Abstract: An information processing device in a communication apparatus performs a management process of traffic flow management information for transfer of data including a plurality of frames from a transmission source terminal to a transmission destination terminal. Where new traffic flow management information of a traffic flow associated with a data frame identified by an identification unit on the basis of identification information included in the received data frame is recorded in the communication apparatus, a recording unit determines whether the number of pieces of traffic flow management information already recorded is equal to or more than a threshold value, and calculates and records a scheduled release time of the traffic flow management information according to a determination result.

Abstract: An information communication device arranged between a transmission-side device and a reception-side device according to one embodiment includes a reception unit that receives transmission data to be transmitted from the transmission-side device to the reception-side device, a control unit that receives a notification indicating deterioration in quality the transmission data, determines conversion object data for converting a data type of the transmission data or reducing an information amount of the transmission data and non-conversion object data for not converting a data type based on the notification, and generates post-conversion object data by converting a type of the conversion object data based on the notification, a transmission queue that synthesizes the non-conversion object data and the post-conversion object data and generates converted transmission data, and a transmission unit that transmits the converted transmission data to the reception-side device.

Abstract: A transfer device (10) transfers a packet between a first network (31) and a second network connected to a network device (32) via a first communication path and a second communication path, the network device (32) functioning as a gateway for connecting to the first network (31). The transfer device (10) includes a control unit (16, 22). The network device (32) holds correspondence information indicating a correspondence relationship between each of a first communication port for connecting to the first communication path and a second communication port for connecting to the second communication path, and address information regarding a destination of the packet. The control unit (16, 22) transmits, to the network device (32), an update control signal for the network device (32) to update the address information associated with the first communication port in the correspondence information.

Abstract: A measurement device according to an aspect of the present invention includes: a generation unit that generates first and second optical pulse trains in which a time interval between optical pulses is constant; a transmission unit that transmits the first optical pulse train to a device to be measured; a reception unit that receives the first optical pulse train returning from the device to be measured; a measurement unit that measures the number of optical pulses transmitted by the transmission unit from when the transmission unit transmits an optical pulse included in the first optical pulse train to when the reception unit receives the optical pulse; an identification unit that identifies a phase amount corresponding to a phase difference between the received first optical pulse train and the second optical pulse train; and a calculation unit that calculates a propagation delay amount between the measurement device and the device to be measured on the basis of the measured number of optical pulses and the

Abstract: A relay device includes a device internal clock to indicate time; a memory to store information; a communication unit to transmit and receive a signal including a synchronization signal and a normal signal to and from a master and a slave. Further, there is a retention time processing unit to store synchronization signal information indicating the synchronization signal received by the communication unit in the memory and extract the synchronization signal information from the memory when a retention setting time longer than a first predetermined time elapses from the reception of the synchronization signal by using the time indicated by the device internal clock; and a transmission signal control unit to control the communication unit to stop transmitting the normal signal when the first predetermined time elapses from the reception of the synchronization signal and transmit the synchronization signal indicating the synchronization signal information.

Abstract: An object is to provide a communication system, a communication method, a transmission-side switching device, a reception-side switching device, and a program that can carry out network switching of a plurality of L2NWs with a short communication disconnection time without limiting topology. A transmission-side accommodation SW duplicates a frame received from a transmission-side user device and transfers the frame to a plurality of L2NWs to which the transmission-side accommodation SW is connected. When receiving a frame from any one of the plurality of L2NWs to which a reception-side accommodation SW is connected, the reception-side accommodation SW transfers, to a reception-side user device, only a frame from one L2NW allowed to transfer a frame to an access accommodation port and discards frames from the other L2NWs. At a switching time of the L2NWs, the reception-side accommodation SW changes the L2NW allowed to transmit a frame to the access accommodation port.

Abstract: An object of the present disclosure is to reduce band compression even in a case where a frame addressed to an original (overwritten) MAC is received again after a MAC address is overwritten. A communication device according to the present disclosure measures a traffic amount in any predetermined determination data unit, holds MAC entry information including the measured traffic amount and a MAC address in a MAC learning data holding unit, at the time when the number of pieces of MAC entry information held by the MAC learning data holding unit reaches an upper limit, searches for minimum MAC entry information with a minimum traffic amount from among traffic data amounts in determination data unit held by the MAC learning data holding unit, and overwrites the minimum MAC entry information obtained by search with unlearned MAC entry information that is not held by the MAC learning data holding unit.

Abstract: It is an object of the present disclosure to efficiently collect traffic data on all paths in a network from a transfer device and thus to reduce a collection load. The present disclosure provides an apparatus that refers to a route database storing route information on paths formed in a network and solves an optimization problem based on the route database so that traffic data on all the paths formed in the network are obtainable and a number of collection target transfer devices from which the traffic data are to be collected is reduced, thus determining, from among a plurality of the transfer devices constituting the network, the collection target transfer devices from which the traffic data are to be collected.

Abstract: The disclosure has an object to allow local expansion without causing any loop. The disclosure is a system to which two nodes respectively belonging to different ring networks are connected, wherein the two nodes are connected to each other using a predetermined customized port, upon receipt of a predetermined unicast frame, one of the two nodes transmits the frame to another of the two nodes using the customized port, upon receipt of the predetermined unicast frame from the customized port, the other of the two nodes forwards the unicast frame, and upon receipt of a frame different from the predetermined unicast frame from the customized port, the other of the two nodes discards the frame.

Abstract: An object of the present disclosure is to provide a communication system, a communication path switching method, a communication device, and a program capable of continuing communication or shortening a communication disconnection time even during an operation of switching paths. A communication system according to the present disclosure is a communication system including two communication devices forming a duplex path with a common access network.

Abstract: According to an embodiment, a transmission apparatus includes: a synchronization frame generation unit configured to generate a synchronization frame to be associated with a user frame; a synchronization frame identifier application unit configured to apply a synchronization frame identifier that enables recognition of a transmission order property of the synchronization frame to each synchronization frame generated by the synchronization frame generation unit and embed the synchronization frame identifier in the synchronization frame; a synchronization frame insertion unit configured to insert the synchronization frame with the synchronization frame identifier embedded therein by the synchronization frame identifier application unit into a point immediately after another user frame associated with another synchronization frame one before the user frame associated with the synchronization frame and immediately before the user frame associated with the synchronization frame; and a frame copying unit configured

Abstract: An object is to provide a route switching method, a transfer device, and communication system that can continue communication even during route switching work. In a route switching method according to the present invention, in bypass transfer that transfers a packet while bypassing a non-transferable route, the transfer device having detected the non-transferable route attaches a bypass packet flag to the packet that passes through a non-transferable route and specifies the packet as a bypass packet, the transfer device having detected the non-transferable route returns the bypass packet and transfers the bypass packet in a direction opposite to that of the packet in the ring network, and the transfer device for which the blocked port is set in the ring network transfers the bypass packet through the blocked port before the route switching work.

Abstract: An object of the present invention is to provide a management device and a management method with which it is possible, in a multilayer integrated NW, to reflect a tendency to failure in a transmission layer in maintenance of an NW constituting an upper layer. A management device according to the present invention, by using an index for evaluating the signal quality of the transmission layer as a trigger for performing a preventive maintenance switch in the NW of the upper layer and determining, in an integrated fashion, the effect of performing route switches on the respective layers on a functional requirement such as delay, realizes preventive maintenance on an accommodated line through correlation between communication layers in a manner that more closely satisfies the functional requirements of the NW.

Abstract: According to one embodiment, there is provided a communications system that conducts multiplex communications of main signals and at least one sub-signal via redundant routes between a transmission apparatus and a reception apparatus. The transmission apparatus includes a main signal duplication unit configured to duplicate each of the main signals to be communicated via a main signal channel, according to the number of the redundant routes, and a delay unit configured to adjust sending timings of copies of the main signal on the respective redundant routes based on the at least one sub-signal to be communicated via a sub-signal channel and transmit the copies of the main signal to the respective redundant routes.

Abstract: According to one aspect of the disclosure, in a communication apparatus at a transmission end, a packet train that is input is grouped to generate a duplicate packet for each packet group. For each packet group, encoded packets are generated using some packets in a group of duplication source packets and other packets in a group of duplicate packets that do not correspond to the some packets in the group of duplication source packets, and above-described other packets in the duplication source, some packets in the group of duplicate packets that are not used to generate the encoded packets, and the above-described encoded packets are transmitted.

Abstract: A communication apparatus according to an aspect of the present invention is a communication apparatus that is able to be connected to a different communication apparatus via a network including three or more paths, the communication apparatus including a processing circuitry configured to measure a network state for each of the three or more paths, calculate an evaluation value based on a result of measuring the network state for each of the three or more paths, select at least two paths to be used for communication from among the three or more paths based on the calculated evaluation value, generate a packet for transmission through duplication of an input packet, and transmit the generated packet to the different communication apparatus through the selected paths.

Abstract: An object of the present invention is to provide a communication system and a communication method that can suppress an increase in the total fiber distance even if the number of secondary devices increases and that can make complex processing for band allocation for uplink optical signals unnecessary. The configuration of the communication system according to the present invention is a mixture of a ring type and a branch type, in which an optical fiber cable (primary path) from a communication station to each user's home is arranged in a ring (loop) shape, and the primary path is branched and laid to the user's home. Furthermore, unidirectional communication is enabled by a ring-type primary path, and the transmittable amount can be made uniform by further combining time division multiplexing.

Abstract: With a network design apparatus, a network design method, and a network design processing program, a network configuration is designed for a network in which a transfer apparatus is disposed at each of a plurality of communication hubs and the communication hubs are connected via a link by a link portion apparatus in the transfer apparatus. In design of a network configuration, a threshold value of an inter-end delay and the number of redundant paths are calculated for each line on the basis of topology information, line information, and design parameter information. A path candidate set is calculated for each line on the basis of the threshold value of the inter-end delay and the number of redundant paths.

Abstract: A network design apparatus, a network design method, and a network design processing program design a network configuration for a network in which a transfer apparatus is disposed at each of a plurality of communication hubs, and the communication hubs are connected via a link by a link portion apparatus in the transfer apparatus. In design of the network configuration, the optimal path candidates of each of the lines minimizing a total cost value in the overall network is calculated. In the calculation of the optimal path candidates of each of the lines, only a path candidate of each of the lines can be selected, and a combination candidate of link portion apparatuses for each of the links is derived uniquely from the selected path candidate of each of the lines.

Abstract: With a network design apparatus, a network design method, and a network design processing program, a network configuration is designed for a network in which a transfer apparatus is disposed at each of a plurality of communication hubs and the communication hubs are connected via a link by a link portion apparatus in the transfer apparatus. In design of a network configuration, an optimal combination candidate of a link portion apparatus for each link for minimizing a total cost value in an overall network is calculated on the basis of a combination candidate set of link portion apparatuses. The combination candidate set of the link portion apparatuses is configured using only combination candidates with a cost-effectiveness indicating a ratio of a total capacity to a total cost value of the link portion apparatus higher than a predetermined reference.