The Major Alarm Inquiry Test determines if the received average DS1 bit error rate on the DS1 facility is greater than 1/1000. All trunks on the DS1 board are put in the out-of-service state if a Major Alarm lasts for more than 20 minutes.
When the Major Alarm is cleared, all trunks on the DS1 board are restored to their previous service state before the Major Alarm occurred.
This test is run on the following maintenance objects:
