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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Install and Wire Telephones and Other Equipment
Page 5-451145B Power Supply
5
1145B Power Supply
The 1145B closet power arrangement provides an uninterruptible -48 VDC power
source with battery and 1145B distribution unit for ISDN/DCP, terminal
equipment, adjuncts, and other customer-supplied equipment. During AC power
interruptions, batteries automatically provide power to the load.
A manual switch on the distribution unit allows the user to redirect reserve power
to outputs 1 through 32 so all outputs are provided battery reserve power.
NOTE:
The switch must be set to the 1-32 position.
The 1145B/1146B is a -48V power supply with 200 Watts total output. Each
output circuit is current limited by a thermistor that limits the maximum output to
12 Watts. Each 1145B output has an LED to indicate the status of the thermistor.
If the LED is on, the thermistor has a short on that power pair.
Not all outputs can simultaneously provide 12 Watts. The average power per
output cannot exceed 6.25 Watts (200/32 = 6.25). The 1145B is designed to
power one ISDN terminal or DCP adjunct per output. The maximum number of
terminals or adjuncts is 32. The 1145B is required for installations outside the
United States.
Auxiliary power (local or bulk) is always required for the following:
■ Attendant Console 302C
■ Any 8520 terminal
■ Any 7500- or 8500-series terminal with an asynchronous data module
■ Any 7500-series terminal whether in passive bus, or point to point (1 per
BRI port)
■ Any 8510 terminal in passive bus or with an asynchronous data module
(unless the 8510 will not be used to support data or video)
■ PassageWay adapter interface
■ Any 8400-series terminal
■ Any 7400-series terminal
Figure 5-20
shows how the standard power supply and wall-mounting plates fit
together. Figure 5-21
shows the expanded power supply components (power
distribution unit and “T” cable).