The Yellow Alarm Inquiry Test determines whether the remote DS1 endpoint is transmitting a Yellow alarm. A Yellow Alarm indicates that the remote DS1 endpoint has an out-of-frame condition.
Once the Yellow alarm is confirmed, all trunks on the DS1 board are put into the out-of-service state. The Inquiry test will be run every 10 minutes until the Yellow Alarm is cleared. When the Yellow Alarm is cleared, all trunks on the DS1 board are restored back to their previous service state before the Yellow Alarm was raised.
The Yellow Alarm corresponds to the yellow F2 state documented in CCITT recommendation I.431.
This test is run on the following maintenance objects:
