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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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BEFFEC_EXC

BEFFEC_EXC

Description

The BEFFEC_EXC is an alarm that forward error correction (FEC) signals are degraded.

Attribute

Alarm Severity Alarm Type

Minor

Service alarm

Parameters

None.

Impact on the System

When the BEFFEC_EXC alarm occurs, the service transmission performance is affected.

Possible Causes

The possible causes of the BEFFEC_EXC alarm are as follows:

  • A higher-level alarm, such as the R_LOS or FEC_LOF, occurs in the system.
  • The optical power is improper.
  • The transmission fiber is faulty.
  • The transmit unit at the opposite station is faulty.
  • The board at the local station is faulty.

Procedure

  1. Check whether any higher-level alarm, such as the R_LOS or FEC_LOF, occurs on the board. If yes, take priority to clear it, and then check whether the BEFFEC_EXC alarm is cleared.
  2. If the alarm persists, clean the fiber connector, and then check whether the BEFFEC_EXC alarm is cleared.
  3. If the alarm persists, check the input optical power. Moreover, you can add or remove some optical attenuators so that the optical power is proper.
  4. If the alarm persists, check the launched optical power at the opposite end. If the optical power is extremely low, replace the optical module on the board or the line board at the opposite end.
  5. If the alarm persists, check whether the fiber is damaged. If yes, replace the fiber, and then check whether the BEFFEC_EXC alarm is cleared.
  6. If bit errors still occur, replace the line board that reports bit errors at the local station.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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