This attribute displays 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 seconds (for 3pDS1Atm, 3pE1Atm, 8pDS1Atm, and 8pE1Atm cards: 2.5 seconds +/- 0.5 seconds). A LOS defect is detected upon observing all zeros for 150 ms (for 3pDS1Atm, 3pE1Atm, 8pDS1Atm, and 8pE1Atm cards: upon observing 175 +/- 75 pulse positions with no pulses of either positive or negative polarity). 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. Also, an RAI alarm is transmitted to the far end for the duration of the LOS alarm state. The LOS alarm state is cleared when LOS defects are absent for 10 seconds +/- 0.5 seconds.