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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Performance Event Meaning

The VC3UAS performance event indicates the VC3 unavailable seconds.

Performance Event Attributes

Performance Event ID Performance Event Type


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

VC3UAS indicates the period of time that the unavailable time (UAT) state lasts.

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


  1. Refer to VC3ES.



Updated: 2019-01-21

Document ID: EDOC1100020975

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