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OSN 500 550 580 V100R008C50 Alarms and Performance Events Reference 02

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The DDN_RFA is a remote frame alignment alarm of the framed E1 services on the DDN side of a board. When the RDI bit is set to 1 for the E1 signals received on the DDN side of a board from the opposite end, the DDN_RFA alarm is reported.


Alarm Severity Alarm Type


Communication alarm



Impact on the System

When the DDN_RFA alarm occurs, the services at the local station are not affected. This alarm just shows that the DDN_LFA alarm is received at the opposite end.

Possible Causes

The possible cause of the DDN_RFA alarm is as follows:

The DDN_LFA alarm is received at the opposite end.


  1. After you clear the DDN_LFA alarm received at the opposite end, the DDN_RFA alarm is automatically cleared.

Related Information


Updated: 2019-01-21

Document ID: EDOC1100020975

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