COMMUNICATIONS METHOD FOR OPTICAL COMMUNICATIONS SYSTEM, OPTICAL COMMUNICATIONS SYSTEM, SECONDARY STATION DEVICE, CONTROL DEVICE AND PROGRAM

摘要

A control device of a communication system according to the present invention relates to a control device of a communication system that connects a plurality of slave station apparatuses to a master station apparatus using a common line. The control device includes a power-saving control unit 11d that intermittently repeats, based on a power saving permission signal transmitted from the master station apparatus, power saving control in which the slave station stops or reduces power supply to a transmitter or a receiver for a predetermined pause duration while maintaining a communication link and a monitoring unit 11c that monitors out of synchronization by comparing a synchronization signal included in a bandwidth allocation signal and a time of the own apparatus. The control device shifts from a registered state to a deregistered state and stops transmission by the transmitter when the monitoring unit 11c detects the out of synchronization. On the other hand, after the pause duration of the power saving control, the control device suppresses the shift to the deregistered state due to the detection of the out of synchronization.