On the OSN 6800, no alarm but R_LOS is reported by the NS2 board. If you suppress the R_LOS alarm on the NS2 board on the NMS, is the running indicator on the board in red or green? Is the indicator on the SCC board in red or green? Is the indicator on the top of the cabinet in red or green?
In general, when you suppress an alarm on a device, the device (including relevant boards) does not monitor the alarm any more. Neither the NMS nor the NE reports the alarm. However, the states of the indicators of different devices are different.
In the case of the OptiX OSN 6800, the alm-set-monevent command is used to suppress an alarm. In this case, indicators on both of the SCC and other boards are in green. The indicator on the top of the cabinet indicates whether an alarm occurs on the SCC board. Thus, the indicator on the top of the cabinet is always green.
In the case of the NG-SDH device, if you suppress an alarm such as R_LOS on a certain board, the SRV indicator on the board is still in red, because in reality the alarm exists on the equipment.
In the case of the 2500+, after you suppress an alarm, the indicator is still in green even the alarm occurs on the device.