This attribute displays whether an Path Alarm Indication Signal (P-
AIS) alarm state has been entered. An P-AIS alarm state is entered
when P-AIS defects have been observed and accumulated for a
period of 2.5 seconds +/- 0.5 seconds. The P-AIS defect is the
occurrence of the P-AIS signal in three contiguous valid STS or
STM frames (all one's in bytes H1 and H2). If the P-AIS defects are
intermittently occurring, the P-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.
The Path component goes into an operational state of disabled until
the P-AIS alarm condition is cleared. The condition is cleared after
no P-AIS defect has been detected for 10 seconds +/- 0.5 seconds.
The rxAisAlarm attribute is always set to off when the Path
component has been locked and left offline by the operator or when
the Path component has been suspended since the parent component
has been locked.