AT&T 75 Wiring Manual page 407

Installation
1 . Determine port assignment of ADU from Data Module Form:
2 . Install patch cord or jumper wires at cross-connect field.
3 . Connect RS-232 plug on ADU to data terminal.
4 . Run and connect 4-pair line cord (modular plug on both ends) from information
outlet to ADU (see Figure 3-137).
Administer per AT&T System 75 and System 75 XE Implementation and A T & T
5 .
System 75 and System 75 XE Administration.
Figure 3-137. Connections to ADU for Data Terminal Equipment (R1V2 or
R1V3)
EXAMPLE: Port Number
110-TYPE HARDWARE
B 02 01
Carrier Slot Circuit
3-191