Description of the problem

Network elements A and B are Huawei OSN3500 devices, and port 1 of the 4-slot PQ1 of A and port 23 of the 2-slot PQ1 of B are jumpered on a DDF shelf. After the hopping, the first 2M of slot PQ1 of network element A keeps flashing TX_E1_LOC alarm, which triggers TPS inversion.

Processing

1. The query reveals that port 1 of slot PQ1 of network element A4 frequently reports TX_E1_LOC alarms after the hopping is completed, causing the inversion.

2, from the DDF to disconnect 2M, 2 side ports are reported TALOS. respectively, no TX_E1_LOC alarm in the inner ring, indicating that there is no problem with the single board is caused by the external signal is not good.

Root cause

1, the query found that after the jump connected to the network element A4 slot PQ1 port 1 frequently reported TX_E1_LOC alarm, caused by the inversion.

2, from the DDF to disconnect the 2M, the 2 side ports are reported TALOS. respectively, no TX_E1_LOC alarms in the inner ring, indicating that there is no problem with the single board is caused by the external signal is not good.

Solution

1, the query found that after the jump connected to the network element A4 slot PQ1 port 1 frequently reported E1LOC alarms, caused by the inversion.

2. Disconnect 2M to report TALOS without E1LOC alarm and no TPS inversion occurs.

3, self-loop no E1LOC alarm, indicating that there is no problem with the single board is caused by a bad external signal.

4, after the discovery of 2M hopping plug in the middle of a test plug, the plug will be removed after the TX_E1_LOC is no longer reported, there is no TPS inversion occurs.

Suggestions and Summary

After the test, remove the test plug from the DDF frame, otherwise it will affect the transmission of 2M signals.

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