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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The TPS_ALM is an alarm of TPS protection switching.


Alarm Severity Alarm Type


Equipment 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

The value is always 0x01, Indicates the page number that performs the switching.

Impact on the System

During the service data transmission, if the TPS protection groups are configured and they work normally, the system performs the automatic switching when the HARD_BAD alarm is reported due to the hardware fault of the working board or the working board is performed the hard reset. When the TPS protection groups are in the automatic switching state, the services are transiently interrupted.

Possible Causes

The possible causes of the TPS_ALM alarm are as follows:

  • The hardware of the working board is faulty, and the TPS automatic switching occurs.
  • The hardware of the working board is not faulty. The TPS switching command is issued, however, and services are switched from the working board to the protection board.


  1. Check whether the TPS switching command is manually issued.

    • If yes, issue the command to clear the TPS switching. Accordingly, services are switched from the protection board to the working board and the TPS_ALM alarm is automatically cleared.
    • If not, check whether there is the HARD_BAD alarm reported from the working board. If yes, it indicates that the hardware of the working board is faulty. After the HARD_BAD alarm is cleared, the services are switched from the protection board to the working board and then the TPS_ALM alarm is cleared.

  2. For the tributary boards. Replace the working board and perform the service switching to the working board. The TPS_ALM alarm is automatically cleared.
Updated: 2019-01-21

Document ID: EDOC1100020975

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