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).
SUM_INPWR_LOW

SUM_INPWR_LOW

Description

Sum input optical power is excessively low. The alarm is generated when the input optical power of the multiplexed signals is lower than the threshold.

Attribute

Alarm Severity Alarm Type

Major

Communication alarm

Parameters

None

Impact on the System

The output optical signals of a single channel of the board may be lost; the services in use may have bit errors or even are interrupted.

Possible Causes

  • Cause 1: The output optical power of the upstream station decreases, and therefore the input optical power of the local station is excessively low.

  • Cause 2: The line attenuation is excessively high, or related fiber jumpers or fiber connectors are dirty.

  • Cause 3: The board that reports this alarm is faulty.

Procedure

  • Check the alarm information on the NMS and record the IDs of the port and channel where the alarm is generated.
  • Cause 1: The output optical power of the upstream station decreases and therefore the input optical power of the local station is excessively low.
    1. On the NMS, check the output optical power of the boards at the upstream station along the reverse direction of the signal flow. If the output optical power of a certain board is excessively low, adjust the output optical power of the board to a value within the normal range.
    2. If the alarm persists, replace the board whose output optical power is excessively low.
    3. Check whether this alarm is cleared. If the alarm persists, see the alarm handling procedure for cause 2.
  • Cause 2: The line attenuation is excessively high, or related fiber jumpers or fiber connectors are dirty.
    1. If the output optical power of all the boards at the upstream stations is normal, check whether an optical attenuator with excessively high attenuation is attached to the receive optical interface on the board that reports this alarm. If yes, decrease the attenuation of the optical attenuator to a proper value or replace the optical attenuator with a proper one.
    2. If the alarm persists, check whether the attenuation of the built-in VOA in the upstream boards is excessively high. If yes, adjust the attenuation of the VOA to a proper value.
    3. If the alarm persists, check whether related fibers or fiber connectors are dirty. If yes, replace the fiber jumpers or check and clean the fiber connectors.
    4. If the alarm persists, the optical cables between stations may be faulty. In this case, rectify the fault on the optical cables.
    5. Check whether this alarm is cleared. If the alarm persists, see the alarm handling procedure for cause 3.
  • Cause 3: The board that reports this alarm is faulty.
    1. If the alarm persists, replace the faulty board.
    2. Check whether this alarm is cleared. If the alarm persists, contact Huawei for help.

Related Information

None

Translation
Download
Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 75774

Downloads: 138

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