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.