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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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SYNC_C_LOS

SYNC_C_LOS

Description

The SYNC_C_LOS alarm indicates that the clock source of the clock board that is set in the clock source priority table is lost.

Attribute

Alarm Severity Alarm Type

Warning

Equipment 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 clock source number.

  • 0xf0: External clock source.
  • 0xf1: Internal clock source.
NOTE:
Two bytes are occupied for each clock source. The first byte indicates the slot ID, which starts from 1. The second byte indicates the optical interface number.

Impact on the System

When the SYNC_C_LOS alarm occurs, the clock source of the clock board set in the clock source priority table is lost. As a result, the clock source of higher priority is unavailable and the clock source switching may occur.

Possible Causes

Possible causes of the SYNC_C_LOS alarm are as follows:

  • If the higher-level clock source is unavailable, the fiber cut occurs (in the case of tracing the line clock source) or there is no input of the external clock source (in the case of tracing the external clock source).

  • The cold reset is performed on the board of the access clock source, or the upstream traced clock source board is faulty.
  • The clock source switching in the S1 byte mode occurs at the local station.
  • The input of the external clock source (BITS) changes.

Procedure

  1. View alarms on the U2000 to check whether there are alarms that are caused by the loss of clock source on the local NE.

    If... Then...
    There is the R_LOS, R_LOC, R_LOF, or T_ALOS alarm See the corresponding section in this document to clear the alarm.
    There is no alarm Go to step 3.

  2. View alarms on the U2000 to check whether the SYNC_C_LOS alarm is cleared.

    If... Then...
    If the alarm is cleared No further action is required.
    If the alarm persists Go to the next step.

  3. If the priority level table is not correctly configured, configure the clock source priority table again.
  4. View alarms on the U2000 to check whether the SYNC_C_LOS alarm is cleared.

    If... Then...
    If the alarm is cleared No further action is required.
    If the alarm persists Go to the next step.

  5. If the line clock source is traced, check whether the quality of the upstream clock source changes. If the external clock source is traced, check whether the external clock source works normally. Refer to S1_SYN_CHANGE.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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