Nippon Telegraph and Telephone Corporation

Yukio Toyoshima

Keita Nishimoto

Junichi Kani

Takashi Yamada

Kota Asaka

One aspect of the present invention is a optical main signal processing node apparatus including: an input port for inputting an optical multiplexed with signals pertaining to a plurality of services from an optical transmission path; an output port for outputting an optical signal multiplexed with signals pertaining to a plurality of services to an optical transmission path; a optical main signal processer configured to perform optical main signal processing on an optical signal input from the input port; and a path switch configured to switch a path of the optical signal input from the input port to one of a first path for guiding the optical signal to the output port and a second path for guiding the optical signal to the optical main signal processer.

Optical main signal processing node apparatus and control method of optical main signal processing node apparatus

A communication system includes a branching device, a plurality of acceptance judgement apparatuses connected to the branching device, and processing devices each connected respective one of the plurality of acceptance judgement apparatuses and performing processing according to a received signal. The acceptance judgement apparatus includes a reception unit, a determination unit, and a transfer unit. The reception unit receives one of a plurality of signals which have been broadcast by the branching device. The determination unit determines whether or not to transfer a first signal that is a signal which has been received by the reception unit to one of the processing devices connected to the own apparatus on the basis of the first signal and one or more second signals that are one or more signals which have been received by the reception unit before the first signal. The transfer unit transfers the first signal to one of the processing devices connected to the own apparatus when the determination unit determines to transfer the first signal, and discards the first signal when the determination unit determines not to transfer the first signal.

Acceptance judgment apparatus and acceptance judgment method

An optical buffer unit includes a plurality of delay line units each of which gives a delay to optical signals, and a switch that receives an optical signal output from one of the delay line units, includes a first output for outputting the optical signal to a next one of the delay line units and a second output for outputting the optical signal to another apparatus, and outputs the optical signal from the first output or the second output.

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Musashino, Japan

Yukio Toyoshima