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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The C2_VCAIS is a C2 byte alarm indication. If a board has detected that the value of the received C2 byte is all "1"s, the C2_VCAIS alarm is reported.


Alarm Severity Alarm Type


Service 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, Parameter 2

Indicates the slot number of the board where the alarm is reported.

Parameter 3

Indicates the subboard number, Parameter 3 is always 0xFF.

Parameter 4

Indicates the optical port number of the board.

Parameter 5, Parameter 6

Indicates the path number.

Impact on the System

The services are interrupted.

Possible Causes

The possible causes of the C2_VCAIS alarm are as follows:

The value of the C2 byte to be transmitted is incorrectly configured at the remote end.


  1. Confirm the VC path that reports the alarm according to the alarm parameters.
  2. Check whether the value of the C2 byte to be transmitted is correctly configured at the remote end. If not, modify it, and then check whether the C2_VCAIS alarm is cleared.
  3. If the alarm persists, replace the transmit board at the remote end.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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