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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).
LOF_64K

LOF_64K

Description

The LOF_64K alarm indicates that the local end carrying 64 kbit/s services does not receive any frames from the remote end or overhead frames are lost.

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

Indicates the ID of a hitless protection group.

Parameter 2

Indicates overhead timeslot 27.

Parameter 3

Indicates overhead timeslot 28.

NOTE:
The preceding parameter description applies only to PF4E8 boards. Other boards do not involve any parameters.

Impact on the System

When this alarm occurs, the 64 kbit/s services on the board are unavailable or the E1 hitless protection group is unavailable.

Possible Causes

If there are alarm parameter 1/2/3, it means that the overhead frames are lost, the overhead cross-connection is not set up or the link of the hitless protection group is faulty. Otherwise, the receiving frame of the local end carrying 64K services does not receive any frames from the remote end.

If overhead frames are lost, the following lists the possible causes of the LOF_64K alarm. You must consider cause 1 first.
  • Cause 1: The overhead cross-connection is not set up.

  • Cause 2: The link of the hitless protection group is faulty.

If the local end carrying 64 kbit/s services does not receive any frames from the remote end, LOF_64K is possibly caused by the following:

  • Cause 1: The service frame format is incorrect.

  • Cause 2: The transmit board (including the cross-connect and timing board) at the remote end is faulty, and the frame structure is lost.

  • Cause 3: The receive board at the local end is faulty, and the frame structure is lost.

Procedure

  1. If overhead frames are lost, LOF_64K can be handled as follows:
    1. Cause 1: The overhead cross-connection is not set up.
      1. According to parameter 2, 3, identify the timeslot for which the overhead cross-connection is not set up. On the NMS, use the faulty channel as the source to set up the overhead cross-connection. For details the configuration procedure, see Configuring 64 kit/s Services.
      2. Check whether the LOF_64K alarm is cleared. If the alarm persists, contact Huawei technical support engineers to handle the alarm.
    2. Cause 2: The link of the hitless protection group is faulty.
      1. Check the entire link of the hitless protection group. Replace the optical fiber or optical module connected to the port with an intact optical fiber or optical module, and then check whether the alarm is cleared.
      2. If the alarm is cleared, the original optical fiber or optical module is faulty. Replace the optical fiber or optical module. If the alarm persists, go to the next step.
  2. If the local end carrying 64 kbit/s services does not receive any frames from the remote end, LOF_64K can be handled as follows:
    1. Cause 1: The service frame format is incorrect.
      1. Check whether the frame format is consistently configured for the local and remote ends by checking Serial Port Rate (bps) of the receive and transmit boards. For details, see Configuring a PCM Port in the Configuration Guide (SDH Transport Domain).
      2. Check whether the LOF_64K alarm is cleared. If the alarm persists, go to the next step.
    2. Cause 2: The transmit board (including the cross-connect and timing board) at the remote end is faulty, and the frame structure is lost.
      1. Replace the remote board connected to the alarmed board and check whether the LOF_64K alarm is cleared. If the alarm persists, replace the remote cross-connect and timing board.
      2. Check whether the LOF_64K alarm is cleared. If the alarm persists, go to the next step.
    3. Cause 3: The receive board at the local end is faulty, and the frame structure is lost.
      1. Replace the alarmed board.
      2. Check whether the LOF_64K alarm is cleared. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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