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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The VCAT_SQM_VC12 alarm indicates SQ mismatch of the VC-12 virtual concatenation.


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 logical port number, and the value is always 0x01.

Parameter 2, Parameter 3

Indicates the VC-12 path number that generates the alarm.

Impact on the System

During the data transmission, the error occurs to the reassembly of the received serial numbers and the framing fails. Accordingly, the services are interrupted.

Possible Causes

Possible causes of the VCAT_SQM_VC12 alarm are as follows:

  • The SQ transmitted from the virtual concatenation at the opposite end is inconsistent with the expected SQ at the local end.

  • Bit errors occur in the SDH physical path or the path is interrupted.


  1. Configure the cross-connect loopback to check whether the alarm is cleared.
  2. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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