This attribute displays whether a Loss Of Pointer (LOP) alarm state
has been entered. An LOP alarm state is entered when LOP defects
have been observed and accumulated for a period of 2.5 seconds +/-
0.5 seconds. An LOP defect occurs when no valid SPE or VC
pointer was received in 8 contiguous frames. If the LOP defects are
intermittently occurring, the LOP 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 LOP alarm condition is cleared. The condition is cleared when
no more invalid pointer has been reported for 10 seconds +/- 0.5
seconds.
The lopAlarm 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.