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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The CRC4_ERR_OVER is an alarm indicating that the errors of CRC4 check for the E1 services cross the threshold. This alarm occurs when the accumulated number of CRC4 check errors for the E1 services reaches or exceeds 12000 per minute.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

When the CRC4_ERR_OVER alarm occurs, the transmission quality of the E1 services is downgraded.

Possible Causes

The possible causes of the CRC4_ERR_OVER alarm are as follows:

  • The transmit unit of the opposite station is faulty. Accordingly, errors occur in the CRC4 check for the E1 services accessed to the local end.
  • The hardware fault of the board causes errors to occur in the CRC4 check for the E1 services.


  1. View the CRC4_ERR_OVER alarm on the U2000, and then confirm the path number according to the alarm parameters.
  2. Make sure that the accessed E1 services in the path are correct and no CRC4 check errors occur. Then check whether the CRC4_ERR_OVER alarm is cleared.
  3. If the alarm persists, replace the board that generates the alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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