| 摘要 |
PROBLEM TO BE SOLVED: To conduct fault recovery having compatibility with a current BLSR loopback operation that can exclude a delay in a BLSR node recovery path in a two-way multiplex section switch ring transmission system. SOLUTION: A connection path is set up again by using a loopback connection at a node placed at a boundary of a fault and then setting a jumper connection path each active branch receiving effect of the fault. Formation of a undesired loop in the connection path is prevented by setting the jumper connection path to the node at the boundary of the fault. A memory of each node stores a prepared connection path, a jumper path and a jumper path index denoting whether or not the jumper connection path is in existence. When the fault is released, the jumper path is removed, its recording is deleted from the memory, the prepared connection is recovered and the jumper index is reset.
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