AT&T System 75, Wiring Diagram

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CHAPTER 5. AUXILIARY EQUIPMENT INSTALLATION
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Install the cover on the 278A adapter.
Install patch cord/jumper wires at cross-connect field.
Connect a 2-pair line cord (modular plug at one end) from the
information outlet to the loudspeaker system (Figure 5-2).
Install loudspeaker equipment per the manufacturer’s instructions.
Administer per AT&T System 75 and System 75 XE—lmplementation
( 5 5 5 - 2 0 0 - 6 5 1 ) a n d AT&T System 75 and System 75
XE—Administration (555-200-500).
Installing Loudspeaker Paging Access—89A Control Unit
Requirements
Access to loudspeaker paging is provided by an information outlet. The
switch side of the cross-connect field is connected to a 89A control unit.
The control unit is mounted in the auxiliary cabinet, if one is available. If
an auxiliary cabinet is not available, a connectorized wiring block must
be locally engineered to replace the auxiliary cabinet’s ED-1E443-10
intra-connection panel. Six leads (T, R, SZ, SZ1, S, and S1) connect the
89A control unit to a TN763 Auxiliary Trunk circuit pack located in a port
carrier. A TN763 circuit pack contains four ports.
Figure 5-3 shows the connections for the Loudspeaker Paging feature.
The connections are for one zone. Repeat the connections for each
paging zone.
The connections shown in Figure 5-3 are used when the loudspeaker
interface equipment is not located in the equipment room. If the
loudspeaker amplifier is located in the equipment room, the connections
do not have to be routed through the cross-connect field.
5-8