AT&T System 75 Wiring Diagram page 274

CHAPTER 5. AUXILIARY EQUIPMENT INSTALLATION
CHAPTER 5. AUXILIARY EQUIPMENT
Auxiliary Equipment Description
The following optional equipment is available for use with the system.
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:
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.
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.
INSTALLATION
5-1