No actual service runs on a tributary board of the OSN 3500 equipment, but the channels configured with service often report T_ALOS and other invalid alarms so that the alarm indicator light is on. The customer sometime hopes to eliminate the display of the alarm indicator light.
It is verified that:
1. For the NG-SDH equipment in versions earlier than V1R7, the alarm indicator light on a board is off only after alarms are cleared and is still on even if the alarms are suppressed.
2. For the NG-SDH equipment in V1R7 or later versions, the alarm indicator light on a board is off after alarms are suppressed.
If you hope to turn off an alarm indicator light during maintenance, refer to this case.