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).
R_LOF

R_LOF

Description

The R_LOF alarm indicates loss of frame in the signals received by the line board at the optical interface.

Attribute

Alarm Severity Alarm Type

Critical

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 interface number.

Impact on the System

When the R_LOF alarm occurs, the frame in the signals received by the line board at the optical interface is lost. As a result, the services at the interface are unavailable. If the automatic MSP switching or the path protection switching is configured, the alarm will trigger the protection switching. If the optical interface that reports the R_LOF alarm is the current synchronization clock source for the NE, the synchronization clock source switching will occur.

When the R_LOF alarm occurs, the board reports the MS_RDI alarm to the opposite station.

Possible Causes

Possible causes of the R_LOF alarm are as follows:

  • The rates of the optical interfaces at both ends are inconsistent.
  • The fiber connector is loose or dirty.
  • The transmission fiber cable is faulty.
  • The attenuation of the received signal is excessive.
  • The signals transmitted at the opposite station do not have the frame structure.
  • The receive part at the local station is faulty.

Procedure

  1. Check the rates of the optical interfaces at both ends of the fiber. If the rates are inconsistent, replace the optical modules to ensure that the rates are consistent.
  2. Check whether the fibers are intact and whether the fiber connectors are in good contact. Replace the fiber or clean the fiber connectors.
  3. Check whether the transmission fiber cable is faulty. If the fiber cable is faulty, replace it with a new one.
  4. Rectify the fault of the fibers. View alarms on the NMS to check whether the R_LOF alarm is cleared.
    If... Then...
    The alarm is cleared The fault is rectified.
    The alarm persists Go to the next step.
  5. Check the levels of the optical interfaces configured at the line boards. If the levels are different, change them and apply the configurations.
  6. View alarms on the NMS to check whether the R_LOF alarm is cleared.
    If... Then...
    The alarm is cleared The fault is rectified.
    The alarm persists Go to the next step.
  7. Check whether the transmitted signals of the opposite line boards are normal. Perform loopback for the optical interfaces of the opposite line board to check whether the R_LOF is reported. If the opposite line board is faulty, replace the board.
  8. Rectify the fault of the opposite line board. View alarms on the NMS to check whether the R_LOF alarm is cleared.
    If... Then...
    The alarm is cleared The fault is rectified.
    The alarm persists Go to the next step.
  9. If the local line board is faulty, replace it.

Related Information

None.

Translation
Download
Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 74957

Downloads: 136

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