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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The MDL_ALARM is an alarm of power module faults.


Alarm Severity Alarm Type


Equipment 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

Indicates the type of the faulty power module:

  • 0x01: Power module 1.
  • 0x02: Power module 2.

Parameter 2, Parameter 3

Indicates the causes for the faults of the power module. Parameter 2 is the higher byte, and Parameter 3 is the lower byte.

The value of Parameter 2 is always 0x00. The values of Parameter 3 are as follows:

  • 0x01: Power off.
  • 0x02: Fault.
  • 0x03: Protection.
  • 0x04: Communication failure.

Impact on the System

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

Possible Causes

The possible causes of the MDL_ALARM alarm are as follows:

  • Cause 1: The cable connecting the Power Module to the equipment is faulty.
  • Cause 2: The Power Module is faulty.
  • Cause 3: The standby module of the Power Module is faulty.


  1. View the MDL_ALARM alarm on the U2000. Confirm the cause for the fault of the power module according to Parameter 3.
    • In case of power off, power on the system. Then, check whether the MDL_ALARM alarm is cleared.
    • In case of hardware faults, replace the CAU board.
    • In case of communication failure, detect the failure cause and troubleshoot it. Then, check whether the MDL_ALARM alarm is cleared.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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