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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
OA_LOW_GAIN

OA_LOW_GAIN

Description

The OA_LOW_GAIN alarm indicates that the gain of an optical amplifier board decreases. This alarm is reported when the gain of an optical amplifier board is lower than 3 dB, the nominal gain.

Attribute

Alarm Severity Alarm Type

Critical

QoS alarm

Parameters

None

Impact on the System

If the alarm is caused by excessively high input optical power, system redundancy decreases, affecting later capacity expansion.

Possible Causes

  • Cause 1: The input optical power of the board is excessively high.
  • Cause 2: The board that reports the alarmis faulty.

Procedure

  • Cause 1: The input optical power of the board is excessively high.
    1. Query whether the input optical power of the board is within the normal range on the NMS.
    2. If the input optical power is abnormal, adjust the attenuation of the optical attenuator connected to the receive optical port.
    3. If the alarm persists, go to Cause 2.
  • Cause 2: The board that reports the alarmis faulty.
    1. If the alarm persists, replace the faulty board. For details, see Parts Replacement.
    2. If the alarm persists, contact Huawei technical support personnel to handle the alarm.

Related Information

None

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Updated: 2019-01-21

Document ID: EDOC1100020975

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