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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The DCD is an alarm indicating that the data terminal equipment (DTE, namely, the DDN service board) at the local station has detected the abnormal Digital Carrier Detector status.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

When the DCD alarm occurs, the DTE at the local station does not work. Consequently, the services are interrupted.

Possible Causes

The possible causes of the DCD alarm are as follows:

  • The communication line is faulty.
  • The DCE at the opposite station work abnormally, causing abnormal carrier at the DTE at the local station.


  1. Check whether the DCE at the opposite station works well by following the actions:
    1. Check whether the cable is faulty. If yes, remove the fault.
    2. Check whether the service configuration is correct, including the settings of DTE and DCE, inter, slave or exter. Make sure that the service configuration is correct.

      After making sure that the DCE at the opposite station works well, the DCD alarm is automatically cleared.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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