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).
VC3ES

VC3ES

Performance Event Meaning

The VC3ES performance event indicates VC-3 error seconds.

Performance Event Attributes

Performance Event ID Performance Event Type

0x51

SDH performance event

Impact on the System

If bit errors occur in the services, you need to find out the causes and troubleshoot the problem in time. Otherwise, alarms will be generated and the signal transmission quality will be affected. If bit errors exceed the B3 bit error threshold-crossing threshold and degrade threshold, the B3_EXC and B3_SD alarms will be generated.

Possible Causes

The VC3ES performance event occurs when one or multiple bit error blocks are detected in one second or, when the LOS, LOF, and MS_AIS alarms are detected on the optical interface, or when the AU_AIS and AU_LOP alarms are detected over the path.

External causes:

  • The fiber performance is degraded, and the fiber has extremely high attenuation.

  • The fiber connector is dirty or incorrect.
  • The equipment is poorly grounded.
  • There is a strong interference source around the equipment.
  • The working temperature is extremely high or extremely low, and the opposite equipment cannot tolerate such temperature.

Equipment problems:

  • The signal attenuation at the receiving side of the line board is excessive, the transmitting circuit of the opposite end is faulty, or the receiving circuit of the local end is faulty.

  • The synchronization performance of the clock is poor.
  • The cross-connect unit and the line board poorly match.
  • The board becomes faulty, or the performance of the board is degraded.

Relevant Alarms

Alarm Name Correlation

B3_EXC_VC3

B3 bit errors crossing the threshold

B3_SD_VC3 Signals degraded (B3)
R_LOS The signal on the receiver line side is lost.
R_LOF The out-of-frame fault occurs on the receiver line side.
MS_AIS Multiplex section alarm indication
AU_AIS AU alarm indication
AU_LOP AU pointer loss

Procedure

  1. If the LOS/LOF alarm is reported, a fiber cut, too much attenuation, received overload or faulty board might exist.
    1. If the received optical power is overloaded, add an attenuator.
    2. heck whether the optical fiber cables are intact and whether the connectors are clean and well connected. Replace the fibers or clean the fiber connectors, if necessary.
    3. If the board is faulty, replace the board.
  2. If the MS_AIS alarm is reported:
    1. Check whether the line board at the opposite station is configured with insertion of the MS_AIS alarm. If yes, cancel the configuration.
    2. Check whether the transmit unit of the line board on the opposite station is faulty. Check whether the line board reports the MS_AIS alarm by performing self-loop on the fibers.
    3. Check the line board of the local station. Reset or replace the board. Then, check whether the MS_AIS alarm is cleared.
  3. If the AU_AIS alarm is reported:
    1. For the AU_AIS alarm caused by MS_AIS, R_LOS, and R_LOF, analyze the MS_AIS, R_LOS, and R_LOF alarms to locate the faults.
    2. Another cause might be that the receiving and transmitting of the VC4 path services mismatch. And this causes that AU-AIS occurs on the VC4 paths. In this case, TU_AIS occurs on the corresponding TU channels. Check the station on which the AU_AIS alarm is reported and the stations that communicate services with the AU_AIS station. Check whether the service timeslots at the intermediate service pass-through station are correctly configured. If not, modify the incorrect configuration and issue it again.
    3. Check whether the transmit unit of the line board on the opposite station is faulty. Check whether the line board reports the MS_AIS alarm by performing self-loop on the fibers. If the line board is faulty, reset or replace the board. Then, check whether the MS_AIS alarm is cleared.
    4. If the line unit of the local station is faulty, replace the CXL board at the local station.
  4. If the AU_LOP alarm is reported:
    1. Check whether the service configuration is correct at the local and opposite stations. If not, configure them to correct.
    2. Check whether the transmit unit of the line board on the opposite station is faulty. Check whether the line board reports the AS_AIS alarm by performing self-loop on the fibers. If the line board is faulty, reset or replace the board. Then, check whether the AU_AIS alarm is cleared.
    3. If the line unit of the local station is faulty, replace the CXL board at the local station.
  5. Refer to VC3BBE.

Reference

None.

Translation
Download
Updated: 2019-01-21

Document ID: EDOC1100020975

Views: 74993

Downloads: 136

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