Abstract: Provided is a communication system in which a plurality of networks each having a detour within an end-to-end distance are formed, the communication system including: a plurality of section control units that perform path control for each of sections with a network having a detour, the sections being obtained by partitioning the communication system; and an integrated control unit that controls the plurality of section control units, in which the integrated control unit includes an optimization unit that determines an optimal guaranteed delay time for each section to satisfy an end-to-end guaranteed delay time provided by a service, and a notification unit that notifies the plurality of section control units of the optimal guaranteed delay time for each section determined by the optimization unit, and the plurality of section control units each include a switching destination instruction unit that instructs a switching destination to switch to a path satisfying the optimal guaranteed delay time notified from

Abstract: A control device including a collection unit that acquires, at a predetermined cycle, cooperation information, which is information indicating a communication state between a communication system that includes a wireless station including an antenna and an allocation device that allocates a wavelength, and a terminal to be communicated, an analysis unit that analyzes the communication state in the communication system on the basis of the cooperation information, and an allocation control unit that controls execution of wavelength allocation by the allocation device on the basis of an analysis result of the analysis unit.

Abstract: Delay measurement can be performed by a dedicated circuit without use of software. A delay measurement device includes a general-purpose processor, and a delay measurement circuit that operates according to a pre-installed circuit without use of a program. An opposing terminal communicates with the delay measurement device. The delay measurement circuit includes a measurement packet generation unit, a response packet reception unit, and a delay time calculation unit that are pre-installed. The measurement packet generation unit generates a measurement packet, transmits the measurement packet to the opposing terminal, and stores the transmission time of the measurement packet. The response packet reception unit receives a response packet from the opposing terminal. The delay time calculation unit calculates a reciprocation delay time by subtracting the transmission time from the reception time. The opposing terminal transmits the response packet when receiving the measurement packet.

Abstract: A periodic flow detection device include a packet classification unit configured to classify packets into a plurality of flows on the basis of information included in acquired packets; a flow evaluation unit configured to evaluate a possibility that each of the plurality of flows is periodically transmitted on the basis of time at which the packets are acquired; and a flow detection unit configured to detect, from the plurality of flows, a periodic flow that is a flow to which packets periodically acquired belongs on the basis of a result of the evaluation.

Abstract: An optical communication device connected to an optical path in an optical communication network includes a controller. The controller generates an additional information signal having a carrier frequency different from a carrier frequency of a main optical signal. The controller generates an output optical signal by superimposing the additional information signal on the main optical signal, and outputs the output optical signal to the optical path. The additional information signal includes a time stamp reflecting a timing at which the additional information signal is generated.