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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Performance Event Meaning

The LPBBE event indicates the lower-order path block of background error.

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 BIP bit error threshold-crossing threshold and degrade threshold, the BIP_EXC and BIP_SD alarms will be generated.

Possible Causes

The LPBBE event is an errored block not occurring as part of lower-order path unavailable time and lower-order path severely errored second. When the service is at the VC-12 level, the first two bits of the V5 byte are verified. When the service is at the VC-3 level, the B3 byte is verified.

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.
  • A severe interference source is present near 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 unit or the cross-connect unit and the tributary unit poorly match.
  • The tributary unit is faulty.
  • The board becomes faulty, or the performance of the board is degraded.

Relevant Alarms

Alarm Name Correlation


Indicates that the BIP bit errors cross the threshold when the service level is VC-12.


Indicates that the BIP signal degraded when the service level is VC-12.


Indicates BIP excessive errors when the service level is VC-3.


Indicates that the higher-order path (B3) signal degraded when the service level is VC-3.


  1. Eliminate external causes, such as poor grounding, high operating temperature, low or high received optical power of the line board. Then, check whether bit errors occur on the line boards.
  2. If all the line boards of an NE have bit errors, the clock unit may be faulty. In this case, replace the CXL board.
  3. If only a line board reports that bit errors exist, the local line board may be faulty or that the opposite NE or fibers are faulty. Locate the faulty board and replace it.
  4. If only the tributary reports bit errors, the problem may lie in the cooperation of the cross-connect unit and tributary unit at the local station. Replace the board to verify the faulty point and rectify the fault.



Updated: 2019-01-21

Document ID: EDOC1100020975

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