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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).
PTP_TIMESTAMP_ABN

PTP_TIMESTAMP_ABN

Description

The PTP_TIMESTAMP_ABN alarm indicates an abnormality of the PTP timestamp. This alarm is reported when the PTP timestamp remains unchanged.

Attribute

Alarm Severity Alarm Type

Major

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

  • 0x02: Timestamp t1 remains unchanged in 3 consecutive seconds.
  • 0x03: Timestamp t2 remains unchanged in 3 consecutive seconds.
  • 0x04: Timestamps t1 and t2 remain unchanged in three consecutive seconds.

Parameter 2

  • 0x02: Timestamp t3 remains unchanged in 17 consecutive seconds.
  • 0x03: Timestamp t4 remains unchanged in 17 consecutive seconds.
  • 0x04: Timestamps t3 and t4 remain unchanged in 17 consecutive seconds.

Impact on the System

When this alarm occurs, the timestamp remains unchanged and the NE time cannot trace the time of the upstream NE so that bit errors occur in services.

Possible Causes

The possible causes of the PTP_TIMESTAMP_ABN alarm are as follows:

  • Cause 1: A fault occurs at transmit end field programmable gate array (FPGA) or on the clock module.
  • Cause 2: A fault occurs on the bus or clock module at the receive end.
  • Cause 3: The Sync packet transmission frequency is lower than 8 packets per second on the upstream NE when IEEE 1588 frequency synchronization is configured.
  • Cause 4: The Sync packet transmission frequency is lower than 1 packets per second on the upstream NE when physical-layer synchronization and IEEE 1588 synchronization is configured.

Procedure

  1. Cause 1: A fault occurs at transmit end field programmable gate array (FPGA) or on the clock module.
    1. On the NMS, check whether the HARD_BAD alarm is reported by the board on which the port sending IEEE 1588 packets resides. If yes, clear it first.
    2. Check whether the alarm is cleared. If the alarm persists, go to 2.
  2. Cause 2: A fault occurs on the bus or clock module at the receive end.
    1. On the NMS, check whether the HARD_BAD or BUS_ERR alarm is reported by the board on which the port receiving IEEE 1588 packets resides. If yes, clear it first.
    2. Check whether the alarm is cleared. If the alarm persists, go to 3.
  3. Cause 3: The Sync packet transmission frequency is lower than 8 packets per second on the upstream NE when IEEE 1588 frequency synchronization is configured.
    1. In the NE Explorer, select the desired NE and choose Configuration > Clock > PTP Clock > Clock Synchronization Attribute from the Function Tree. Click the Port Message tab. On the SYNC Packet Period(s) drop-down menu, configure the upstream node to transmit over eight Sync packets per second and click Apply. Then check whether the alarm is cleared.
    2. If the alarm persists, go to 4.
  4. Cause 4: The Sync packet transmission frequency is lower than 1 packets per second on the upstream NE when physical-layer synchronization and IEEE 1588 synchronization is configured.
    1. In the NE Explorer, select the desired NE and choose Configuration > Clock > PTP Clock > Clock Synchronization Attribute from the Function Tree. Click the Port Message tab. On the SYNC Packet Period(s) drop-down menu, configure the upstream node to transmit over one Sync packet per second and click Apply. Then check whether the alarm is cleared.
    2. If the alarm persists, contact Huawei technical support engineers to handle the alarm.

Related Information

The Sync and Delay messages are used for end-to-end delay measurement and time synchronization.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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