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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).



The PWR_MAJ_ALM is an alarm of power supply overvoltage or undervoltage.


Alarm Severity Alarm Type


Environment alarm


When you view an alarm on the network management system, select the alarm. In the Alarm Details field display the related parameters of the alarm. The alarm parameters are in the following format: Alarm Parameters (hex): parameter1 parameter2...parameterN. For details about each parameter, refer to the following table.

Name Meaning

Parameter 1

  • 0x01: Indicates the power supply 1 which the alarm occurs.
  • 0x02: Indicates the power supply 2 which the alarm occurs.

Parameter 2

  • 0x01: Indicates undervoltage of the power supply.
  • 0x02: Indicates overvoltage of the power supply.

Parameter 3

  • 0x00: Indicates the -220V power voltage.
  • 0x01: Indicates the -48V AC/DC power voltage.
  • 0x02: Indicates the -48V battery voltage.
  • 0x03: Indicates the -5V DC/DC power voltage.

Impact on the System

The PWR_MAJ_ALM alarm affects the power supply of the system. This can cause the NE to be abnormal.

Possible Causes

The possible causes of the PWR_MAJ_ALM alarm are as follows:

  • Cause 1: The AC power is off.
  • Cause 2: The DC power is undervoltaged or overvoltaged.


  1. Cause 1: The AC power is off.
    1. Find the power off cause. Then restore the power supply in a timely manner and check whether the alarm is cleared.
  2. Cause 2: The DC power is undervoltaged or overvoltaged.
    1. Replace the power board.
    2. Check whether the alarm is cleared. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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