AT&T System 75, Wiring Diagram

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CHAPTER 5. AUXILIARY EQUIPMENT INSTALLATION
CHAPTER 5. AUXILIARY EQUIPMENT
INSTALLATION
Auxiliary Equipment Description
The following optional equipment is available for use with the system.
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278A adapter—provides an interface to customer-provided
equipment for the Loudspeaker Paging feature. The 278A adapter
requires -24 volt dc power, however it can be modified for -48 volt
dc power by adding a D-181321 kit of parts (Comcode 103 031
181).
89A control unit—provides an interface to customer-provided
equipment for the Loudspeaker Paging feature. A 2012D
transformer is required to provide -48 volt dc power to the control
unit.
PagePac paging system—provides an amplifier system for the
Loudspeaker Paging feature. Three models are available:
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PagePac 20—Provides a single zone of paging with an input
source for music. The unit can be modified to provide 9 or 39
paging zones.
PagePac VS—Provides one to three paging zones. It also
permits all zone paging. Two optional feature cards are
available to provide music or talk-back over paging.
PagePac 50/100/200—Provides 1 to 24 paging zones.
Optional add-ons are available to provide music or talk-back
over paging. Also, it is possible to use a customer-supplied
music source.
All PagePac models require 117-volt ac power.
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36A voice coupler—provides an interface and also protects the
customer-provided equipment required for Intercept
Treatment—Recorded Announcement, Music-on-Hold, and
Recorded Telephone Dictation Access features. The 36A voice
coupler is powered by a 2012D transformer. The 36A voice
coupler is arranged for wall-mounting.
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