal into parallel signals. | 11-27-2014 |
20140348184 | APPARATUS AND METHOD FOR SYNCHRONIZED TRANSMISSION OF MULTIMEDIA CONTENT OVER AN ASYNCHRONOUS NETWORK - An apparatus includes a receiver ( | 11-27-2014 |
20140348185 | METHOD AND SYSTEM FOR CROSS-PROTOCOL TIME SYNCHRONIZATION - Methods and systems for cross-protocol time synchronization may comprise, for example, in a premises-based network, receiving a signal that conforms to a data over cable service interface specification (DOCSIS) communications protocol. A global time of day (GTOD) clock may be extracted from the received signal. Communication on the premises-based network in accordance with a multimedia over cable alliance (MoCA) communications protocol may be synchronized based at least in part on the extracted GTOD clock. Communication in a third communications protocol may be synchronized, wherein the third communications protocol may include a home phoneline networking alliance (HPNA) standard, an IEEE 802.11x standard, and a non-public wireless network protocol. The extracted GTOD clock may comprise a GPS clock, GLONASS clock, and a Galileo clock. A second signal for extracting a GTOD may be received, such as a satellite signal, and may conform to a low Earth orbit satellite signal protocol. | 11-27-2014 |
20140376569 | MULTIPLE CLOCK DOMAINS IN NOC - Example implementations described herein are directed to a micro-architecture of NoC router clocking which allows for a flexible Globally Asynchronous Locally Synchronous (GALS) implementation. The example implementations allow arbitrary clock domain partitions to be defined across the system. The example implementations further involve allowing the components of the NoC to be configured by the user through a NoC generation system to achieve the desired arbitrary clock domain partitioning. | 12-25-2014 |
20150010022 | Global synchronization method and system based on packet switching system - A global synchronization method based on a packet switching system includes that: a reference chip is selected; and each chip calibrates its own timer by taking the reference chip as a reference, wherein each chip sends a zero-point pulse or zero-point pulse cell to each high-speed link (serdes) connected with the chip, and feeds back a calibration cell in response to a zero-point pulse or zero-point pulse cell received through each high-speed link. Accordingly, a global synchronization system based on a packet switching system is also disclosed. The disclosure reduces the packet loss rate and increases the accuracy of calibration. | 01-08-2015 |
20150016476 | METHOD AND SYSTEM FOR OPTIMIZING SHORT TERM STABILITY OF A CLOCK PULSE - A system for optimizing short-term stability of a clock source clock pulse synchronized with a long-term stable reference-clock transmits clock numbers of a first reference clock to the clock source, between an initialization time and several times within a data-packet network. The clock pulse is adjusted by controlling a difference between clock numbers of the first reference clock received in the clock source and clock numbers of the first reference clock between the initialization time and the reception times of the clock numbers of the first reference clock. Clock numbers of a second reference clock are transmitted to the clock source with the clock number of at least one second reference-clock source at individual times. The maximum difference between the first and the second reference clock is known. The difference between the clock pulse of the clock source and each second reference clock is limited to an adjustable threshold value. | 01-15-2015 |
20150016477 | NETWORK SYSTEM AND METHOD OF SYNCHRONIZING PATH INFORMATION - The network system has a switch and a controller. The switch performs processes of a received packet in accordance with a flow entry in which are defined a rule and an action to uniformly control a packet as a flow. The controller transmits a control message to the switch to perform a setting of the flow entry, holds a flow entry identical to the flow entry set to the switch, manages a synchronization state per unity of a flow entry and preferentially synchronizes, in a case the flow entry is not synchronized, a specific flow entry between the switch. | 01-15-2015 |
20150030037 | METHOD OF CARRYING OUT SYNCHRONIZATION TRACKING AND A WIRELESS DEVICE USING THE SAME - There are provided a method of carrying out synchronization tracking and a wireless device using the same. The wireless device receives CSI-RS (Channel Status Information-Reference Signal) setting for prescribing the CSI-RS from a base station, and TRS (Tracking Reference Signal) setting for prescribing the TRS from the base station. The wireless device tracks the synchronization based on the TRS. | 01-29-2015 |
20150036698 | COMMUNICATION SYSTEM, TRANSMISSION DEVICE, AND RECEPTION DEVICE - In a DSTBC system, to obtain a communication system capable of estimating a transmission path without reducing a transmission capacity. The communication system includes a transmission device and a reception device that perform communication in the DSTBC system, in which the transmission device performs, as a start symbol of DSTBC, the start symbol including known signals one of which has signal power and the other of which are set to signal power of zero and transmits the known signals to the reception device, and the reception device independently estimates a transmission path between each of transmitting antennas of the transmission device and a receiving antenna of the reception device itself by using the space-time coded start symbol received from the transmission device, and decodes a reception signal with DSTBC decoding employing synchronous detection. | 02-05-2015 |
20150049774 | MESSAGE PROCESSING METHOD OF GATEWAY - The present invention provides a message processing method of a gateway, which can improve the reliability of a routing operation of the gateway by changing the moment of message transmission. The message processing method of the gateway includes steps of (a) calculating a time difference between the transmission time of a message transmitted to the gateway and the transmission time of a message routed and transmitted from the gateway, and (b) comparing the transmission period of the message transmitted to the gateway and the transmission period of the message routed and transmitted from the gateway, when the time difference is less than a target value. (c) A message transmission timing offset is calculated according to the compared result between the transmission periods of the messages, and (d) the transmission time of the message transmitted to the gateway is changed and corrected using the message transmission timing offset. | 02-19-2015 |
20150055662 | INTERNET GROUP MANAGEMENT PROTOCOL (IGMP) LEAVE MESSAGE PROCESSING SYNCHRONIZATION - Embodiments relate to synchronizing Internet Group Management Protocol (IGMP) leave processing in a system. One embodiment includes a system with a first access switch, a first virtual switch having a first timer, and a second virtual switch having a second timer. The first virtual switch and the second virtual switch are connected with the first access switch. The first access switch transmits an IGMP leave message to the first virtual switch. The first virtual switch transmits a synchronization message to the second virtual switch. The second virtual switch updates the second timer based on receiving the synchronization message. | 02-26-2015 |
20150071308 | System And Method For Monitoring Network Synchronization - Systems and methods are disclosed for monitoring network synchronization. The disclosed embodiments utilize time window snapshots to capture network time information and compare the captured time information against time reference information to determine network time errors. These network time errors can then be analyzed with respect to selected operating parameters and tolerances to determine network synchronization errors and to generate alarms. Certain embodiments are configured to capture time information data and to analyze this captured data locally to determine time error data. Certain other embodiments are configured to utilize multiple capture devices and to transmit time error data to a central snapshot synchronization monitor. The central snapshot synchronization monitor can also communicate control information to the capture devices to control the snapshot time windows. In addition, synchronization errors can be used as trigger events to cause additional capture of time information by other capture devices. | 03-12-2015 |
20150071309 | METHOD AND DEVICES FOR FREQUENCY DISTRIBUTION - This invention relates to methods and devices for frequency distribution based on, for example, the IEEE 1588 Precision Time Protocol (PTP). Packet delay variation (PDV) is a direct contributor to the noise in the recovered clock and various techniques have been proposed to mitigate its effects. Embodiments of the invention provide a mechanism to directly measure and remove PDV effects in the clock recovery mechanism at a slave clock. One particular embodiment provides a clock recovery mechanism including a phase-locked loop (PLL) with a PDV compensation feature built-in. An aim of the invention is to enable a slave clock to recover the master clock to a higher quality as if the communication path between master and slave is free of PDV. This technique may allow a packet network to provide clock synchronization services to the same level as time division multiplexing (TDM) networks and Global Positioning System (GPS). | 03-12-2015 |
20150078404 | System, Method and Apparatus for Time-Sensitive Energy Efficient Networks - System, method and apparatus for time-sensitive energy efficient networks. When a network device transitions from an active mode to a low power idle (LPI) mode, refresh signaling periods can be used to communicate time synchronization information between link partners. The passage of time synchronization information in a non-packet form enables the link partner to perform an action associated with a time-sensitive network application upon transitioning of the link partner from the low power idle mode to the active mode. | 03-19-2015 |
20150092793 | METHOD AND DEVICES FOR SYNCHRONIZATION - This invention relates to methods and devices for time and frequency synchronization. The invention has particular application where time and frequency synchronization over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP) is being carried out. The primary challenge in clock distribution over packet networks is the variable transit delays experienced by timing packets, packet delay variations (PDVs). Embodiments of the invention provide a method for time offset alignment with PDV compensation where a synchronized frequency signal is available at a slave device via Synchronous Ethernet and is used to determine the compensation parameters for the PDV. | 04-02-2015 |
20150092794 | METHOD AND DEVICES FOR COMPENSATING FOR PATH ASYMMETRY - This invention relates to methods and devices for compensating for path asymmetry, particularly with reference to time and frequency synchronization. The invention has particular application where time and frequency synchronization over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP) is being carried out. Typically communication path delays between a time server (master) and a client (slave) are estimated using the assumption that the forward delay on the path is the same as the reverse delay. As a result, differences between these delays (delay asymmetries) can cause errors in the estimation of the offset of the slave clock from that of the master. Embodiments of the invention provide techniques and devices for compensating for path delay asymmetries that arise when timing protocol messages experience dissimilar queuing delays in the forward and reverse paths. | 04-02-2015 |
20150092795 | METHOD AND APPARATUS FOR DETERMINING CLOCK DESYNCHRONIZATION - Embodiments of the present invention provide a method and an apparatus for determining clock desynchronization. The method includes: detecting a cell with exceptional IN information or power information among all cells of base stations throughout a network according to network measurement data sent by a base station, and using the cell as a first cell, where the network measurement data includes interference and noise (IN) information or power information; and sorting the first cell according to different types of exceptions of the IN information or power information, so as to determine that one or more of the base stations throughout the network are in clock desynchronization. | 04-02-2015 |
20150124841 | ADAPTIVE OFFSET SYNCHRONIZATION OF DATA BASED ON RING BUFFERS - A method and apparatus for synchronizing operations between a first circuit and a second circuit is disclosed. The method involves writing receive data from the first circuit to a first ring buffer at a first rate. The first ring buffer has a fixed-length of buffer elements and respective read and write buffer pointers. The buffered receive data is read from the first ring buffer to the second circuit at a second data rate. The respective positions of the read and write buffer pointers are detected, and a relative position between the read and write pointers is dynamically adjusted to enforce at least a predetermined minimum spacing. The dynamic adjustment comprises selectively adding or deleting portions of the data to or from the ring buffer. | 05-07-2015 |
20150131682 | METHOD TO DETECT SUBOPTIMAL PERFORMANCE IN BOUNDARY CLOCKS - In one example embodiment, a method to detect suboptimal boundary clocks is described for a node in a communications network. The method can include determining a benchmark value for a clock in a node; generating a plurality of time correction parameters associated with a plurality of time corrections for the clock; determining whether the plurality of time correction parameters meets a predetermined criteria based on the benchmark value; and generating an alert if the plurality of time correction parameters meets the predetermined criteria. | 05-14-2015 |
20150139250 | SYNCHRONIZED NETWORK STATISTICS COLLECTION - A system, method, and computer program product are provided for collecting a snapshot of the statistics of a computer network. The devices of the network that provide the statistics synchronize their clocks to a time source. The statistics collector can request the devices to read their counters at a specified time. The counter values are stored and time-stamped on the devices. The statistics collector can later retrieve the stored counter values from the devices and correlate the statistics by the time-stamps. | 05-21-2015 |
20150139251 | TIME SYNCHRONIZATION ARCHITECTURE IN A NETWORK DEVICE - A method of generating timestamp information irrespective of a packet format include generating an egress timestamp corresponding to a time at which a first egress packet associated with a synchronization event is transmitted to a network medium; storing the egress timestamp in a memory based on an egress identifier; and transmitting a second egress packet associated with the synchronization event with the stored egress timestamp being included in the transmitted second egress packet for timing synchronization in the network medium. The method also includes receiving an incoming packet from the network medium; generating an ingress timestamp corresponding to a time at which the incoming packet is received; replacing an error detection field included in the incoming packet with an error detection tag; inserting the ingress timestamp into the error detection tag; and providing the incoming packet with the ingress timestamp to a processor for synchronization of a local clock. | 05-21-2015 |
20150295669 | MANAGING TIME OFFSET AND FREQUENCY DRIFT IN ASYNCHRONOUS DOCSIS REMOTE PHY NETWORK ENVIRONMENTS - An example method for managing time offset and frequency drift in asynchronous Data Over Cable Service Interface Specification (DOCSIS) Remote Physical layer (R-PHY) network environments is provided and includes receiving, at a first hardware device, time synchronization message from a remote second hardware device in the DOCSIS R-PHY network, determining a time difference between a first clock at the first hardware device and a second clock at the second hardware device from the time synchronization message; and re-stamping an event message based on the time difference. | 10-15-2015 |
20150304060 | DATA TRANSMISSION METHOD, DEVICE, AND SYSTEM - Embodiments of the present application disclose a data transmission method, device, and system, and belong to the field of communications technologies. The method includes: receiving and temporarily storing, by a first node device, a designated service group sent by a second node device; and when the first node device needs to forward multiple SAToP or CESoPSN service packets in the temporarily stored designated service group, determining, by the first node device, whether an asynchronous SAToP or CESoPSN service packet exists in the designated service group, and if yes, acquiring, by the first node device, an adjustment value for the asynchronous SAToP or CESoPSN service packet according to a preset rule, and adjusting the asynchronous SAToP or CESoPSN service packet according to the adjustment value, so that the multiple SAToP or CESoPSN service packets in the designated service group are transmitted synchronously. | 10-22-2015 |
20150312022 | LOW-POWER, LOW-LATENCY ARCHITECTURE FOR TELECOM AND DATACOM MULTIPLEXERS AND DEMULTIPLEXERS - Described herein are systems and methods for reducing power consumption, latency, and chip complexity in a datacom/telecom multiplexer and demultiplexer. Adding a high frequency analog domain data path around or in place of a standard digital core data path allows the elimination of the demultiplexing and multiplexing stages required to drop the data rate of data streams down to that required for a standard digital core. Latency is also reduced due to the higher operating frequency of sequential elements required for data operations. The digital core can be powered down when not in use, and can be activated when necessary. | 10-29-2015 |
20150318939 | RELAY DEVICE, RELAY METHOD, AND RELAY PROGRAM - A fixed delay time storage unit | 11-05-2015 |
20150318941 | METHOD FOR ROBUST PTP SYNCHRONIZATION WITH DEFAULT 1588V2 PROFILE - Exemplary methods for reducing sync time in a precision time protocol (PTP) network include receiving, by a first PTP slave port of a first network device, timing messages from a second PTP master port of a second network device. The methods include maintaining a PTP master clock based on timing information included in the timing messages received from the second network device via the first PTP port. The methods further include receiving, by a third PTP passive port of the first network device, timing messages from a fourth PTP master port of a third network device. The methods include determining the third PTP passive port is a protective passive port based on a stepsRemoved value of the third network device, and maintaining an auxiliary clock based on the timing information included in the timing messages received from the third network device via the third PTP port. | 11-05-2015 |
20150326332 | SYSTEM AND METHOD TO DYNAMICALLY REDISTRIBUTE TIMING AND SYNCHRONIZATION IN A PACKET SWITCHED NETWORK - Systems, methods, apparatuses, and computer program products for dynamically redistributing timing and synchronization in a packet switched network are provided. One method includes creating, by a slave node, a peer list comprising an identifier of at least one peer slave node that shares a same master node as the slave node or that has a certain predefined affinity with the slave node. The method may also include announcing a holdover time of the slave node to the at least one peer slave node, and, when a predefined event occurs, announcing to the at least one peer slave node that the slave node is taking on a mini-master role for at least the announced holdover time. | 11-12-2015 |
20150333899 | Synchronization Of Data Packets In A Data Communication System Of A Vehicle - Synchronizing data packets from an unclocked data communication network with a clocked data communication network includes: receiving clocked data packets in a gateway at clock cycles of the clocked network; packing data from the clocked data packets into first unclocked data packets for the unclocked data communication network in the gateway; providing the unclocked data packets with a time stamp, from which a clock cycle of a clocked data packet can be reconstructed; transmitting the first unclocked data packets via the unclocked network to a receiver node of the unclocked network; reading the time stamps out of the first unclocked data packets and reconstructing the clock cycle of the clocked network from the time stamps, a transmission frequency, a number of clocked data packets and/or a local clock in the receiver node; and transmitting second unclocked data packets in a clock cycle which is synchronous with the reconstructed clock cycle. | 11-19-2015 |
20150333996 | SUPPORTING EFFICIENT AND ACCURATE SYNC/FOLLOWUP TIMESTAMPS - In one embodiment, a physical (PHY) layer (lower protocol stack layer) of a device may add a timestamp to a received frame, and pass the frame and timestamp up the protocol stack toward a synchronization (sync) recognition layer (upper protocol stack layer). The sync recognition layer determines whether the frame relates to synchronization, and if so, places the timestamp into a data structure along with a frame association for recovery by followup processing. Conversely, in another embodiment, the sync recognition layer may add to a frame for transmission a frame ID having an indication of whether to timestamp the frame and may pass the frame and frame ID down the protocol stack toward the PHY layer. The PHY layer determines whether the frame ID indicates that the frame is to be timestamped, and if so, places a timestamp corresponding to frame transmission into a data structure with the frame ID. | 11-19-2015 |
20150334667 | TECHNIQUE FOR IMPROVING LDP-IGP SYNCHRONIZATION - A technique may improve LDP-IGP synchronization in a MPLS network when an interface of a router coupled to a communications link along a shortest path between a source router and a destination router becomes newly active. Specifically, an IGP adjacency may be held down over the newly active link while a LDP adjacency is established over the link. The router may inject a temporary, non-redistributable route having a large administrative weight into its routing table utilizing addresses learned during establishment of the LDP adjacency. The injected route ensures that there is a reachable route to a peer router so that LDP may converge. After LDP has converged and all needed label bindings have been distributed in the MPLS network utilizing the injected route, IGP executing on the router may advertise a normal cost metric for the link associated with the newly active interface, and IGP convergence may be completed. | 11-19-2015 |
20150341129 | AN AUTOMATIC CHECKING METHOD FOR CLOCK SYNCHRONIZATION AND SPECIALIZED APPARATUS THEREOF - The invention relates to an automatic checking method for clock synchronization, comprising the following steps: (1) regularly acquiring clock signals sent by a Beidou signal source, a GPS signal source and an SNTP signal source; (2) performing subtraction to the clock signals of the Beidou signal source and the GPS signal source and evaluating the absolute value of the difference; at the same time, performing subtraction to the clock signals of the Beidou signal source and the SNTP signal source and then evaluating the absolute value of the difference and finally judging the results of the two differences; and (3) constantly repeating steps (1) and (2). The operations in the present invention can efficiently avoid the problems in the existing technology, guarantee the consistency and accuracy of system time, and guarantee the stable and safe operation of the system and the normal operation of other power grid businesses. | 11-26-2015 |
20150365337 | SYSTEMS AND METHODS FOR PERFORMING A SOFT-BLOCK OF A QUEUE BASED ON A SIZE OF A REMAINING PERIOD OF A GUARD BAND - A network device including first and second queues, a determination module, a counter module, a comparison module and a blocking shaper. The determination module determines a size of the second frame. The counter module determines an amount of time remaining in a guard band and converts the amount of time to a size representative of the time remaining in the guard band. The guard band refers to a period of time leading up to a window. The first frame is scheduled to be forwarded from the first queue during the window. The comparison module compares the size of the second frame to the size representative of the time remaining in the guard band and generates a result based on the comparison. The blocking shaper, based on the result, determines whether to permit or block transmission of the second frame from the second queue during the guard band. | 12-17-2015 |
20150372802 | SOURCE SYNCHRONOUS BUS CLOCK GATING SYSTEM - Embodiments are described for a method of reducing power consumption in source synchronous bus systems by reducing signal transitions in the system. Instead of sending clock and data valid signals, only the start and end of valid data packets are marked by clock signal transitions, or only a number of clock pulses that corresponds to number of data words is sent, or only a number transitions on clock signals are sent. The clock signal transitions may comprise either clock pulses or exclusively rising edge or falling edge transitions of the clock signal. | 12-24-2015 |
20160006526 | SYSTEMS AND METHODS OF NETWORK CLOCK COMPARISON - A method includes receiving, at a first device, a packet from a second device. The method also includes detecting receipt of the packet at a detection circuit. The method further includes, in response to detecting the receipt of the packet, capturing a time of arrival timestamp corresponding to the packet at a capture circuit. The method also includes receiving, at the first device, a time of departure timestamp corresponding to the packet from the second device. The time of departure timestamp indicates a time when the packet is sent from the second device. The method further includes performing a comparison of the time of arrival timestamp and the time of departure timestamp. | 01-07-2016 |
20160007306 | SCHEME FOR TRANSMITTING AND RECEIVING SYMBOLS IN FILTER BANK MULTI CARRIER SYSTEM - Provided is a method for transmitting a transmission symbol in a transmitting device supporting a filter bank multi carrier (FBMC) scheme. The method includes generating a training symbol by including a training signal in at least one of an odd symbol and an even symbol constituting the training symbol; generating the transmission symbol by delay-overlapping the training symbol and at least one data symbol; and transmitting the transmission symbol. | 01-07-2016 |
20160020897 | USING THRESHOLDS TO GATE TIMING PACKET GENERATION IN A TRACING SYSTEM - In accordance with embodiments disclosed herein, there is provided systems and methods for using thresholds to gate timing packet generation in a tracing system (TS). For example, the method may include generating and outputting a trace data (TD) packet into a packet log. The method also includes generating and outputting a timing packet (TM) corresponding to the TD packet into the packet log when a number of clock cycles elapsed since an output of a previous TM packet exceeds a clock threshold value. | 01-21-2016 |
20160065322 | NODE AND METHOD FOR SELECTING SYNCHRONIZATION SOURCE - The disclosure relates to a node capable of selecting a first port to receive a first synchronization source in a system comprising a plurality of nodes. The node comprises a memory configured to memorize states of each port of the node in a corresponding tree. At least one tree is formed with ports of the plurality of connected nodes according to a second synchronization protocol. The node further comprises a first synchronization source selection unit configured to select the first port according to states of the ports of the node. The first synchronization source so selected will not form a loop in the network. There is also provided a method used in the node. | 03-03-2016 |
20160072603 | INTERFACE CIRCUIT FOR TRANSMITTING AND RECEIVING DIGITAL SIGNALS BETWEEN DEVICES - A video signal and an audio signal are TMDS transmitted from a source device to a sink device. Through a reserved line and a HPD line provided separately from a TMDS transmission line, an Ethernet™ signal is bidirectionally transmitted, and also, a SPDIF signal is transmitted from the sink device to the source device. The Ethernet™ signal bidirectionally transmitted between Ethernet™ transmitter/receiver circuits is differentially transmitted by an amplifier and is received by the amplifier. The SPDIF signal from a SPDIF transmitter circuit is common-mode transmitted from an adder and is received by the adder to be supplied to the SPDIF receiver circuit. | 03-10-2016 |
20160072604 | PROVIDING PACKET SYNCHRONIZATION IN A VIRTUAL PRIVATE NETWORK - A method and apparatus for providing packet synchronization in a Virtual Private Network. A node that provides backhaul service to a plurality of Service Providers in the Virtual Private Network receives a synchronization control packet. It identifies a characteristic relating to the identity of a Service Provider of the plurality of Service Providers, and provides synchronization information to the node on the basis of the identified characteristic. Subsequent packets associated with the identified Service Provider are handled using the synchronization information. | 03-10-2016 |
20160073365 | COMMUNICATION NETWORK NODES AND METHODS PERFORMED THEREIN - Determining a time synchronisation inaccuracy value between a first node and a second node. A PTP packet is received including Node IDs representing respective transport nodes along a first path, and from the second node Node IDs are obtained representing respective transport nodes along a second path. Furthermore, a first common node of the first path and the second path is determined. The time synchronisation inaccuracy value between the first node and the second node is calculated. By including Node IDs in received PTP packets before forwarding them to a node, the node is enabled to determine a first common node. Thereby, the node may calculate relative time inaccuracy values with respect to the other access network nodes, which may be used to decrease inaccuracy time synchronisation for co-ordination functions. | 03-10-2016 |
20160080782 | Employing Helper Transport Streams for Re-Multiplexing - In one system embodiment, a master re-multiplexer may be configured to receive an indexed transport stream, re-multiplex the indexed transport stream by performing a set of re-multiplexing operations, generate a helper transport stream, the helper transport stream comprising a description of the set of operations, wherein the set of operations comprises both program clock reference (PCR) re-stamping and inserting packets, and providing the helper transport stream over a communications network to plural remote re-multiplexers capable of identically re-multiplexing the indexed transport stream based on the helper transport stream. | 03-17-2016 |
20160112151 | SWITCH FOR TRANSMISSION OF DATA BETWEEN HETEROGENEOUS NETWORKS FOR AIRCRAFT - A data transmission switch configured to be carried onboard an aircraft comprises: at least one input configured to receive data from a flight management computer on a first transmission channel, the channel functioning in multidirectional mode; at least one output configured to transmit the data to at least one avionic equipment on a second transmission channel, the switch further comprising a transducer configured to generate instructions for synchronization of the second transmission channel. The invention enables retrofitting to aircraft with an old avionic system under very economic conditions. | 04-21-2016 |
20160119069 | Channel Bonding Synchronization - Different data communication architectures deliver a wide variety of content, including audio and video content, to consumers. The architectures employ channel bonding to deliver more bandwidth than any single communication channel can carry. In some implementations, the communication architectures distribute data streams to bonded channels that are clocked independently. A system is provided for synchronizing the bonded channels. | 04-28-2016 |
20160119070 | Time Correction Method and Apparatus for Slave Clock Device - Provided are a time correction method and a time correction apparatus for a slave clock device. The method is applied to a slave clock device, wherein the method includes: acquiring background traffic information, in a running process, of the slave clock device; acquiring a deviation correction value according to the background traffic information and a fitted function reflecting delay on an asymmetric link; and correcting a synchronization time, which is output from the slave clock device, in real time according to the deviation correction value. With the above technical solution, the technical problem in related art that there is no technical solution for effectively eliminating a dynamic delay change of an asymmetric link due to a background traffic change is solved, thereby greatly reducing the impact of the traffic change on the asymmetric link delay. | 04-28-2016 |
20160119169 | APPARATUSES AND METHODS FOR ADDING OFFSET DELAYS TO SIGNAL LINES OF MULTI-LEVEL COMMUNICATION ARCHITECTURES - Apparatuses and methods for adding offset delays to signal lines of multi-level communication architectures are disclosed herein. An example method may include comparing a current channel state of a channel of a multi-level communication bus with a next channel state of the channel. The example method may further include, based on the comparison, applying an offset delay to a control signal configured to control transition of a signal line of the channel from a value associated with the current channel state to a value associated with the next channel state. The example method may further include after application of the offset delay, driving the signal line to the value associated with the next channel state responsive to the control signal. | 04-28-2016 |
20160127067 | METHOD FOR OPERATING A NODE OF A COMMUNICATIONS NETWORK, A NODE AND A COMMUNICATIONS NETWORK - A method for operating a node in a communications network comprises the following steps: The node receives a reference time via the communications network. A transmit clock of the node, which was determined for an earlier clock cycle on the basis of a local clock of the node, is compared with the reference time. The local clock of the node is corrected on the basis of the comparison result. On the basis of the corrected local clock a transmit clock is determined to be used by the node for the current clock cycle. | 05-05-2016 |
20160134387 | COMMUNICATION SYSTEM, COMMUNICATION SYSTEM CONTROL METHOD, TRANSMISSION DEVICE, AND RECEPTION DEVICE - A counter is synchronized with a counter within a communication device and measures, as a first count value, a timing before a PTP packet is input to a processing unit that performs processing on the PTP packet. A multiplexing unit multiplexes the first count value into the PTP packet. The counter measures, as a second count value, a timing when processing by a processing unit that performs processing on the PTP packet is completed. A count extraction unit extracts the first count value from the PTP packet. A modification unit modifies a correction field by calculating a modification value based on the second count value, the first count value, and a value of the correction field within the PTP packet, the value of the correction field indicating a total amount of delay in a relay device. | 05-12-2016 |
20160142167 | An Apparatus and a Method for Determining a Point in Time - Forwarding points in time of a clock over a clock boundary is performed by launching the points in time into a buffer, such as a FIFO, in the first clock domain. The oldest point in time is fed into a FIFO or delay line in the other clock domain, which FIFO or delay line comprises a plurality of received points in time, which are shifted through the FIFO or delay line over time. An estimate of a point in time in the second clock domain is derived from a plurality of the points in time in the delay line/FIFO, such as from a mean value thereof. This point in time may be compensated for a known delay in order for this determined point in time to be identical to or close to an actual point in time of the first clock in the first clock domain. | 05-19-2016 |
20160142168 | METHOD FOR THE CLOCK SYNCHRONIZATION OF A PLURALITY OF MODULES - A method or an arrangement for the clock synchronization of a plurality of distributed modules of an information or communication system where said modules are coupled via a packet-switched network is adapted so that at least two of said modules are controlled by a local clock generator of the modules using an adjustable frequency, and a clock signal is transmitted via the network in the form of clock signal packets. One of said at least two modules takes over the function of a master module, and all remaining modules synchronize the local clock of the modules with the clock of the master module. | 05-19-2016 |
20160142993 | TIME SYNCHRONIZING METHOD FOR AVB IN VEHICLE AND SYSTEM THEREOF - Disclosed are a time synchronizing method under a vehicle AVB environment and a system using the same. An AVN, which communicates with at least one device which is provided in a vehicle and performs a predetermined operation under an Ethernet AVB environment, synchronizes the at least one device by receiving a RTC time information message in the form of a RTC protocol packet which applies an IP protocol. Therefore, various services which synchronize a plurality of devices in the vehicle are provided, to improve convenience of a driver. | 05-19-2016 |
20160149692 | METHOD AND APPARATUS FOR PROVIDING TIME SYNCHRONIZATION IN IN-VEHICLE ETHERNET COMMUNICATION NETWORK - A method for providing time synchronization in a node connected to an Audio Video Bridging (AVB) Ethernet communication network includes steps of receiving static announcement messages from adjacent nodes and constituting a static grandmaster table, reselecting a grandmaster with reference to the static grandmaster table when a synchronization message timer expires, and updating the static grandmaster table according to reselection of the grandmaster. The method may rapidly time synchronization in the Audio Video Bridging (AVB) Ethernet communication network and minimize network load. | 05-26-2016 |
20160156427 | CLOCK RECOVERY IN A PACKET BASED NETWORK | 06-02-2016 |
20160156458 | PRECISE TIME TAGGING OF EVENTS OVER AN IMPRECESE LINK | 06-02-2016 |
20160173295 | device and measuring method for ascertaining the internal delay time of a can bus connection unit | 06-16-2016 |
20160174178 | METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR RECEIVING A CLOCK SYNCHRONIZATION MESSAGE | 06-16-2016 |
20160182332 | METHOD, A COMPUTER PROGRAM PRODUCT, AND A CARRIER FOR INDICATING ONE-WAY LATENCY IN A DATA NETWORK | 06-23-2016 |
20160182339 | TIME SYNCHRONIZATION ARCHITECTURE IN A NETWORK DEVICE | 06-23-2016 |
20160191184 | TIME SYNCHRONIZATION FOR NETWORK TESTING EQUIPMENT - The invention relates to time synchronization between network testing elements in distributed network monitoring and testing systems, and provides a condensed PTP process wherein the number of timing messages exchanged between master and slave in one iteration of the time synchronization process is reduced. Furthermore, timing messages are encrypted to provide for a more secure synchronization process. One aspect of the method provides for an automatic detection and adaptive handling of protocol stacks of received timing packets. | 06-30-2016 |
20160191185 | Systems And Methods Utilizing Randomized Clock Rates To Reduce Systematic Time-Stamp Granularity Errors In Network Packet Communications - Systems and methods are disclosed for utilizing slave (receive) time-stamp clock rates that are different from master (sender) time-stamp clock rates to randomize and thereby reduce systematic time-stamp granularity errors in the communication of network packets. The slave (receive) time-stamp clock rate for some embodiments is set to be a fixed value that has a relationship with the master (sender) time-stamp clock rate such that the ratio of the slave (receive) clock rate to the master (sender) clock rate is a rational number. Other embodiments use a time-varying frequency for the slave (receive) time-stamp clock rate to randomize the slave (receive) time-stamp clock with respect to the master (sender) time-stamp clock. Additional time-stamps can also be generated using a slave (receive) time-stamp clock having a rate set to equal the rate of the master (sender) time-stamp clock signal. Further spread spectrum and/or delta-sigma modulation techniques can be applied to effectively randomize the slave (receive) time-stamp clock. | 06-30-2016 |
20160191229 | COMMUNICATION DEVICE AND COMMUNICATION METHOD - The present disclosure provides a communication device, including: a reception section that receives information relating to a reception timing at a reception side, which is transmitted from a transmission destination after a data frame is transmitted to the transmission destination; an information storage section that stores a transmission interval and the information relating to the reception timing for previous transmissions; a mismatch correction section that, in a case in which a new data frame is transmitted, calculates a correction amount for eliminating a mismatch in a transmission timing of a wakeup frame or a mismatch in a reception timing at which the transmission destination receives the wakeup frame, based on the transmission interval and the information relating to the reception timing; and a communication control section that determines the transmission or reception timing based on the information relating to the reception timing and the correction amount. | 06-30-2016 |