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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Performance Event Meaning

The LPFESES event indicates the lower-order path far end severely 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 but no related alarms are reported on the remote NE, the system will not be affected. However, it is required to identify the causes and rectify the fault immediately. Otherwise, alarms will be generated and the signal transmission quality will be affected.

Possible Causes

The LPFESES event occurs when one of the following requirements is met: 1. Not less than 30% bit errors are contained in the message returned in one second. 2. At least one severely disturbed period (SDP) occurs. SDP occurs when the BER of all the continuous blocks in a period of at least four consecutive blocks or 1 ms (select the shorter period) is lower than 10-2, or when the LP_RDI alarm occurs. When the service is at the VC-12 level, the third bit of the V5 byte is verified. When the service is at the VC-3 level, the G1 byte is verified.

External causes:

  • On the opposite equipment, the fiber performance is degraded, and the fiber has high attenuation.

  • The fiber connector is dirty or incorrect at the opposite station.
  • The opposite equipment is poorly grounded.
  • 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, or the cross-connect and the tributary board poorly match at the opposite station.
  • The tributary board of the opposite equipment is faulty.
  • The fan of the opposite equipment becomes faulty.
  • The board of the opposite equipment becomes faulty or the performance of the board is degraded.

Relevant Alarms

Alarm Name Correlation


Bit errors occur on the lower-order path at the remote end.


Lower-order path remote defect indication


  1. See LPFEES.



Updated: 2019-01-21

Document ID: EDOC1100020975

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