AT&T 75 Wiring Manual page 546

66-TYPE HARDWARE
13.
Connect 2-pair line cord (modular plug at one end) from information outlet to
loudspeaker system (see Figure 4-77).
14.
Install loudspeaker equipment per manufacturer's instructions.
Administer per AT&T System 75 and System 75 XE Implementation and A T & T
15.
System 75 and System 75 XE Administration.
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