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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).
DOWN_T1_AIS

DOWN_T1_AIS

Description

The DOWN_T1_AIS alarm is an indication alarm of downstream 1.5 Mbit/s signals. This alarm is generated when the tributary board detects that the values of downstream T1 signals are all 1.

Attribute

Alarm Severity Alarm Type

Minor

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 optical port number. The parameter has a fixed value of 0x01.

Parameter 2, Parameter 3

Indicates the path ID.

Impact on the System

The T1 signals in the board path are unavailable.

Possible Causes

Possible causes of this alarm are as follows:

  • The local end reports a high-level alarm, such as R_LOS, R_LOC, R_LOF, or MS_AIS.
  • The tributary board at the opposite end reports the UP_T1AIS or T_ALOS alarm.
  • The tributary board at the local end is faulty.
  • The cross-connect unit at the local end is faulty.

Procedure

  1. View the DOWN_T1_AIS alarm on the U2000 to determine the board that reports the alarm.
  2. Check whether the local end reports a high-level alarm, such as R_LOS, R_LOC, R_LOF, or MS_AIS. If the local end reports a high-level alarm, clear the alarm. Then, check whether the DOWN_T1_AIS alarm is cleared.
  3. On the U2000, check whether the tributary board at the opposite end reports the UP_T1AIS or T_ALOS alarm. If the tributary board reports the UP_T1AIS or T_ALOS alarm, clear the alarm. Then, check whether the DOWN_T1_AIS alarm is cleared.
  4. If the DOWN_T1_AIS alarm persists, perform a cold reset on the tributary board that reports the alarm at the local end. Then, check whether the DOWN_T1_AIS alarm is cleared.

    If the services traveling through the board are not configured with protection, cold reset of the board interrupts the services.

  5. If the alarm persists, replace the tributary board that reports the DOWN_T1_AIS alarm at the local end. Then, check whether the DOWN_T1_AIS alarm is cleared.
  6. If the alarm persists, perform a cold reset on the system control, cross-connect, and timing board at the local end. Then, check whether the DOWN_T1_AIS alarm is cleared.

    If there is not a standby system control, cross-connect, and timing board that properly functions for protection, cold reset of a system control, cross-connect, and timing board may interrupt services.

  7. If the DOWN_T1_AIS alarm persists, replace the system control, cross-connect, and timing board at the local end. Then, check whether the DOWN_T1_AIS alarm is cleared.

Related Information

None.

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Updated: 2019-01-21

Document ID: EDOC1100020975

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