Hitachi, Ltd.

Takuya Iwasawa

Kenta Noda

Takayuki Suzuki

An embodiment of the invention is an optical communication system including: a plurality of interface boards which transmit and receive optical signals to and from interface boards facing the plurality of interface boards; and a monitoring control device which monitors states of the plurality of interface boards. A first interface board of the plurality of interface boards includes: a replacement unit capable of monitoring the states of the plurality of interface boards on behalf of the monitoring control device and independently receiving supply of power; and a control unit configured to start the replacement unit in a case where a fault occurs in the monitoring control device and stop or halt the replacement unit in a case where there is no fault in the monitoring control device.

Optical communication system, interface board and control method performed in interface board

Provided is an optical relay system () which is capable of suppressing wasteful power consumption of an entire system to a low level. The optical relay system () includes a plurality of relay devices () and a network control device (). The network control device () causes an optical signal to be regenerated by a regenerative repeater () within the relay device () existing at an upstream of the relay device () reporting that the optical signal has deteriorated by a degree exceeding a predetermined level. Further, the network control device () causes the regenerative repeater () to stop regenerating the signal in a case where deterioration of the signal remains within an allowable range even when the regenerative repeater () stops regenerating the signal.

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Kawasaki, Japan

Takuya Iwasawa