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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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Performance Event Meaning

The RSSES event indicates the severely errored seconds of the RS.

Performance Event Attributes

Performance Event ID Performance Event Type


SDH performance event

Impact on the System

If bit errors occur in the services, identify the causes and rectify the fault immediately. Otherwise, alarms will be generated and the signal transmission quality will be affected. If bit errors exceed the B1 bit error threshold-crossing threshold and degrade threshold, the B1_EXC and B1_SD alarms will be generated.

Possible Causes

The RSSES event occurs when one of the following requirements is met: 1. Not less than 30% bit errors are detected in one second. 2. At least one severely disturbed period (SDP) occurs. SDP occurs when the BER of all the continuous blocks in a period of at least four consecutive blocks or 1 ms (select the shorter period) is lower than 10-2, or when the LOF alarm occurs.

External causes:

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

  • The fiber connector is dirty or incorrect.

  • The equipment is poorly grounded.

  • There is a severe interference source around the equipment.

  • The working temperature is high or low, and the opposite equipment cannot tolerate such temperature.

Equipment problems:

  • The signal attenuation on the receive side of the line board is excessive, the transmit circuit at the opposite end is faulty, or the receive circuit at 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


B1 bit errors crossing the threshold


Signals degraded (B1)


The out-of-frame fault occurs on the receiver line side.


  1. See RSES.



Updated: 2019-01-21

Document ID: EDOC1100020975

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