Description of the problem

An OSN3500 ring multiplexed segment (STM-64) has R_LOS and the multiplexed segment is inverted. At the same time another segment on the ring is also inverted.

Processing

1. Confirm what inversion state the other zone is in, such as SD/SF. this problem is in SF inversion.

2. Confirm what caused the SF inversion. Check the K bytes. This problem can be found in the eastward direction of the multiplexing segment has not been any K bytes reported.

3, through the fiber search or modify the J0 value, to check whether the fiber misconnection. This problem by troubleshooting the fiber connection is correct.

4, check the RMSP configuration of this network element, and found that the multiplexing segment of the full-ring configuration uses the VC4 channel with 16&&32 time slots. At the same time, other network elements are also configured with 16&32 time slots, indicating that there is no problem with the time slot configuration.

5, test whether the network element to open the multiplexing segment sharing, found that the problem network element does not open the multiplexing segment sharing, while other network elements open the multiplexing segment sharing. This is the reason why the problem network element cannot receive K bytes.

Root Cause

Another zone anomaly inversion was due to a direction that kept failing to receive a valid Kbyte.

Solution.

Modify to the correct configuration.

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