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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The THUNDERALM alarm indicates a surge-protection failure. If the system detects the surge-protection circuit fails, the THUNDERALM occurs.


Alarm Severity Alarm Type


Environment alarm


Name Meaning

Parameter 1

Indicates the power unit that reports the alarm.

  • 0x00: All the power units fail.
  • 0x01: The surge protection of the PIU1 board fails.
  • 0x02: The surge protection of the PIU2 board fails.

Impact on the System

When the THUNDERALM occurs, the system operation and services are not affected, but the surge-protection function fails.

Possible Causes

The cause of the THUNDERALM alarm is as follows:

  • The fuse tube of the surge-protection circuit is interrupted.
  • The board is faulty.


  1. Replace the fuse, and then check whether the alarm is cleared.
  2. Replace the board that reports the THUNDERALM alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75591

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