Description: This attribute indicates whether a LOS (Loss of Signal) alarm state has been entered. A LOS alarm is declared after LOS defects have been observed and accumulated for a period of 2 seconds +/- 0.5 second . A LOS defect is detected upon observing all zeros for 150 ms . If the LOS defects are intermittently occurring, the LOS 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 port goes into an operational state of disabled until the LOS alarm state is cleared. The LOS alarm state is cleared when LOS defects are absent for 10 seconds +/- 0.5 second.