No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

Rate and give feedback:
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).
DDN_LMFA

DDN_LMFA

Description

The DDN_LMFA is an alarm indicating the loss of mulitframe alignment in the PDH framed E1 services on the DDN side. When the DNN side fails to receive the multiframe alignment signals in the framed E1 services, the DDN_LMFA alarm is reported.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

None

Impact on the System

  • When the DDN_LMFA alarm occurs, the E1 services of the board are unavailable.
  • The DDN_RMFA alarm is returned to the opposite end.

Possible Causes

The possible causes of the DDN_LMFA alarm are as follows:

  • The DDN equipment interconnected to the path is faulty.
  • The service frame format is incorrectly configured.
  • The board hardware is faulty.

Procedure

  1. View the DDN_LMFA alarm on the U2000 to confirm the relevant board.
  2. Check whether the interconnected DDN equipment works well by performing loopback to the equipment cable. If any fault is found, take priority to remove it, and then check whether the DDN_LFA alarm is cleared.
  3. Check whether the frame format of the E1 signals transmitted from the opposite end is consistent with that specified at the local end. Make sure that the service configuration is correct, and that the frame format of the E1 signals matches each other at the two ends. Then check whether the DDN_LMFA alarm is cleared.
  4. If the alarm persists, perform a cold reset on the board. Then check whether the DDN_LMFA alarm is cleared.

    If the services travel through the board are not configured with protection, the services are interrupted after the cold reset of the board.

  5. If the alarm persists, the board is faulty. Replace the board. Then the DDN_LMFA alarm is automatically cleared.

Related Information

None.

Translation
Download
Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 76031

Downloads: 138

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next