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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).
ALM_GFP_dLFD

ALM_GFP_dLFD

Description

The ALM_GFP_dLFD is an alarm indicating the GFP frame signal is lost. This alarm is generated when the GFP state machine leaves the SYNC state, and the generated ALM_GFP_dLFD alarm is cleared when the GFP state machine enters the SYNC state again.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

When you view an alarm on the network management system, select the alarm. In the Alarm Details field display the related parameters of the alarm. The alarm parameters are in the following format: Alarm Parameters (hex): parameter1 parameter2...parameterN. For details about each parameter, refer to the following table.

Name Meaning

Parameter 1

The ID of the logical port, and the value is always 0x01.

Parameter 2, parameter 3

Indicate the VCTRUNK number where the alarm occurs.

Impact on the System

During data transmission, if the board fails to align the GFP frame, the services are interrupted.

Possible Causes

The possible causes of the ALM_GFP_dLFD alarm are as follows:

  • Cause 1: The settings of timeslots and other parameters of the VCTRUNKs at both ends are inconsistent.
  • Cause 2: The performance of the service transmission line degrades.
  • Cause 3: A certain board is faulty.

Procedure

  1. Cause 1: The settings of timeslots and other parameters of the VCTRUNKs at both ends are inconsistent.
    1. Check whether the number of uplink (or downlink) timeslots bound with the VCTRUNK at the local end is consistent with the number of downlink (or uplink) timeslots bound with the VCTRUNK at the opposite end.

      If...

      Then...

      The number of timeslots at the local end is inconsistent with the number of corresponding timeslots at the opposite end

      Increase or decrease Number of Bound Paths as required to ensure the consistency. Check whether the alarm is cleared. If the alarm persists, go to the next step.

      The number of timeslots at the local end is consistent with the number of corresponding timeslots at the opposite end

      Go to the next step.

    2. Select the relevant NE. Choose Configuration > SDH Service Configuration from the Function Tree.
    3. Check whether the number of timeslots bound with the VCTRUNK is consistent with the settings of the cross-connections.

      If...

      Then...

      The number of timeslots bound with the VCTRUNK is inconsistent with the settings of the cross-connections

      Reset the number of timeslots bound with the VCTRUNK or cross-connections. Check whether the alarm is cleared. If the alarm persists, go to the next step.

      The number of timeslots bound with the VCTRUNK is consistent with the settings of the cross-connections

      Go to the next step.

    4. Check whether the service levels of the SDH cross-connections are the same at both ends. If the service level of the SDH cross-connections at the local end is VC-12 and the service level of the SDH cross-connections at the opposite end is VC-4, the ALM_GFP_dLFD alarm is reported. Thus, you need to reconfigure the cross-connect service level in the case of the inconsistency.
    5. Check whether the alarm is cleared. If the alarm persists, go to 2.
  2. Cause 2: The performance of the service transmission line degrades.
    1. The performance of the transmission line degrades if the fiber connector is loose or dirty, the fiber or cable is faulty, or the components for the transmission are not in good contact. Check whether the alarms related to errors and optical power and the performance events related to errors occur in the service transmission line.

      If...

      Then...

      The BIP_EXC, BIP_SD, B3_EXC, B3_SD, HPBBE, LPBBE, or IN_PWR_ABN occurs

      Take priority to clear the preceding alarms or performance events. Check whether the alarm is cleared. If the alarm persists, go to 3.

      The preceding alarms or performance events do not occur

      Go to 3.

  3. Cause 3: A certain board is faulty.
    1. Replace the board directly.
    2. Check whether the alarm is cleared. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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