Description of the problem

After the Huawei OSN3500 SDH transmission equipment SSN4EGS4 single board enables the external port, the reported ETH_LOS and IN_PWR_LOW alarms do not disappear, and the IN_PWR_LOW alarm is not reported under normal conditions.

Main control board 5.21.18.50

SSN4EGS4 version 1.14

Alarm information

ETH_LOS and IN_PWR_LOW Alarms

Processing

1. Check that the SSN4EGS4 single board does not input signals, and after initializing the network element alarms, the ETH_LOS and IN_PWR_LOW alarms are still reported.

2, check the host and board version to confirm matching, replace the SSN4EGS4 board, the same failure phenomenon

3、After confirming the SSN4EGS4 board version 1.14 software problem, upgrade to version 1.17 to solve the problem.

Root cause

1. False alarm IN_PWR_LOW.

2、Version mismatch

3、Single board failure

4、Software problems

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