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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).
R_LOS

R_LOS

Description

The R_LOS alarm indicates loss of signal at the receive optical interface on the line board.

Attribute

Alarm Severity Alarm Type

Critical

Communication alarm

Parameters

None.

Impact on the System

When the R_LOS alarm occurs, the signal at the receive optical interface on the line board is lost. As a result, the services are interrupted. If the automatic MSP switching or the path protection switching is configured, the alarm will trigger the protection switching. If the optical interface that reports the R_LOS alarm is the current synchronization clock source for the NE, the synchronization clock source switching will occur.

When the R_LOS alarm occurs, the board reports the MS_RDI alarm to the opposite station.

Possible Causes

Possible causes of the R_LOS alarm are as follows:

  • The laser of the opposite line board is disabled.
  • The fiber cut occurs on the connected fibers.
  • The line is heavily attenuated or the optical power is overloaded.
  • The transmitter of the opposite station or line transmission fails.
  • The receive part of the local line board is faulty.

Procedure

  1. Check whether the fibers are intact and whether the fiber connectors are in good contact. Replace the fiber or clean the fiber connectors.
  2. Remove the fault of the fibers. View alarms on the NMS to check whether the R_LOS alarm is cleared.
    If... Then...

    The alarm is cleared

    No further action is required.

    The alarm persists

    Go to the next step.

  3. Check whether the laser of the opposite line board is off, whether the optical power is normal, and whether the transmit signal is normal. If the laser is off, turn it on. If the receive optical power is overloaded, add an attenuator. If the transmit unit of the opposite line board is faulty, replace the opposite optical module and line board.
  4. Remove the fault of the opposite line board. View alarms on the NMS to check whether the R_LOS alarm is cleared.
    If... Then...

    The alarm is cleared

    No further action is required.

    The alarm persists

    Go to the next step.

  5. If the local line board is faulty, replace the optical module and faulty board at the local station.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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