This attribute indicates whether a Loss Of Signal (LOS) alarm state has been entered. An LOS alarm state is entered when LOS defects have been observed and accumulated for a period of 2.5 seconds +/- 0.5 seconds, or if an LOS defect is present when the criteria for LOF failure declaration have been met. A LOS defect is declared when 20+/-3 us of all-zeros pattern is detected. The LOS defect is cleared when two valid framing words are detected and no Loss Of Signal condition is detected during an interval of 20+/-3 us. 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 Sonet/Sdh component goes into an operational state of disabled until the LOS alarm condition is cleared. The LOS alarm state is cleared after LOS defects have been absent for a period of 10 seconds +/- 0.5 seconds. The losAlarm attribute is always set to off when the component has been locked and left offline.