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If the ESF FDL is used to transmit a Yellow Alarm, what happens to the ESF FDL messages when a Yellow Alarm is being sent?

April 26, 2017alarm ESF fdl happens Messages sent transmit Used Yellow

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If the ESF FDL is used to transmit a Yellow Alarm, what happens to the ESF FDL messages when a Yellow Alarm is being sent?

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The ESF FDL messages always have priority on the Facility Data Link. If any TR54016 or ANSI T1.403 messages need to be sent, such as the one-second PRM, then the Yellow Alarm (also called Remote Alarm Indication or RAI) pattern is interrupted, the PRM is sent and a Yellow Alarm is again transmitted.