This attribute displays whether a Line Alarm Indication Signal (L-
AIS) alarm state has been entered. An L-AIS alarm state is entered
when L-AIS defects have been observed and accumulated for a
period of 2.5 seconds +/- 0.5 seconds. The L-AIS defect is the
occurrence of the L-AIS signal in five contiguous STS (STM)
frames (111 pattern in bits 6,7, and 8 of the K2 bytes). If the L-AIS
defects are intermittently occurring, the L-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 Sonet/Sdh component goes into an operational state of disabled
until the L-AIS alarm condition is cleared. The condition is cleared
after not detecting the L-AIS signal for a period of 10 seconds +/-
0.5 seconds.
The rxAisAlarm attribute is always set to off when the component
has been locked and left offline.