| 摘要 |
An optical transport system that is connected to client transport devices (11 and 21) each transmitting a client signal, and that includes the client signal in an OTU frame and transports this OTU frame, includes uplink transponders (13 and 14) opposed to construct an uplink transport path, to transport the OTU frame, redundant uplink transponders (17 and 27) opposed to construct a redundant system uplink transport path, to transport the OTU frame, downlink transponders (23 and 24) opposed to construct a downlink transport path, to store maintenance information in the OTU overhead of the OTU frame and transport this OTU frame when a failure occurs in the uplink transport path; optical switches (16, 18, 26, and 28) to connect between the client transport devices (11 and 21), and the uplink transport path and the redundant system uplink transport path in such a way as that switching between the uplink transport path and the redundant system uplink transport path can be performed, to switch from the uplink transport path to the redundant system uplink transport path on the basis of the maintenance information. |
