Siemens HiPath 3000 Operating Instruction page 153

Step by Step
Monitoring LED
The monitoring LED visually indicates the following
PNG operating states:
Monitoring Off:
Monitoring On:
Prealarm Active:
Alarm:
Technical Warning:
Automatic Alarm Off:
continuously off
flashing, 50 ms on/
1000 ms off
flashing, 500 ms on/
500 ms off
continuously on
continuously on
flashing, 500 ms on/
2000 ms off
153