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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The T_FIFO_E alarm indicates that the transmit FIFO on the PDH side of the E3/T3 tributary board overflows.


Alarm Severity Alarm Type


Equipment alarm



Impact on the System

The alarmed port has bit errors and the services at the port are unavailable.

Possible Causes

Possible causes of this alarm are as follows:

  • Incorrect services are accessed into the E3/T3 tributary board.
  • Service cross-connections are incorrectly configured.
  • The E3/T3 tributary board is faulty.
  • The cross-connect and timing board is faulty.


  1. Check whether correct services are accessed into the E3/T3 tributary board on the NMS.

    If... Then...

    Incorrect services are accessed

    Configure correct services to be accessed into the E3/T3 tributary board. Check whether the alarm is cleared. If the alarm persists, go to the next step.

    Correct services are accessed

    Go to the next step.

  2. Replace the E3/T3 tributary board and ensure that the new board transmits and receives the same types of signals as the old board.

    Replacing the E3/T3 tributary board will interrupt the services on the board. This operation is of risk.

  3. If the alarm persists, replace the cross-connect and timing board.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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