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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The ETH_EFM_EVENT alarm indicates that the P2P OAM protocol is enabled and the local end receives an event indication from the opposite end.


Alarm Severity Alarm Type


Communication 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 a link event.

  • 0x01: Indicates an error symbol period.
  • 0x02: Indicates an error frame.
  • 0x03: Indicates an error frame period.
  • 0x04: Indicates error frame seconds.

Impact on the System

Services degrade or are interrupted.

Possible Causes

Possible causes of the ETH_EFM_EVENT alarm are as follows:

  • Boards at both ends work abnormally.
  • The physical link between both ends is faulty.


  1. On the U2000, check whether the opposite NE or the local NE reports any alarms that are related to the hardware of optical modules or boards, such as HARD_BAD and LSR_NO_FITED. If yes, clear these alarms. Then, check whether the ETH_EFM_EVENT alarm is cleared.
  2. If the ETH_EFM_EVENT alarm persists, go to the next step.
  3. Check whether an optical fiber or a cable between the local NE and the opposite NE is damaged. If yes, replace the faulty optical fiber or cable.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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