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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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NULL signals (with payload being "0"s) being sent out. When the NULL mapping status of the board is enabled, the NULL_SEND alarm is generated, indicating that the NULL signals are being sent out.


Alarm Severity Alarm Type


Equipment alarm



Impact on the System

When this alarm is generated, the board that reports the alarm is sending out NULL signals and the peer station will receive the NULL signals, interrupting services.

Possible Causes

The NULL Mapping Status parameter of the board is set to Enabled.


  1. Check the NULL mapping status of the board that reports the alarm. If the NULL mapping status is enabled, change the value from Enabled to Disabled.


    If the NULL mapping status needs to be enabled in the actual situation, suppress the alarm and then disable the NULL mapping status. After that, configure the NULL_SEND alarm to be monitored.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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