| 摘要 |
A fault recovery system of a ring network based on a synchronous transport module transmission system, having a fault data writing unit (22,32) for writing, when an input fault is detected by a node, fault data (F1(#n,#k,S)) in a predetermined user byte (UB) in an overhead of a frame flowing through both a working line (W) and a protection line (P) running in opposite directions to each other, and, by detecting the fault data in a supervision node or a node just before the fault position, the supervision node or the node just before the fault position excecutes a loopback operation. <IMAGE>
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