| 摘要 |
An OLT transmits an inquiry frame for checking a link and checking a data accumulation amount from an ONU. The ONU returns an inquiry response frame. When the ONU detects no uplink-traffic, the ONU writes to that effect on the response frame and transmits the response frame to the OLT. The OLT monitors a downstream traffic. When the OLT recognizes, based on a result of the monitoring or the inquiry response frame, no uplink or downstream traffic, the OLT instructs the ONU to transition to a low power consumption mode. When the ONU receives the instruction, the ONU transitions a function unit corresponding to instruction content to the low power consumption mode. When the ONU does not receive the inquiry frame for a predetermined time, the ONU transitions function units other than a function unit that performs communication control to the low power consumption mode. The OLT stops the transmission of the inquiry frame while the subscriber side apparatus transitions to the low power consumption mode.
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