User Manual

Installation Instructions Fixed Subscriber Unit Installation Manual
09/06/2001 Release 2.0
Airstar-Wireless Local Loop
4-28
4. Connect the Backup Battery Unit to the DC Input
receptacle, also on the back of the FSU.
NOTE : A fully charged backup battery allows the FSU to continue operation if
power fails. The backup battery provides approximately two hours of
talking time and approximately 20 hours of standby time. Recharging may
take up to 30 hours. In the event of a prolonged power failure, remove the
battery to avoid over discharging as this may shorten the battery’s life.
Backup batteries must be replaced every 2 years. The batteries’ capacity
decreases to 60% after 2 years , at approx. 25°C
Figure 4-14 : Backup Battery Unit Connection