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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).
MAC_FCS_EXC

MAC_FCS_EXC

Description

The MAC_FCS_EXC alarm indicates that a bit error threshold-crossing event is detected at the MAC layer. The software periodically detects the number of bytes received by the MAC chip and the number of bytes that have bit errors. This alarm is reported when the number of bit errors crosses the threshold.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

None.

Impact on the System

When the MAC_FCS_EXC alarm occurs, services degrade or even are interrupted.

Possible Causes

The possible causes of the MAC_FCS_EXC alarm are as follows:

  • Cause 1: Line signals deteriorate.
  • Cause 2: The transmit optical power at the peer end is abnormal, which may be caused by a dirty fiber connector or fiber performance deterioration.
  • Cause 3: The receive optical power at the local end is abnormal, which may be caused by a dirty fiber connector or fiber performance deterioration.

Procedure

  • Cause 1: Line signals deteriorate.
    1. On the NMS, check whether the DOS attack exists. If yes, eliminate the source that transmits a large amount of invalid data, and then check whether the MAC_FCS_EXC alarm is cleared.
    2. If the alarm persists, check whether the cable or fiber is faulty. If yes, replace the faulty cable or fiber, and check whether the MAC_FCS_EXC alarm is cleared.
    3. If the alarm persists, go to Cause 2.
  • Cause 2: The transmit optical power at the peer end is abnormal, which may be caused by a dirty fiber connector or fiber performance deterioration.
    1. On the NMS, check whether the transmit optical power at the peer end is within the normal range.

      If...

      Then...

      The transmit optical power is beyond the normal range

      Go to the next step.

      The transmit optical power is within the normal range

      Go to Cause 3.

    2. Check the jumper connectors and fiber connectors.

      • Check whether the fiber connector is properly connected. Ensure that the fiber connector is installed securely. Check whether the alarm is cleared.
      • If the alarm persists, see Cleaning the Optical Fiber Connector and check whether the fiber connector is clean. If the fiber connector is dirty, clean it.

    3. If the alarm persists, check whether the attenuation value of the optical attenuator is proper.

      If...

      Then...

      The attenuation value of the optical attenuator is improper

      Adjust the value properly. Check whether the alarm is cleared. If the alarm persists, go to the next step.

      The attenuation value of the optical attenuator is proper

      Go to the next step.

    4. Check whether the flange is correctly connected. Ensure that the flange is correctly connected, and then check whether the alarm is cleared.
    5. If the alarm persists, replace the optical module located at the transmit port of the peer NE.
    6. If the alarm persists, check whether the service processing board and cross-connect board of the peer NE report hardware-related alarms, such as HARD_BAD and TEMP_OVER. If yes, replace the board that reports a hardware-related alarm. Then, check whether the alarm is cleared. If the alarm persists, go to Cause 3.
  • Cause 3: The receive optical power at the local end is abnormal, which may be caused by a dirty fiber connector or fiber performance deterioration.
    1. On the NMS, check whether the receive optical power at the local end is within the normal range. For details, see 1 in Cause 2.
    2. If the receive optical power is beyond the normal range, see 2 to 6 in Cause 2 for troubleshooting at the local end.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75654

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