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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The AUPJCHIGH event indicates the count of positive AU pointer justifications.


Performance Event ID Performance Event Type


SDH performance event

Impact on the System

A small pointer justification does not affect the services, whereas a large pointer justification causes bit errors in the services. If a large pointer justification occurs, identify the causes and rectify the fault immediately. These operations help to prevent alarms and to ensure signal transmission quality.

Possible Causes

External causes:

  • A fiber is incorrectly connected, resulting in a clock loop of the two NEs.

  • If the NEs trace the external clock, check the quality of the external clock.

Human factors:

  • The configuration of the clock source is incorrect. There are two clock sources in one network.

  • The configuration of the clock source tracing priority is incorrect. The clocks of the two NEs trace each other.

Equipment problems:

  • The line board is faulty. As a result, the clock is of poor quality.

  • The clock unit is faulty. As a result, the clock source is of poor quality, or the traced clock source cannot be locked.

Related Alarms

Alarm Name Correlation


Multiplex section adaptation performance threshold crossing alarm


Regenerator section performance threshold crossing alarm


Multiplex section performance threshold crossing alarm


  1. For non-network-wide pointer justifications, check whether fibers are correctly connected.
  2. If the NEs trace the external clock, check the quality of the external clock.
  3. Verify that the configuration is correct.

    Check the configuration items, such as clock ID, SSM protocol, and clock tracing priority.

  4. Analyze pointer justification performance events, and locate the fault by changing the position of the clock source and clock tracing direction. Replace the faulty line board or clock unit.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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