Auxiliary power supplies
555-233-116
32 Issue 4 October 2002
!DANGER:
Do not block or cover the ventilation openings in the c ase.
Do not let anything rest on the unit.
Do not attempt to recharge batteries. The power unit recharges the batteries
itself. Any other recharging method may cause leaks of corro sive electrolyte
or explosion. Discard discharged batteries as soon as possible. Discharged
batteries are more likely to leak.
Do not store batteries in high temperature areas. Bat teries stored in a cold
environment should be protected from condensatio n during storage and
warming. Batteries should be stabilized at room temperature prior to use
after cold storage. Do not install batteries if the manu facturing date on the
label indicates that the batteries are more than six mo nths old.
1145B power supply
The 1145B power supply powers ISDN/DCP, terminal equipment, adjuncts, and
other customer-supplied external equipment. It sup plies -48V, 200 W total and
supports 32 outputs. You can install one ISDN terminal or DCP adjun ct per output.
A manual switch on the distribution unit lets the us er redirect reserve power to
outputs 1 to 32 so that all outputs get battery reserve power.
An optional 1149 battery and 1146 distribution unit provides uninterruptible -48
VDC power.
!DANGER:
When operating power-supply equipment, you must foll ow basic safety
precautions to reduce the risk of fire, electric shoc k and personal injury.
Read, understand, and follow all warnings and instruction s. See ‘‘Required
safety precautions’’ on page 31.

Circuit protection

A thermistor current-limits the maximum output of ea ch output to 12 W, but the
average power per output cannot exceed 7.25 W (200/32 = 7 .25). An LED
indicates the status of the thermistor. When the LED is ON, there is a short on the
power pair.