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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Performance Event Meaning

The MSES event indicates the multiplex section errored second.

Performance Event Attributes

Performance Event ID Performance Event Type


SDH performance event

Impact on the System

If bit errors occur in the services, identify the causes and rectify the fault immediately. Otherwise, alarms will be generated and the signal transmission quality will be affected. If bit errors exceed the B2 bit error threshold-crossing threshold and degrade threshold, the B2_EXC and B2_SD alarms will be generated.

Possible Causes

The MSES event occurs when one or multiple bit error blocks are detected in one second or when the R_LOS, R_LOF, or MS_AIS alarm is detected.

External causes:

  • The fiber performance is degraded, and the fiber has high attenuation.

  • The fiber connector is dirty or incorrect.
  • The equipment is poorly grounded.
  • There is a severe interference source around the equipment.
  • The working temperature is high or low, and the opposite equipment cannot tolerate such temperature.

Equipment problems:

  • The signal attenuation on the receive side of the line board is excessive, the transmit circuit at the opposite end is faulty, or the receive circuit at the local end is faulty.

  • The synchronization performance of the clock is poor.
  • The cross-connect unit and the line board poorly match.
  • The board becomes faulty, or the performance of the board is degraded.

Relevant Alarms

Alarm Name Correlation


Indicates that B2 bit errors crossing the threshold.


Indicates signals degraded (B2).


Indicates that the signal on the receiver line side is lost.


Indicates that the out-of-frame fault occurs on the receiver line side.


Indicates multiplex section alarm indication.


  1. If the R_LOS or R_LOF alarm occurs, a fiber cut, severe attenuation, received overload, or faulty board may exist.
    1. Add an attenuator if the received optical power is overloaded.
    2. Check the fiber and optical connector. Clean the fiber connector.
    3. Replace the board.
  2. If the MS_AIS alarm occurs:
    1. Check whether the transmit end of the line board at the opposite station is configured with insertion of the MS_AIS alarm. If yes, cancel the setting.
    2. Check whether the transmit unit of the line board at the opposite station is faulty.
    3. Check the line board of the local station. Perform a reset to the board or replace the board. Then check whether the alarm is cleared. Perform a fiber self-loop to check whether the opposite line board reports the MS_AIS alarm.
    4. Check the line unit of the local station. Reset the board. If the alarm persists, replace the board, and then check whether the alarm is cleared.
  3. See MSBBE, B2_EXC, or B2_SD.



Updated: 2019-01-21

Document ID: EDOC1100020975

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