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

摘要

This control device for a communications system relates to a control device for a communications system wherein a plurality of secondary station devices are connected to a primary station device using a common channel. The control device comprises: a power-saving control unit (11d) that repeatedly performs intermittent power-saving control for causing a stop or reduction for a predetermined idle period in the supply of power to a transmitter or receiver while the secondary station device maintains a communications link, on the basis of a power-saving authorization signal transmitted from the primary station device; and a monitoring unit (11c) that monitors for synchronization deviation by comparing a synchronization signal included in the band assignment signal and the time of the device itself. The control device switches from a registered state to a non-registered state and stops the transmission signal by the transmitter when the monitoring unit (11c) has detected a synchronization deviation, and suppresses a shift to the non-registered state caused by detection of a synchronization deviation after a power-saving control idle period.