Patent application number | Description | Published |
20090161573 | Network System, Edge Node, and Access Device - In order to specify a data discarding point in a network, provided is a network system for collecting, in the network including an access network and a transport network, pieces of statistical information including a traffic amount of the network, including: an access terminal coupled to the access network; and an edge node for interconnecting the access network and the transport network, in which: the access terminal is configured to: measure pieces of statistical information including a traffic amount in the access terminal; and notify the edge node of the measured pieces of statistical information; and the edge node collects the pieces of statistical information notified by the access terminal. | 06-25-2009 |
20090232148 | COMMUNICATION SYSTEM - A packet communication system of this invention includes a user access device at a user point for providing a user with connectivity to a plurality of carriers, carrier communication networks linked to the user access device, and a carrier management network which controls and manages the user access device and communication devices. A communication device receives a control frame-inserting command from the carrier management network, and sends a control frame containing therein control frame transfer information that indicates which one of termination and send-back processing is performed at a destination device. In response to receipt of the control frame, a user access device that is the destination of this frame extracts therefrom the control frame transfer information. If this information indicates the termination then perform termination; if send-back, add thereto a header necessary for the send-back and then transfer it. | 09-17-2009 |
20090232265 | Clock data recovery circuit - A clock data recovery circuit that supplies stable reproduction clocks to the object respectively by shortening the time of bit synchronization with each received burst data signal regardless of jittering components included in the received burst data signal, includes an interpolator that generates a reference clock having the same frequency as that of a received burst data signal and two types of determination clocks having a phase that is different from that of the reference clock respectively; and a phase adjustment control circuit that can change the phase of the reference clock in units of M/2π. After beginning receiving of a burst data signal, the clock data recovery circuit sets a large phase change value at the first phase adjustment timing and reduces the change value in the second and subsequent phase adjustment timings, thereby realizing quick bit synchronization with the received burst data signal to generate a reproduction clock. | 09-17-2009 |
20090245792 | NETWORK SYSTEMS AND COMMUNICATIONS EQUIPMENT - A duplicate system includes an active side (0 side) and a standby side (1 side). An OLT includes an autodiscovery function which, when the OLT is active, determines the next starting time of autodiscovery procedure of the standby side and notifies the standby side of the above starting time, a table of management information that holds the line information of a partner with which the OLT forms the duplicate system and the next starting time of autodiscovery procedure of the OLT, and a function of switching active side that calculates a timing of switching active side. A function of receiving data from ONT in the OLT includes a function of detecting data sequence number and a function of detecting queue length. Moreover, a function of sending data of ONT includes a function of assigning sequence number and a function of discarding data. | 10-01-2009 |
20090303996 | COMMUNICATION DEVICE WITH A PATH PROTECTION FUNCTION, AND NETWORK SYSTEM USING THE COMMUNICATION DEVICE - Provided is a network system including a start device and multiple end devices. A point-to-point (P-to-P) logical path is set to be used for unicast communication between the start device and each of the end devices. A first point-to-multipoint (P-to-M) logical path and a second P-to-M logical path are set to be used for multicast communication from the start device to the multiple end devices. The start device transmits data over the first P-to-M logical path. When one of the end devices detects a defect along the first P-to-M logical path, the end device that has detected the defect transmits a switch request over the P-to-P logical path set between this end device and the start device. The start device receives the switch request and transmits data over the second P-to-M logical path. | 12-10-2009 |
20100189114 | NETWORK COMMUNICATION NODE - The invention addresses reducing time taken to obtain destination MAC addresses or alleviating the workload of manually setting MAC addresses in physical ports for duplicate PtP connections in WAN. A physical port is provided with functionality that, when transmitting a data frame received by the transmission block in the physical port, copies the content of the source MAC address field in the received data frame to the destination MAC address field, selects a destination MAC address randomly, or specifies a fixed value which has been set beforehand as the destination MAC address. The port is also provided with functionality that performs receive processing on a data frame after being received by the reception block without inspecting the destination MAC address field in the MAC header. Thereby, the time to obtain addresses is reduced or the setting workload is lessened. | 07-29-2010 |
20100220743 | BUFFER MANAGEMENT METHOD AND PACKET COMMUNICATION APPARATUS - A packet communication apparatus includes a frame buffer of a linked list method and holds chain information and buffer size information, for structuring a linked list buffer for each user flow, in two areas consisting of an operation area and an update area. While usually in service, the buffer is structured by using the chain information in the operation area and the buffer size information in the same area such that the frame is read/written in the frame buffer. When the chain information in the update area and the buffer size information in the same area have been changed, a queue size is changed by reflecting the updated chain information and the updater buffer size information into the operation area, when both the read pointer and the write pointer respectively have gone around the buffer, or when there is no frame stored in the buffer. | 09-02-2010 |
20100226244 | Network System - Provided is a multicast path management method for a connectionless communication. Also provided is a path protection function which is effective when a path has failed. A network is formed by a trunk and a branch path. The multicast path is managed by end-to-end and when a failure has occurred, an instruction is issued from the apex of the multicast tree to respective end-to-end paths so as to switch from the currently used channel to a backup path. Thus, upon failure, an individual path protection can be performed without affecting other parts of the tree to which the same multicast flow as the defective path is distributed or the distribution state of the multicast flow. | 09-09-2010 |
20120057605 | Bandwidth Control Method and Bandwidth Control Device - A communication device connected to a network includes an input interface that receives a frame; an output frame buffer that holds the frame received by the input interface; multiple bandwidth controllers that controls a read request notice timing of the frame received by the input interface for each flow; an output scheduler that determines a read timing of the frame on the basis of the frame read request of each flow notified by the bandwidth controllers; and an output interface that outputs the frame in the timing notified by the output scheduler, and each of the bandwidth controllers determines on the basis of a token value held by each flow, whether or not the read request of the flow is notified to the output scheduler, and determines the amount of adding or subtracting the token value on the basis of the accumulated number of frames in the output frame buffer. | 03-08-2012 |
20120127877 | PACKET TRANSFER DEVICE AND PACKET TRANSFER METHOD - Packet transfer device and method have both a processing procedure for uninterruptible-switching desiring packets and a processing procedure for low-delay desiring packets, and process each user packet according to a desired one of the processing procedures. The uninterruptible-switching desiring packets are set to be in phase by a delay unit and written into an uninterruptible-switching memory. The low-delay desiring packets are written into a low-delay memory without passing trough the delay unit, that is, without being delayed. A read-out controller reads out a packet from the uninterruptible-switching memory. When the read-out packet is an uninterruptible-switching desiring packet, the packet is directly output, and when the read-out packet is a low-delay desiring packet, the packet is discarded, and a low-delay desiring packet is read out from the low-delay memory and output. | 05-24-2012 |
20120163384 | Packet Transport Node - A packet transport node that composes a transport network, the transport network transports networks that is composed with a communication protocol, the network transports networks is established logical paths used a routing protocol. The packet transport node forwards a user data packet and a routing protocol packet to an appropriate destination. The packet transport node learns correspondence between a logical path of a transport network and a MAC address based on a MAC header of a received packet and learns correspondence between a logical path of a transport network and a logical path used in other network by snooping a routing protocol packet. | 06-28-2012 |
20120294307 | Apparatus and Method for Identifier Management - An identifier management apparatus capable of setting identifier conversion information of a new user without affecting identifier conversion processings of other users, and an identifier management method. The identifier management apparatus converts an identifier given to communication data. Its memory stores multiple hash functions, output values of the hash functions corresponding to the respective plurality of hash functions, multiple entry tables that manage the identifier conversion information indicating a correspondence between the input identifier being an input value of the hash function and an output identifier obtained by converting the input identifier, and a management table for managing a setting status of the identifier conversion information in each entry table. When registering the new identifier conversion information in any entry table, its processor selects an entry table that should register new identifier conversion information depending on setting statuses of the identifier conversion information in the entry tables. | 11-22-2012 |
20130022052 | Data Transport System and Control Method of Data Transport System - An example of a data transport system includes transport nodes of a transport network, communication devices which communicate via the transport network, and a transport network logical path management server for setting logical paths between the transport nodes within the transport network, and a logical path control server. In a case where a first communication device is newly connected with a first transport node, the first communication device transmits control data to a logical path control server via the first transport node. The logical path control server obtains information about a connection relation between the newly connected first communication device and the first transport node from the control data, and establishes a logical path between the first communication device and a second communication device based on the obtained information about the connection relation and on information about logical paths between transport nodes in a logical path database. | 01-24-2013 |