AT&T DC - Operational LEDs; Alarms; Alarm LEDs and Corresponding Audible Alarms; Audible Alarm

3.2 Operational LEDs
Figure 4: DC UPS Front Panel LEDs
Four status LEDs are displayed on the front panel of the DC UPS. The operation of the DC UPS
can be assessed using these LEDs.
Table 2: LED Indicators
3.3 Alarms
There are audible and visual alarm signals to alert the customer to abnormal and/or service
affecting conditions present in the DC UPS.
3.4 Alarm LEDs and Corresponding Audible Alarms
TYPE Condition
Buzzer
ON Battery
Battery being discharged
Beeps ONCE during switchover to
battery back-up
Low Battery
Reached about 90% discharge Beeps 4 times per minute
Replace Battery
Battery failed self test Beep once every 15 minutes
Missing Battery
No battery installed or battery
disconnected
None
Table 3: Audible Alarm
3.5 Audible Alarm
TYPE Condition
Buzzer
Input Power Fail
Loss of input power
1 second beep at power loss
Replace Battery
Battery failed self test Beep once every 15 minutes
Low Battery
Reached about 90% discharge
Beeps 4 times/minute
Table 4: Audible Alarm Actions
DC UPS Operation Manual, Rev 1.0 Page: 7 of 8