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Auxiliary power supplies
555-233-116
40 Issue 4 October 2002
Replacing the batteries
To maintain back-up protection and battery reliability, replace batteries every four
years.
Storing the batteries in inactive units
To prevent leakage when the power unit is not in use for several months or more,
remove the batteries and store them separately.
Repairing short circuits and resetting red LEDs
A red LED next to any of the 32 power output connectors indicates a short circuit
in the building wiring or the terminal equipment. To reset the LED:
1. Disconnect the terminal equipment from the wall jack.
2. If the LED goes off, the terminal equipment is faulty. Replace it.
3. If the LED is still lit, find and repair the short circuit in the building wiring.
4. Reconnect the terminal equipment to the wall jack, and re-test.
1151A and 1151A2 power supplies
The 1151A is a standard (no battery backup) power supply unit. The 1151A2 is a
battery backup version of the 1151A. Either power supply can support one
telephone with or without an adjunct.
The 1151A and 1151A2 power supplies can supply local power to ISDN-T 7400-,
7500-, 8400-, and 8500-series voice terminals connected to a system, and to the
DCP 7444 voice terminal or 302C attendant console that need auxiliary power for
its display. The unit can supply power to adjunct equipment such as S201A and
CS201A speakerphones, or a 500A headset adapter attached to any currently
manufactured analog, DCP, or ISDN-T voice terminal equipped with an adjunct
jack.
The power supply has the following specifications:
■ A single output of -48 VDC, 0.4 A.
■ Either a 120 VAC 60-Hz power source (105 to 129 VAC) or a 220/230/240
VAC 50-Hz power source (198 to 274 VAC).
■ Automatic input voltage selection.
■ Output capacity of19.2 W.
■ Maximum loop range of 250 ft. (77 m).
■ Use of 2 modular jacks. PHONE jack pins 7 and 8 (- and +, respectively)
provide power.