This attribute displays whether a Loss Of Frame (LOF) alarm state
has been entered. An LOF alarm state is entered when LOF defects
have been observed and accumulated for a period of 2.5 seconds +/-
0.5 seconds, except when an LOS defect or failure is present. An
LOF defect is detected when getting contiguous errored frame
alignment for at least 3 msec. If the LOF defects are intermittently
occurring, the LOF 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 LOF alarm condition is cleared. The condition is cleared
when framing has been achieved for a period of 10 seconds +/- 0.5
seconds.
The lofAlarm attribute is always set to off when the component has
been locked and left offline.