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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The E1_LOC alarm indicates that a tributary board fails to extract the clock from an E1 signal.


Alarm Severity Alarm Type


Equipment alarm



Impact on the System

Services are not affected.

Possible Causes

Possible causes of the E1LOC alarm are as follows:

  • The opposite NE is faulty.
  • The cable wiring sequence is incorrect.
  • The receive unit of the tributary board on the local NE is faulty.
  • The input E1 signal has an abnormal waveform.


  1. Rectify the fault on the opposite NE. Check whether the E1LOC alarm is cleared.
  2. Redo the cable.
  3. If the alarm persists, replace the board where the line unit is located.
  4. If the alarm persists, check whether any external interference causes the abnormal waveform of the E1 signal.
    If... Then...

    There is the external interference

    Contact Huawei technical support engineers.

    There is no external interference

    No further action is required.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75594

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