Class / Patent application number | Description | Number of patent applications / Date published |
398052000 | Time | 65 |
20080247754 | METHOD AND APPARATUS FOR ADJUSTING TIMESLOT FRAGMENTS OF MULTIPLE LINKS - A method and apparatus for adjusting timeslot fragments of multiple links in an Automatically Switched Optical Network (ASON). The method includes the steps of: obtaining link information of multiple links necessary for timeslot fragment adjustment, calculating adjusted link information of each link according to the link information, and adjusting a timeslot allocation of each link according to the adjusted link information. | 10-09-2008 |
20080292313 | Methods, Systems, and Computer-Readable Media for Ranging a Device in a Point-to-Multipoint Network - Methods, systems, and computer-readable media provide for ranging a device in a point-to-multipoint network. According to embodiments, a method for ranging a device in a point-to-multipoint network is provided. According to the method, a device identifier representing a drop in the point-to-multipoint network where the device is installed is received. The device identifier is associated with the device. The device identifier and a unique identifier associated with the device are transmitted over the point-to-multipoint network to a central unit for ranging the device in the point-to-multipoint network. | 11-27-2008 |
20080317465 | Method and System for Implementing Transport Service of Ngn - A method for implementing transport layer service of NGN, wherein the NGN includes a service layer and a transport layer, the method including: establishing an independent transport-layer control device in the control plane of the transport layer in the NGN network; establishing a transport connection in the user plane of the transport layer under the control of the transport-layer control device; bearing the NGN service through the transport connection. The present invention also discloses a system for implementing transport layer service of NGN. According to the present invention, the network design of NGN may be simplified, the cost of the transport layer network may be reduced, and a strict QoS guarantee for NGN services may be provided. | 12-25-2008 |
20090074410 | METHOD AND APPARATUS FOR SYNCHRONOUS CROSS-CONNECT SWITCHING IN OPTICAL TRANSPORT NETWORK - A method for synchronous cross-connect switching in optical transport network, the method includes: receiving optical channel transport unit (OTU) signals; mapping the OTU signals into interim switching units, wherein the interim switching units match bit rates of the received OTU signals; performing a synchronous cross-connect switching for the interim switching units; and demapping the interim switching units obtained after the synchronous cross-connect switching to obtain the OTU signals. | 03-19-2009 |
20090097848 | SHARING VALUE OF NETWORK VARIABLES WITH SUCCESSIVELY ACTIVE INTERFACES OF A COMMUNICATION NODE - A method includes storing a value of shared variables from an active member of a plurality of packet-to-tdm interfaces. Another member of the plurality of packet-to-tdm interfaces is selected to become active. The value of shared variables is provided to the selected member. | 04-16-2009 |
20090110397 | PREVENTION OF COLLISION FOR TIME DIVISION MULTIPLEXING OPTICAL NETWORK, APPARATUS AND METHOD THEREOF - An apparatus for preventing collision of upstream signals is provided. The apparatus is suitable for a time division multiplexing (TDM) passive optical network (PON). The apparatus includes an optical coupler device, an optic-electron converter (O/E), a control system, and an optical signal switch module. The O/E is coupled to the optical coupler device, the control system is coupled to the O/E, and the optical signal switch module is coupled to the optical coupler device and the control system. The optical coupler device receives a first optical signal and splits the first optical signal into a second optical signal and a third optical signal. The O/E converts the second optical signal into a first electrical signal. The control system generates a control signal according to the first electrical signal. The optical signal switch module determines whether to stop the third optical signal from passing the apparatus according to the control signal. | 04-30-2009 |
20090162061 | OPTICAL TRANSMISSION SYSTEM AND METHOD - An optical transmission system for performing frequency synchronization even with a client signal with low frequency accuracy, and for transmitting thereof by accommodating/multiplexing without causing a bit slip. A new overhead is added to the entire client signal, and the signal including the new overhead being stuffed is transmitted in conjunction with a plurality of stuffing bits as an optical signal wherein a data storing bit for a negative stuffing, a stuffing information notification bit, and a stuff bits inserting bit for a positive stuffing in the payload are defined in plurality as stuffing bits for adjusting clock frequencies of the client signal in this new overhead. | 06-25-2009 |
20090214208 | Balanced Bufferless Switch - A high capacity distributed switching system comprises electronic edge nodes connected to a balanced bufferless switch which may be electronic or optical. The balanced bufferless switch comprises a balanced connector and a switch fabric. The balanced connector comprises an array of temporally cyclic rotator units having graduated rotation shifts and each having a prime number of output ports. The switch fabric may be a mesh interconnection of switch modules. Due to the use of the balanced connector, establishing a path through the switch fabric requires at most a second-order time-slot matching process for a high proportion of connection requests with a much reduced need for a third-order time-slot matching process required in a conventional mesh structure. | 08-27-2009 |
20100183303 | OPTICAL PULSE GENERATING DEVICE AND OPTICAL SIGNAL PROCESSING DEVICE - An optical pulse generating device includes a continuous light input unit to which continuous light is input; a pulse input unit to which control pulse light that includes periodic pulses of light is input; and a generating unit that generates pulse light from the continuous light by clipping the continuous light according to a variation of emission intensity of the control pulse light. | 07-22-2010 |
20100221005 | METHOD FOR REALIZING TIME SLOT PARTITION AND SPENDING PROCESS OF AN OPTICAL PAYLOAD UNIT IN AN OPTICAL TRANSMISSION NETWORK - A method of time slot partitioning and overhead processing of an optical channel payload unit in OTN comprises: A. determining the number of time slots to be partitioned and mapping modes for the OPU based on properties of service signals; B. assigning reserved values of payload structure identification bytes in OPU overhead based on the partitioning of the time slots; and C. assigning values for reserved bits | 09-02-2010 |
20100316377 | ETHERNET TRANSMITTER APPARATUS - An optical transmitter apparatus capable of a transmission rate of at least 100 gbit/second comprises at least three input transmitters that each provide at an output an NRZ optical signal, at least two of the NRZ optical signals having substantially the same bit rate, each of the signals having a bit rate which is less than 100 Gbit/s and the sum of the bit rates of all of the at least three transmitters being at least equal to 100 Gbit/s, an NRZ to RZ converter associated with each transmitter which converts each NRZ signal into an optical RZ signal with the signal remaining in the optical domain during conversion, the optical RZ signal having the same bit rate as the corresponding NRZ signal, an optical time division multiplexer which converts the RZ signals into at least two further signals, one of the further signals being formed by bitwise interleaving the bits of the at least two of the RZ signals which have the same bit rate, and a polarisation multiplexer which processes the two further signals to provide two output signals of differing polarisation, each of the two output signals having the same bit rate as a respective one of the two further signals. The NRZ to RZ converters may be implemented using a SOA based device. | 12-16-2010 |
20110052191 | Modular High-Capacity Switch - A modular optical switch includes a set of optical switch modules connected in a mesh, a master controller for the whole optical node and a switch-module controller for each of the optical switch modules. The optical switch modules receive optical signals from, and transmit optical signals to, edge nodes based on connection requests received from the edge nodes. The master controller acts to select a path, using a simple or compound time-slot matching process, through the mesh of switch modules for each optical signal related to a connection request. Advantageously, the optical switch modules are fast switching, enabling the use of time-sharing schemes such as TDM, and the modular optical core node is made practical by efficient path selection at the master controller. A hybrid modular switch may include both optical and electronic switch modules, a master controller, and a switch-module controller for each of the switch modules. | 03-03-2011 |
20110150469 | OPTICAL TRANSMISSION DEVICE AND OPTICAL TRANSMISSION METHOD - There is provided an optical transmission device which includes a determiner, a convertor, and a switch. The determiner determines whether a frame includes a fixed stuff byte area or not when the frame is received from a first network, where the frame includes a payload area for storing client data and the fixed stuff byte area is for storing fixed data. When the determiner determines that the frame includes the fixed stuff byte area, a convertor to convert a fixed stuff byte area into the payload area and a switch switches a clock frequency from a first clock frequency used in the first network to a second clock frequency used in a second network when the frame including the converted fixed stuff byte area is output to the second network on the basis of the clock frequency as a reference. | 06-23-2011 |
20110182577 | METHOD, SYSTEM, AND APPARATUS FOR FILTER IMPLEMENTATION USING HERMITIAN CONJUGATES - Filter implementation using Hermitian conjugates and time division multiplexing (TDM) is disclosed to more efficiently compensate for chromatic dispersion of optical signals transmitted over a fiber optic medium. Embodiments for an input, filter, and output sections of a Digital Signal Processor (DSP) are described. The disclosed methods, and corresponding apparatus and systems enables a substantial reduction in the complexity of the hardware needed to implement CD compensation in the DSP. According to another embodiment, Inverse-Fourier transform circuits receive TDM data from the filter section and assemble the TDM data format back to a non-TDM format. | 07-28-2011 |
20110200332 | SHARED-SOURCE-ROW OPTICAL DATA CHANNEL ORGANIZATION FOR A SWITCHED ARBITRATED ON-CHIP OPTICAL NETWORK - A system including first and second sending nodes, a horizontal optical data link (ODL) having optical signals propagating in opposite directions in first and second waveguide segments, a vertical ODL having optical signals propagating in the same direction throughout third and fourth waveguide segments, a first optical output switch operatively connecting the first sending node and the first waveguide segment and configured to switch first data item onto the first waveguide segment during a first timeslot, a second optical output switch operatively connecting the second sending node and the second waveguide segment and configured to switch second data item onto the second waveguide segment during a second timeslot, and an optical coupler pair operatively connecting the first and second waveguide segments to the third and fourth waveguide segments, respectively, and redirecting the first and the second data items from the horizontal to the vertical ODL. | 08-18-2011 |
20120002965 | METHOD FOR DATA TRANSMISSION IN AN OPTICAL TRANSPORT NETWORK - It is disclosed a method for data transmission in an optical transport network, comprising the steps of
| 01-05-2012 |
20120057870 | METHOD, APPARATUS AND SYSTEM FOR TRANSMITTING AND RECEIVING CLIENT SIGNALS - The present invention provides a method, apparatus and system for transmitting and receiving a client signal. The method for transmitting a client signal includes, at the transmitting end, mapping a client signal to be transmitted to a corresponding low-order Optical Channel Data Unit (ODU) in a low-order ODU set, wherein low-order ODUs in the low-order ODU set having rates increased in order, and having rate correspondence relations with the client signals; mapping the low-order ODU to a timeslot of a high-order Optical Channel Payload Unit (OPU) in a high-order OPU set; and adding overheads to the high-order OPU to form an Optical Channel Transport Unit (OTU), and transferring the OTU to an Optical Transport Network (OTN) for transmission. | 03-08-2012 |
20120093506 | METHOD AND APPARATUS FOR REALIZING CROSS-CONNECT OF OPTICAL CHANNEL DATA UNIT-K - The present invention discloses a method for realizing cross-connect of optical channel data units (ODUk), which comprises: mapping the accessed services to the ODUk, and mapping the services mapped to the ODUk to the ODUk time slot frames according to the requirements of the time slot frames; mapping the ODUk time slot frames to the intermediate frame structures; performing the cross-connect for ODUk services in the intermediate frame structures. The present invention also discloses an apparatus for realizing cross-connect of ODUk. The present invention directly supports cross-connect of ODUk, so as to realize simple scheduling for the Optical Transport Network (OTN) services, and improve the resource utilization factor and the integration level. | 04-19-2012 |
20120106956 | GMPLS Signaling for Networks Having Multiple Multiplexing Levels - A method comprising the steps of receiving, with circuitry at a first node, a signal indicative of a request to set up an optical channel data unit label switched path between the first node and a second node in a network. Time slots for a plurality of types of signals to be transmitted from the first node to the second node are reserved, and a set up message is transmitted from the first node to the second node. The set up message identifies the plurality of signal types and the reserved time slots. The optical channel data unit label switched path is then provided between the first and second nodes. | 05-03-2012 |
20130039658 | Traffic Differentiation in a Transport Network - A Layer 1 transport network, such as an Optical Transport Network (OTN), transports traffic in Layer 1 data transport units. Traffic received at a node of the transport network is mapped to Layer 1 data transport units according to destination such that each Layer 1 data transport unit carries traffic for a particular destination of the transport network. The Layer 1 transport network can carry a plurality of different traffic types and the node can map the received traffic to Layer 1 data transport units according to destination and traffic type. Identification information can be added to an overhead section associated with the Layer 1 data transport unit to indicate at least one of: traffic type and destination of the traffic carried within the data transport unit. At a subsequent node, the Layer 1 data transport units are received and switched such that Layer 1 data transport units carrying traffic destined for other nodes bypass higher layer processing at the node and Layer 1 data transport units carrying traffic destined for the node are switched to a local output of the node. | 02-14-2013 |
20130045010 | COMMUNICATION LINE SWITCHING METHOD, COMMUNICATION APPARATUS, STATION-SIDE COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, AND CONTROL UNIT - In a communication system in which a station-side line terminal apparatus | 02-21-2013 |
20130077971 | RECEIVER, DATA IDENTIFYING AND REPRODUCING APPARATUS, PON SYSTEM, AND DATA IDENTIFYING AND REPRODUCING METHOD - An OLT that receives a signal in which transmission signals having a plurality of transmission rates are time-division multiplexed, as a received signal, and performs data reproduction by selecting reproduction data to be reproduced, among oversampled signals obtained by oversampling the received signal. The OLT includes a data-signal-information acquisition unit that acquires a transmission rate of a received signal targeted for a process of the data reproduction, a sampling frequency control unit that determines a sampling frequency to be used for the oversampling based on the transmission rate, and a sampling-clock generation unit that generates a clock signal having the sampling frequency determined by the sampling-frequency control unit, and performs the oversampling based on the clock signal. | 03-28-2013 |
20130259476 | TRANSMISSION METHOD AND NODE DEVICE - A transmission method for transmitting a lower-speed signal transmission frame using a node device in a network by accommodating the lower-speed signal transmission frame into time slots of a higher-speed signal transmission frame includes supplying, when a number of the time slots accommodating the lower-speed signal transmission frame is to be increased, the time slots to input numbers of a cross-connection part of the node device in accordance with an order of time slot numbers of the time slots; and re-establishing cross-connections where the input numbers are cross-connected to corresponding output numbers of the cross-connection part so that the cross-connections are prevented from crossing each other, wherein the input numbers input the time slots and the output numbers output the time slots. | 10-03-2013 |
20130259477 | METHOD AND SYSTEM FOR REDUCING THE RESOURCE UTILIZATION OF SWITCH FABRIC IN A SONET/SDH MULTIPLEXER BY SWITCHING DATA ON A TU LEVEL - The present invention relates to a method and apparatus for reducing the resource utilization of the switching fabric in a SONET/SDH multiplexer by switching data on a TU level instead of byte or column level. | 10-03-2013 |
20140079393 | REMOTE TIMING COMMUNICATIONS - A system, method, and optical switch for communicating timing. A determination is made whether one of a number of data streams are available. Packets are received at a remote node in response to determining one of the number of data streams is available. A timing characteristic of the at least one of the packets is associated with a tick of a reference clock. The tick of the reference clock is extracted utilizing the timing characteristic of the at least one of the packets. 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 for distributing. | 03-20-2014 |
20140199067 | METHOD TO RE-PROVISION BANDWIDTH IN P-OTN NETWORK BASED ON CURRENT TRAFFIC DEMAND - A method, comprises measuring, by circuitry of a computer system, a first bandwidth of data traffic of a transport path over a time period, the transport path passing through a plurality of nodes and conforming to a protocol using a number of time slots to allocate a second bandwidth to the transport path. The method further includes passing a signal, from the computer system to at least one of the nodes of the transport path, the signal including at least one instruction that when executed by circuitry of the at least one node causes a change to the number of time slots allocated to the transport path. | 07-17-2014 |
20140321852 | MODULAR HIGH-CAPACITY SWITCH - A modular optical switch includes a set of optical switch modules connected in a mesh, a master controller for the whole optical node and a switch-module controller for each of the optical switch modules. The optical switch modules receive optical signals from, and transmit optical signals to, edge nodes based on connection requests received from the edge nodes. The master controller acts to select a path, using a simple or compound time-slot matching process, through the mesh of switch modules for each optical signal related to a connection request. Advantageously, the optical switch modules are fast switching, enabling the use of time-sharing schemes such as TDM, and the modular optical core node is made practical by efficient path selection at the master controller. A hybrid modular switch may include both optical and electronic switch modules, a master controller, and a switch-module controller for each of the switch modules. | 10-30-2014 |
20140321853 | Network with a Fast-Switching Optical Core Providing Widely Varying Flow-rate Allocations - Multiple switch planes, each having meshed bufferless switch units, connect source nodes to sink nodes to form a communications network. Each directed pair of source and sink nodes has a first-order path traversing a single switch unit in a corresponding switch plane and multiple second-order paths each traversing two switch units in one of the remaining switch planes. To reduce processing effort and minimize requisite switching hardware, connectivity patterns of source nodes and sink nodes to the switch planes are selected so that each pair of source node and sink node connects only once to a common switch unit. Widely-varying flow rates may be allocated from each source node to the sink nodes. To handle frequent changes of flow-rate allocations, in order to follow variations of traffic distribution, a high-throughput scheduling system employing coordinated multiple scheduler units is provided in each switch plane. | 10-30-2014 |
20150071636 | HITLESS SERVICE IN A VARIABLE RATE OPTICAL TRANSPONDER - Methods and systems for variable rate control include determining a new communications rate in response to measured data traffic patterns. A receive change message is transmitted to a receiver that triggers the receiver to wait for an end of transmission (EoT) message and to set a new communications rate. A transmit change message is transmitted to a transmitter that triggers the transmitter to send the EoT message to the receiver, to set the new communications rate, and to send a start of transmission (SoT) message to the receiver before resuming data communications. | 03-12-2015 |
20150071637 | DATA PROCESSING METHOD, RELATED DEVICE, AND SYSTEM FOR OPTICAL TRANSPORT NETWORK - Embodiments of the present invention provide a data processing method, related device, and system for an optical transport network. The data processing method for the optical transport network includes: encapsulating service data into an optical payload unit; mapping the optical payload unit to an optical channel data unit; mapping the optical channel data unit to a payload area of an optical burst transport unit; performing electrical-optical conversion on the optical burst transport unit to form an optical burst transport unit; carrying the optical burst transport unit onto an optical timeslot of an optical burst channel; and transmitting the optical burst channel to a line. Technical solutions provided by the present invention can effectively simplify a data processing process and reduce a data processing delay. | 03-12-2015 |
20150139644 | OPTICAL DROP DEVICE, OPTICAL DROP METHOD, AND OPTICAL ADD DEVICE - An optical drop device includes: a clock extractor configured to extract a clock signal from a multi-channel optical signal that includes a plurality of optical signals having different optical frequencies; a pulse generator configured to generate a pulse signal that is synchronized with the clock signal; an optical inverse Fourier transform unit configured to transform the multi-channel optical signal into a time division multiplexing optical signal by using an inverse Fourier transform; and an optical switch configured to drop an optical signal that exists in a time slot to which the pulse signal is applied, from the time division multiplexing optical signal. | 05-21-2015 |
20150326346 | SYSTEM AND METHOD FOR SETTING DOWNSTREAM FORWARD ERROR CORRECTION CODE IN TIME DIVISION MULTIPLEXING PASSIVE OPTICAL NETWORK - Provided are a system and method for setting a downstream forward error correction code for a downstream frame which is transmitted from an optical line terminal to an optical network unit in a time division multiplexing passive optical network. A system for setting a downstream forward error correction code in a time division multiplexing passive optical network includes: an optical line terminal configured to change a downstream forward error correction (FEC) indication included in a downstream frame and set a downstream FEC indication counter included in the downstream frame to transmit the downstream frame; and an optical network unit configured to receive the downstream frame from the optical line terminal and synchronize an FEC setting of the optical network unit with the FEC setting of the optical line terminal as a result of detection of the downstream FEC indication and downstream FEC indication counter included in the downstream frame. | 11-12-2015 |
20150365168 | WIRELESS COMMUNICATION SYSTEM AND TRANSMITTER - In a wireless communication system, a transmitter that transmits data and a plurality of receivers wirelessly communicate with each other. The transmitter includes a first storage unit that stores first identification information of one of the receivers; a first communication unit that transmits the data; and a switching unit that switches a transmission destination of the data to another receiver having the first identification information stored in the first storage unit. The receiver includes a second storage unit that stores second identification information of a plurality of the transmitters; and a second communication unit that receives the data from the transmitter having the second identification information. Both the transmitter and the receiver store the first identification information and the second identification information to each other. | 12-17-2015 |
20150365193 | OTN SWITCHING SYSTEMS AND METHODS USING AN SDN CONTROLLER AND MATCH/ACTION RULES - A method and network include receiving a Time Division Multiplexing (TDM) connection; determining information in overhead of the TDM connection; and if match/action rules defined by controller exist for the TDM connection, establishing the TDM connection based on matching an associated rule in the match/action rules. A Software Defined Networking (SDN) controller is configured to receive a request from a node related to a new TDM connection in the network; determine one or more routes in the network for the new TDM connection; determine match/action rules for the one or more routes at associated nodes of the one or more nodes; if the one or more routes include at least two routes, determine a group table at associated nodes of the one or more nodes to distinguish between the at least two routes; and provide the match/action rules and the group table to the associated nodes. | 12-17-2015 |
20150365740 | TRANSMISSION APPARATUS AND TRANSMISSION METHOD - A transmission apparatus includes: a plurality of first devices; and a second device configured to output a data signal shared by the plurality of first devices and respective first clock signals to each of the plurality of first devices, and to control the plurality of first devices individually based on the respective first clock signals. | 12-17-2015 |
20150381513 | APPARATUS AND METHOD FOR MANAGING OTN TRAFFIC IN PACKET-CIRCUIT INTEGRATED TRANSPORT SYSTEM BASED ON MULTILAYER-INTEGRATED FABRIC SWITCH - Provided is an OTN traffic management method of a traffic management apparatus included in an OTN line card that accepts OTN traffic and transmits the OTN traffic to a multilayer-integrated fabric switch; or accepts traffic, in units of cells, from the multilayer-integrated fabric switch and transmits, to a network, the OTN traffic that the OTN line card generates. The OTN traffic management method includes restoring a received Interlaken packet to an OTN frame; adding an ITMOH that contains information about an ODU payload size to the OTN frame; converting the OTN frame, to which the ITMOH has been added, into to fabric cell by further adding a fabric overhead; and transmitting the fabric cell to the multilayer-integrated fabric switch. | 12-31-2015 |
20160006525 | CLIENT SIGNAL MAPPING CIRCUIT AND MAPPING METHOD - A client signal mapping circuit for accommodating a client signal in a transmission frame, including: a buffer unit configured to temporarily store the client signal; a buffer used amount monitoring unit configured to report a used amount of the buffer unit; a stuff processing determination unit configured to compare the used amount of the buffer unit with a predetermined reference value, and a pseudo random sequence signal and the comparison result; an overhead insertion unit configured to add an overhead to the client signal read from the buffer unit to form a transmission frame; and a reading control unit configured to perform control for reading the client signal from the buffer unit based on determination by the stuff processing determination unit. | 01-07-2016 |
20160007103 | Optical Channel Data Unit Service Transmission Apparatus and Method - The present invention relates to the field of communication transmission, and in particular, discloses an optical channel data unit service transmission apparatus and method. The switching apparatus includes a first ODU service processing unit, a timeslot allocating unit, a switching output port allocating unit, an Ethernet switching unit, and a second ODU service processing unit, and forwards an ODU service according to a timeslot mapping table and a frame period timeslot table corresponding to the ODU service. | 01-07-2016 |
20160007104 | APPARATUS AND METHOD FOR TRANSPORTING OPTICAL CHANNEL DATA UNIT ODU SERVICE - The present invention discloses an apparatus and a method for transporting an ODU service. The transport apparatus includes a first ODU service processing unit, a timeslot allocation unit, a switching output port allocation unit, an Ethernet switching unit, and a second ODU service processing unit, where a table of a mapping between output ports of the first ODU service processing unit and timeslots is determined according to a rate of an ODUflex frame carried in an obtained ODU service and the number of the output ports of the first ODU service processing unit, and the ODU service is forwarded, which resolves a problem in the prior art that an ODUflex frame cannot be transported by using the Ethernet switching unit, thereby ensuring that service congestion does not occur on a forwarding port of a sending apparatus, and improving transmission quality of a communications network. | 01-07-2016 |
20160036555 | ALL-OPTICAL TIME SLICE SWITCHING METHOD AND SYSTEM BASED ON TIME SYNCHRONIZATION - An all-optical time slice switching method based on time synchronization is provided. With the method, continuous data streams in an optical network are assembled to time domain periodic optical time slices and are transmitted in an asynchronous transmission mode. Network nodes obtain high precision synchronization time via a network and control optical switches to switch arriving optical time slices to a target port at precise time points periodically, therefore all-optical switching is implemented. When a connection request arrives, an available path, a wavelength and time slots to be occupied are calculated by a source node according to information on available time slots of the optical network, and the time slots are reserved by a connection management module. After the time slots are reserved, the source node send optical time slices carrying services periodically at reserved time slots. A destination node restores the optical time slices to the data streams. Compared with an existing switching technology, the all-optical time slice switching method has remarkable advantages that reliable and flexible all-optical switching at sub-wavelength granularity can be implemented without participation of all-optical buffers and all-optical logic apparatus. | 02-04-2016 |
20160043852 | HITLESS MULTI-CARRIER SPECTRUM MIGRATION METHOD AND APPARATUS - A hitless multi-carrier spectrum migration method and apparatus are disclosed. The method includes: obtaining a spectrum of a secondary carrier and a to-be-migrated carrier in a target carrier group from a network management system, and generating the secondary carrier according to the spectrum of the secondary carrier; sending a migration notification to a peer network device, and performing answer response to the migration notification from the peer network device, where the answer response is used to determine that network devices at both ends can perform spectrum migration; sending migration signaling to the peer network device; and receiving the migration signaling sent by the peer network device, and migrating, according to the migration signaling, overhead information and a service that are borne on the to-be-migrated carrier in the target carrier group to the secondary carrier. | 02-11-2016 |
20160056914 | OTN ADAPTATION FOR SUPPORT OF SUBRATE GRANULARITY AND FLEXIBILITY AND FOR DISTRIBUTION ACROSS MULTIPLE MODEM ENGINES - Systems and methods for Optical Transport Network (OTN) adaptation to provide sub-rate granularity and distribution include segmenting an OTN signal into N flows of cells with associated identifiers, based on tributary slots of the OTN signal, wherein N≧0, and wherein the cells do not include unallocated payload from the OTN signal; switching the cells to a scheduler; and scheduling, from the scheduler, the cells for a line side modem. | 02-25-2016 |
20160057078 | LOSSLESS ADJUSTMENT METHOD OF ODUFLEX CHANNEL BANDWIDTH AND ODUFLEX CHANNEL - The embodiments of the present invention relate to the field of communications technologies, and disclose a lossless adjustment method of ODUflex channel bandwidth and an ODUflex channel. The lossless adjustment method includes: respectively adjusting, according to bandwidth adjustment indication request information, a time slot occupied by an ODUflex frame in a higher order optical channel data unit at an egress side of each network node on an ODUflex channel; and adjusting, according to rate adjustment indication information, a transmission rate of the ODUflex frame of each network node on the ODUflex channel, to enable the transmission rate of each network node on the ODUflex channel to be unified. | 02-25-2016 |
20160088376 | NETWORK CONTROLLER, A MULTI-FABRIC SHELF AND, A METHOD OF PROCESSING TRAFFIC IN A TRANSPORT NETWORK - A network element of a transport network has three fabrics housed within a single shelf of a telco rack, namely a packet fabric, an electrical fabric and an optical fabric. A stream of traffic including a plurality of lambdas is received at a trunk interface of such a shelf. The optical fabric in the shelf performs optical switching on the stream to replace a first lambda in the stream with a second lambda. The first lambda is converted within the shelf into an electrical signal. Also within the shelf, first frames are recovered from the electrical signal. The packet fabric in the shelf is used to perform packet switching on the first frames to generate a flow of second frames. The flow of second frames is transmitted at a client interface of the shelf. | 03-24-2016 |
20160094900 | OPTICAL TRANSMISSION DEVICE AND OPU FRAME GENERATION METHOD - An optical transmission device includes: a serializer and deserializer configured to convert an input client signal into parallel data at a sampling rate of k times (k is a power of 2) a rate of the input client signal and output the parallel data; a frame generation section configured to generate an optical channel payload unit (OPU) frame from the client signal; and a stuff control section connected to an output of the parallel data and configured to perform, in units of 1/k bits, a stuff operation to map the client signal into the OPU frame and thereby calculate a Cn(n=1/k) value which is a theoretical value of the stuff operation. | 03-31-2016 |
20160119221 | TRANSMISSION DEVICE AND METHOD FOR ESTABLISHING PATH IN MULTILAYER NETWORK - A transmission device is located between a first node and a second node in a multi-layer network in which a path message is transmitted from the first node to the second node and a response message corresponding to the path message is transmitted from the second node to the first node. A transmission device includes: an upper layer switch that processes traffic in the upper layer; a lower layer switch that processes traffic in a lower layer; and a signaling processor that processes the path message and the response message. The signaling processor transmits a message for establishing a path in the lower layer to a node represented by node information added to the response message received from an adjacent node on a downstream side when the lower layer switch is not connected to a lower layer switch of an adjacent node on an upstream side. | 04-28-2016 |
20160142798 | TRANSMISSION APPARATUS - A transmission apparatus includes: a reception processing unit configured to perform a reception processing on a first signal into which second signals having different rates and including overhead information are hierarchically multiplexed; and a common overhead processing unit configured to process the overhead information included in the first and second signals according to a common rate to hierarchical layers. | 05-19-2016 |
20160142799 | TRANSMISSION DEVICE - A transmission device to multiplex in a first signal a plurality of second signals each having a low rate as compared with the first signal, the transmission device includes: a plurality of memories to store the plurality of second signals; a selector to select one of the second signals read from the plurality of memories; and a controller to control read timing to read the plurality of second signals from the plurality of memories and signal selection timing to select the one of the second signals by the selector so as to execute rearrangement processing of the plurality of second signals read from the plurality of memories in accordance with cross-connect setting information for the plurality of second signals and shift processing of the plurality of second signals read from the plurality of memories in accordance with multiplexing positions of the plurality of second signals for the first signal. | 05-19-2016 |
20160156546 | METHOD AND APPARATUS FOR LOCAL PATH PROTECTION | 06-02-2016 |
20160191196 | DC-COUPLED LASER DRIVER WITH AC-COUPLED TERMINATION ELEMENT - An optical signal module including a driver and an optical signal module. The driver includes a differential pair configured to receive and process an input signal to create a drive signal. A modulation current source provides a modulation current to the differential pair. One or more termination resistors connected to the differential pair for impedance matching. A first switch, responsive to a first control signal, maintains charge on a charge storage device. The optical signal module includes an optical signal generator arranged between a supply voltage node and a bias current node. The optical signal generator receives the drive signal and generates an optical signal representing the input signal. A second switch is between a supply voltage node the bias current node. The second switch, responsive to second control signal, selectively establishes a short between the supply voltage node the bias current node. | 06-30-2016 |
20160380818 | TDM NETWORK CALL WITH COMPOUND SERVICE LAYER AGREEMENT - A method, implemented in a network with a control plane, is described for creating a compound Service Level Agreement (SLA) call for a Time Division Multiplexing (TDM) service in the network. The method includes creating the call with a non-preemptible component and a preemptible component, the compound SLA comprising the non-preemptible component and the preemptible component; implementing endpoints for the call at a source node and a destination node; and responsive to a preemption event in the network, removing the preemptible component at the endpoints. A node and network are also described. | 12-29-2016 |
398053000 | Including delay | 7 |
20090060506 | OPTICAL PACKET SWITCHING APPARATUS AND METHOD THEREFOR - An optical switch section that switches the path of an optical packet transmitted thereto and outputs the optical packet, and a control section that generates multiple switch control signals in accordance with the destination of an optical packet transmitted thereto, transmits the multiple control signals to the optical switch section through multiple signal transmission lines and controls the ON/OFF states of multiple optical switches are included, and delay measuring means for measuring a difference in delay time among the multiple signal transmission lines is provided. In this case, the control section adjusts the transmission times of the multiple switch control signals such that the difference in delay time measured by the delay measuring means can be cancelled and that the multiple switch control signals transmitted through the multiple signal transmission lines can arrive at the multiple optical switches simultaneously and transmits the multiple switch control signals. | 03-05-2009 |
20090252493 | NETWORK NODE, BUFFER DEVICE, AND SCHEDULING METHOD - A buffer device includes at least one internal switching unit and at least one basic buffer unit. The internal switching unit includes at least two inputs and at least two outputs. The internal switching unit and the basic buffer unit form a closed connection by alternating with each other via one input of the two inputs and one output of the two outputs. Another one of the at least two inputs of the internal switching unit receives a light wave. The internal switching unit outputs the light wave according to a first control signal. The basic buffer unit buffers the light wave from the internal switching unit. At the same time, a network node and a scheduling method are also provided. A network node with the buffer device has a small scale and is easy to realize, while the data packet loss rate is decreased and the head of line blocking is avoided. | 10-08-2009 |
20110052192 | SYSTEMS AND METHODS FOR STORING OPTICAL DATA - An optical data storage system and method of use thereof are presented. The optical data storage system includes one or more optical buffer modules connected in series. Each optical buffer module includes a cross connect. Each cross connect is connected, by a pair of inputs and outputs, to an optical data storage unit, for example, a fiber delay line, by a pair to either an optical packet network or a cross connect of a first adjacent buffer module in the series, and by a pair to a cross connect of a second adjacent buffer module in the series. The buffer module also includes a read signal output line which is connected to a read signal input line of the second adjacent buffer module for transmitting a read signal. A control module within each buffer module directs the passage of data through the cross connect. | 03-03-2011 |
20110217040 | OPTICAL TRANSMISSION SYSTEM - An optical transmission system includes a polarization multiplexing optical transmitter for transmitting an optical signal, where an X-polarized signal and a Y-polarized signal each having a having predetermined frame structure are polarization-multiplexed, to an optical fiber transmission path, and a polarization multiplexing receiver for receiving the optical signal that has propagated through the optical transmission path. The polarization multiplexing optical transmitter delays a frame assignment signal (FAS) in the Y-polarized signal, by a predetermined delay time τ, relative to FAS in the X-polarized signal. The polarization multiplexing optical receiver includes a polarization splitter for splitting the received optical signal into two branches of polarized signals which are orthogonal to each other, a time difference detector for detecting a time difference of FASs between the two polarized signals, and a polarization identifying unit for identifying which of the two polarized signals is the X-polarized signal or Y-polarized signal. | 09-08-2011 |
20120315039 | OPTICAL COMMUNICATION DEVICE AND SIGNAL ADJUSTING METHOD - An optical packet switching device causes branching of an optical packet that is input to an optical switch and detects a synchronization pattern having a predetermined number of bits from the branched optical packet. Then, the optical packet switching device calculates a synchronization point indicating a location of the synchronization pattern with respect to a detection timing and controls, in accordance with the calculated synchronization point, a delay amount of a delay element that delays an optical packet ON signal that is output to the optical switch. | 12-13-2012 |
20130089327 | Polarization Switching for Optical Fiber Communications - A method implemented in a transmission apparatus used in an optical fiber communications system for a polarization switched differential quaternary phase-shift keying (DQPSK) signal is disclosed. The method comprises splitting data into two or more data streams, inputting said two or more data streams to 1-bit DQPSK precoders to perform 1-bit DQPSK precoding, and multiplexing inphase outputs of the 1-bit DQPSK precoders to generate a first output; and multiplexing quadrature outputs of the 1-bit DQPSK precoders to generate a second output. Other methods, apparatuses, and systems also are disclosed. | 04-11-2013 |
20150358700 | APPARATUS AND METHOD FOR ENABLING A PASSIVE OPTICAL NETWORK ON SUPPORTING TIME SYNCHRONIZATION - An apparatus for enabling a passive optical network (PON) having an OLT and at least one ONU on supporting time synchronization is disclosed. The apparatus comprises a timestamp correction module configured to make at least one network delay between the OLT and the at least one ONU of the PON equivalent to an equivalent path delay, wherein the timestamp correction module, through the PON, makes the at least one ONU responsible for modifying the timestamp in at least one PTP packet from the OLT, so that a slave clock at the backend of the at least one ONU is equivalent to synchronizing with a virtual master clock. The disclosure computes and corrects PTP commands so that the PTP clock at an ONU's backend may synchronize precisely with the master clock at an OLT's front end. | 12-10-2015 |
398054000 | Including photonic packet switching | 7 |
20100040368 | METHOD AND SYSTEM FOR MANAGING OFF-NET VIRTUAL CONNECTIONS - An approach is provided for managing off-network virtual connections. A first management channel is mapped to a second management channel for transport of management information over an optical time-division-multiplexing (TDM) network that includes an off-network portion. The off-network portion corresponds to a third party provider. The first management channel corresponds to an electrical connection and the second management channel corresponds to an optical connection. | 02-18-2010 |
20100272437 | TDMA PASSIVE OPTICAL NETWORK OLT SYSTEM FOR BROADCAST SERVICE - Provided is a TDMA (time division multiple access) PON (passive optical network) OLT (optical line terminal) system for a broadcast service, including packet processor determining information according to types of frames (unicast, multicast, and broadcast frames) and a switch output port using header information (an IP address of a packet header, MAC (medium access control) addresses of Ethernet frames, and the like) of data received from an external node or the ONT (optical network terminal) and attaching the information to header parts of the frames to generate second data, a switch copying the second data by a predetermined number of times according to a transmission method and transmitting the second data to a corresponding destination output port according to the identification codes, M TDMA PON MAC processors removing the identification codes added to the second data and converting the second data into TDMA PON frames, and M optical transceivers converting the TDMA PON frames into optical signals and transmitting the optical signals to an ONT. | 10-28-2010 |
20110081149 | PHOTONIC NETWORK PACKET ROUTING METHOD AND PACKET ROUTER FOR PHOTONIC NETWORK - A photonic network packet routing method includes the steps of optically encoding destination address information attached to an IP packet using light attributes, discriminating the encoded address information of the IP packet by optical correlation processing, switching to an output path for the IP packet based on a result of the discrimination, and outputting the IP packet labeled with prescribed address information on the output path selected by the switching step. A packet router for a photonic network includes a device for encoding by use of light attributes destination address information attached to an IP packet, a branching device for sending the IP packet having the encoded destination address information onto two paths, an address processing device for subjecting one IP packet received from the branching device to optical correlation processing and outputting a switch control signal based on a result of the discrimination, and a switch device for selectively outputting the packet by switching an output path of the other packet received from the branching device based on the address control signal from the address control device. | 04-07-2011 |
20120033971 | Multi-Network Compatible Data Architecture - A backbone network, comprising a network switch configured to communicate data over Ethernet and SONET/SDH interfaces without encapsulating the data. Also disclosed is a backbone network, comprising a plurality of synchronized network switches, wherein the switches are configured to communicate a plurality of time division multiplexed data streams across at least part of the network via a plurality of Ethernet interfaces and a plurality of SONET/SDH interfaces, and wherein the switches are configured to communicate the data streams without encapsulating the data streams. | 02-09-2012 |
20120201540 | OPTICAL PACKET SWITCHING SYSTEM AND OPTICAL PACKET SWITCHING DEVICE - An optical packet switching device is provided with: a first input unit and a second input unit for receiving an optical packet signal having destination information and priority information; a first demultiplexer and a second demultiplexer for branching the optical packet signal; an optical switch unit for routing one of branched optical packet signals; a first analyzer unit and a second analyzer unit for analyzing the header of the other branched optical packet signal so as to detect the destination information and the priority information; and an output competition determination unit for checking for temporal competition of a plurality of optical packet signals based on destination information and for determining whether the optical packet signals should be transmitted or discarded based on priority information when there is competition. | 08-09-2012 |
20140205292 | OPTICAL PACKET SWITCHING SYSTEM - An optical packet switching system includes optical packet switching apparatus and an optical packet transmitting apparatus. The optical packet switching apparatus includes client optical delay units for delaying optical packet signals, network optical delay units for delaying one of the network optical packet signals, the network optical delay unit having a longer delay time than the client optical delay unit, an optical switch unit for switching the route of the inputted client optical packet signal so as to be sent out, an optical switch control unit for controlling the optical switch unit. The optical switch control unit is configured in such a manner as to detect a free time slot. The optical packet transmitting apparatus adjusts transmit timing, with which the client optical packet signal is sent out, in such a manner that the client optical packet signal is inserted into the free time slot. | 07-24-2014 |
20140334821 | System and Method for Photonic Switching - In one embodiment, a method of photonic frame scheduling includes receiving, by a photonic switching fabric from a top of rack (TOR) switch, a frame request requesting a time slot for switching an optical frame to an output port of a photonic switch of the photonic switching fabric and determining whether the output port of the photonic switch is available during the time slot, and generating a contention signal including a grant or a rejection, in accordance with the determining. Also, the method includes assigning the time slot to the TOR switch for the output port of the photonic switch, when the contention signal includes the grant, transmitting, by the photonic switching fabric to the TOR switch, the contention signal and receiving, by the photonic switching fabric from the TOR switch, the optical frame during the time slot, when the contention signal includes the grant. | 11-13-2014 |