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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Performance Event Meaning

The VC3FEES event indicates the VC-3 far end 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 on a remote NE, identify the causes and rectify the fault immediately. Otherwise, alarms will be generated and the signal transmission quality will be affected.

Possible Causes

The HPFEES event occurs when one or multiple bit errors are returned by the G1 byte in one second or when the HP_RDI alarm is detected on the path.

External causes:

  • The fiber performance degrades and the attenuation is excessive at the opposite station.

  • The fiber connector is dirty or incorrect at the opposite station.
  • The equipment is poorly grounded at the opposite station.
  • There is a severe interference source around the equipment at the opposite station.
  • 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 at the opposite station is excessive, or the transmit circuit at the opposite station is faulty, or the receive circuit at the local station is faulty.

  • The synchronization performance of the clock is poor at the opposite station.
  • The cross-connect unit and the line board poorly match at the opposite station.
  • The fan of the opposite equipment becomes faulty.
  • The board fails or the board performance degrades at the opposite station.

Relevant Alarms

Alarm Name Correlation


VC-3 path remote error indication

LP_RDI_VC3 VC-3 path remote defect indication


  1. If the LP_RDI_VC3 alarm occurs:
    1. Check whether the line board of the opposite station receives an alarm such as TU_AIS, TU_LOP, LP_TIM, and LP_UNEQ. If yes, first clear the alarm.
    2. If the line board of the opposite station does not receive an alarm such as TU_AIS, TU_LOP, LP_TIM, and LP_UNEQ, or if the local station still reports the LP_RDI_VC3 alarm after the opposite station ends this kind of alarm, check whether the opposite station or the local station is faulty by looping back the fibers.
    3. If the receive unit of the opposite station is faulty, replace the relevant Ethernet board, and system control, switching, and timing board in turn.
    4. If the transmit part of the local station is faulty, replace the system control, switching, and timing board.
  2. See VC3FEBBE.



Updated: 2019-01-21

Document ID: EDOC1100020975

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