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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The DTR is an alarm indicating that the DCE at the local end has detected the DTE at the opposite end works abnormally. That is, the Data Terminal Ready status at the DTE is abnormal.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

When the DTR alarm occurs, the DCE at the local end does not work. Consequently, the services are interrupted.

Possible Causes

The possible cause of the DTR alarm is as follows:

The DTE at the opposite end works abnormally because the cable is improperly connected, or the service configuration is incorrect.


  1. Check whether the DTE at the opposite end 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 DTE at the opposite end works well, the DTR alarm is automatically cleared.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75250

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