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Wrong NE attribute configuration conceals alarm

Publication Date:  2012-07-24 Views:  51 Downloads:  0
Issue Description
In OptiX 155/622H, during the testing of the system path protection, no alarms were reported to the NMS, neither ware there any bit errors on the code error tester except RLOS and SYNCLOS and LTI. The expected PS alarm was not reported. This was a point to point network. During the single station debugging, the path protection test passed in both stations. Few error bits were recorded by the Code Tester and we expected to record some when testing the whole system.
Alarm Information
RLOS, SYNCLOS and LTI
Handling Process
By running the ?echnical support quality inspection file? the wrong configuration was able to be detected. The remote station was "bidirectional pp" while the local station was "unidirectional pp"
Root Cause
First, we began by establishing whether the optical connections were right. They were found to be okay. Then we checked the parameter of the tributary unit and it was found that both sides had protection. We resent the configuration again to both stations. When we tested again we found the same results as above. Now we resorted to use the ?echnical support quality inspection file?to see if we root out the problem. The local station had no problem and the software inspection passed. Then we checked the remote station and it was found that one of its NE parameters was wrongly set. It indicated Bidirectional PP while the other station had Unidirectional PP. The configuration file of the remote station was corrected and downloaded. When we tested for the path protection again the expected results were found.

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