AT&T 555-230-894 manual Install the 1145B1 Power Supply

Installation

Install queue warning indicator as follows:

1.Determine port assignment for queue warning indicator from Hunt Group Form:

EXAMPLE: Port Number	2	B	02	01
	Cabinet	Carrier	Slot	Circuit

2.Install patch cord/jumper wires at cross-connect field.

3.Mount indicator at specified location.

4.Connect a 2-pair line cord (modular plug at one end) from the information outlet to the indicator. See Figure 9-3.

5.Connect red (R) and green (T) leads to the indicator.

6.Administer per DEFINITY Communications System Generic 3 V2 Implementation, 555-230-655.

Install the 1145B1 Power Supply

The 1145B1 closet power arrangement provides an uninterruptible -48VDC power source with battery and 1145B1 distribution unit for Integrated Services Digital Network (ISDN)/digital communications protocol terminal equipment, terminal adjuncts, and other customer provided equipment. During AC power interruptions, batteries automatically provide continuous power to the load.

During normal operation, the power supply/charger provides DC power to the load via the distribution unit while maintaining the battery in a fully charged condition. A manual switch on the distribution unit allows the user to redirect reserve power to outputs 1 through 8 or 1 through 32, with the switch set to the 1 through 32 setting, all outputs will be provided battery reserve power.

The 1145B1/1146B1 is a -48V power supply with 200 watt total output. This unit is a 110-type distribution unit with 32 output circuits. Each output is current limited by a positive temperature coefficient thermistor (PTC). The thermistor limits the maximum output to 12 watts and prevents excessive current from causing hazards. If the thermistor is current limiting, there is a short across the power pair. Each 1145B1 output has an individual light emitting diode to indicate the status of the thermistor. If the light emitting diode 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 1145B1 is designed to power one integrated services digital network terminal or digital communications protocol adjunct per output. The maximum number of terminals or adjuncts is

9-26Issue 1 September 1995