PON SYSTEM, SUBSCRIBER-SIDE TERMINAL APPARATUS, STATION-SIDE TERMINAL APPARATUS, AND POWER SAVING METHOD

摘要

In the PON system, the ONU 10 includes the receive buffer 13 that stores therein a signal in a downstream direction transmitted from the OLT 1 and the PON control unit 11 that controls transition to a power-saving state and transition to a normal state for the reception buffer 13, the OLT 1 includes the transmission buffer 4 that stores transmission data to be transmitted to the ONU 10 and the PON control unit that transmits the downstream power-saving-state transition request that requests the ONU 10 to transition to the downstream power-saving state when it is determined that transmission data addressed to the ONU 10 is not present in the transmission buffer 4, and the PON control unit 11 sets the reception buffer 13 to a power-saving state for a predetermined downstream sleep time requested based on the downstream power-saving-state transition request.