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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
LPES

LPES

Performance Event Meaning

The LPES event indicates the lower-order path errored second.

Performance Event Attributes

Performance Event ID Performance Event Type

0x91

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 LPES event occurs when one of the following requirements is met: 1. One or multiple bit error blocks are detected in one second. 2. The LP_UNEQ, LP_TIM, TU_AIS, and TU_LOP alarms are detected on the path. 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

BIP_EXC

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

BIP_SD

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

B3_EXC

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

B3_SD

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

LP_UNEQ

Indicates that the lower-order path is not equipped.

LP_TIM

Indicates that the lower-order path tracking identifiers mismatch.

TU_AIS

Indicates the TU alarm indication signal.

TU_LOP

Indicates the TU loss of pointer.

Procedure

  1. When the LP_UNEQ alarm occurs:
    1. Check whether the services at the opposite and local stations are correctly configured. If not, modify the service configurations and apply them again.
    2. Check whether the attributes of the tributary boards at local and opposite stations are correctly configured. If not, modify the attribute configurations and apply them again.
    3. Check whether the opposite or local station is faulty by looping back the fiber.
    4. If the opposite station is faulty, replace the relevant tributary board, line board, and system control, switching, and timing board in turn.
    5. If the local station is faulty, replace the tributary unit and cross-connect unit in turn.
    6. Check whether the attributes of the tributary boards at local and opposite stations are correctly configured.
  2. When the LP_TIM alarm occurs:
    1. Check whether the trace identifier of the corresponding lower-order path of the opposite tributary board is the same as that of the local tributary board. If not, modify the configuration and apply it again.
    2. Check whether the services at the opposite and local stations are correctly configured. If not, modify the service configurations and apply them again.
    3. Check whether the opposite or local station is faulty by looping back the fiber.
    4. If the opposite station is faulty, replace the relevant tributary board, line board, and system control, switching, and timing board in turn.
    5. If the local station is faulty, replace the tributary unit and cross-connect unit in turn.
  3. When the TU_AIS alarm occurs:
    1. Check whether any section-level or higher-level alarm occurs on the local line board that is configured with the lower-order services to the tributary board. If yes, clear the alarm according to the relevant method.
    2. Check whether the PDH alarm occurs at the port that is configured with interconnection services on the opposite tributary board. If yes, first rectify the fault of the interconnected PDH equipment.
    3. Check whether the services are correctly configured. If not, modify the service configurations and apply them again.
    4. Check whether the opposite or local station is faulty by looping back the fiber.
    5. If the opposite station is faulty, replace the relevant tributary board, line board, and system control, switching, and timing board in turn.
    6. If the local station is faulty, replace the tributary unit and cross-connect unit in turn.
  4. When the TU_LOP alarm occurs:
    1. Check whether the cross-connect unit or the tributary unit is correctly configured. If not, modify the configuration and apply it again.
    2. Check whether the opposite or local station is faulty by looping back the fiber.
    3. If the opposite station is faulty, replace the relevant tributary board, line board, and system control, switching, and timing board in turn.
    4. If the local station is faulty, replace the tributary unit and cross-connect unit in turn.
  5. See LPBBE.

Reference

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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