Patent ID: 9621272
Date: 2017-04-11
CPC Classifications: H04B,H04J

Claim:
1. An optical transmission device comprising: an optical switch unit which outputs an input optical signal to a given path; a plurality of optical transceiving units, each of which receives an optical signal from the optical switch unit and transmits an optical signal to the optical switch unit; and a control unit which controls the optical switch unit and the optical transceiving units; wherein each optical transceiving unit comprises a unit which operates in a plurality of different operation states, the plurality of different operation states being a normal mode in which the optical transceiving unit transmits and receives optical signals, a first standby mode wherein the optical transceiving unit does not transmit nor receive optical signals, and a second standby mode in which power consumption is smaller than power consumption in the first standby mode; and the control unit comprises a unit which causes the optical transceiving unit in the first standby mode to transition to the normal mode and causes the optical transceiving unit in the second standby mode to transition to the first standby mode or the normal mode; and the optical transceiving units in the normal mode are configured to be assigned a priority based on a predetermined criterion; and the control unit comprises a unit that controls the optical transceiving units so that when a monitor unit detects an abnormality in a low-priority optical transceiving unit in the normal mode, as many optical transceiving units in the second standby mode as the number of optical transceiving units in which the abnormality is detected in the normal mode transition to the normal mode.