This attribute indicates whether a Payload AIS alarm state is
entered. A Payload AIS alarm state is entered when a Payload AIS
defect persists for a period of 2.5 seconds +/- 0.5 seconds. A
Payload AIS defect is declared when the incoming signal of the
6312 kbit/s frame payload (TS1 - TS96) has two or less zeros in a
sequence of 3,072 bits (0.5 ms). If the payload AIS defects are
intermittently occurring, the payload AIS defect accumulator is
decremented at a rate of 1/10 of the incrementing rate (alarm
integration ratio of 1/10), with all measurements based on a 200 ms
polling cycle.
A Payload AIS failure alarm is cleared when the Payload AIS
defect is absent for a period of 10 seconds +/- 0.5 seconds. The port
goes into an operationalState of disabled until the AIS alarm
condition is cleared. While the port is in the Payload AIS alarm
state, the node also transmits the far-end RAI defect indicator on the
out-going JT2 line.