Description of the problem

A Huawei OSN3500 device expands two N2SLQ1 optical boards, both of which are docked with the SQ1 optical boards of 2500+ devices, and finds that the performance query of two optical boards has two optical ports, the network element performance query shows that the optical power received is 220dBm and 222dBm, and the optical power received by the other ports is shown to be normal.

Alarm information

The two abnormal optical ports report the IN_PWR_ABN alarm.

Processing

1, with the optical power meter to measure the optical power is normal, unplug the receiving end of the fiber, the optical port normal report R-LOS, network management performance query received optical power shows -60dBm.

2, the optical module will be unplugged and inserted into the other optical port, display normal, other normal optical module into its position, also normal. Then insert the problem optical module back to the original position, the display is normal.

3, the basic exclusion of equipment and optical module problems, suspect that the optical module and equipment connection problems. Observe another problem optical port, it seems that the optical module is not inserted tightly, unplugged and then re-inserted, the network management display is normal, identified as a result of poor contact with the optical module.

Root cause

1, receiving optical power is too high;

2, the optical module itself is bad;

2, equipment receiving optical detection circuit bad;

3, abnormal network management receiving data.

Recommendations and summary

Usually, the optical module is not plugged into a good performance for reporting LSR_NO_FITED (laser not installed) alarm, this problem is responsible for the transmission of optical power detection data optical module pin contact is not good, resulting in reporting data errors. The site should be more to observe the installation of components, which is also such a problem for more than one idea to deal with.

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