| 摘要 |
<p>PROBLEM TO BE SOLVED: To make cell information of a faulty line different from that of other lines by inserting a fault point ID into an AIS cell and inserting a pass flag into a leaf line matching the fault point ID when it is sent back as an RDI cell. SOLUTION: When generating AIS toward a route terminal Tr, an AIS generating circuit 71 of an AIS processing circuit 70 at an OAM process part 11 embeds an ID characteristic of the OAM process part 11 and sends the AIS cell to a signal line SW12 , an RDI process circuit 60 when inputting an RDI cell compares a fault point ID embedded in a specific field of the RDI cell with the ID set in its OAM process part 11 , sets a flag in a pass field provided in the RAI cell when they match each other, and outputs the RDI cell to an output line L11 .</p> |
