AT&T System 75 Wiring Diagram page 224

The maximum cabling distance for an attendant console powered from
the switch cabinet is 350 feet when using 24-gauge wire.
Installation
Install attendant console as follows:
1.
Unpack console and inspect for damage.
Determine port assignment of console from Attendant Console
2.
Form (see Note).
EXAMPLE: Port Number
Note: It is recommended that the primary attendant console
be connected to the control carrier. This allows for battery
holdover on System 75 and a better chance of uninterrupted
service on System 75 XE if a port carrier fails.
3. If power is to be supplied from the switch cabinet (not available on
System 75 XE), do step 4 and omit step 5; otherwise, go to step 5.
4.
Connect jumpers (-48V and GND)from terminal/connecting block in
yellow trunk/auxiliary Field to attendant console appearance on the
station side of the distribution field (Figure 4-16).
If power is to be supplied at cross-connect field, connect power
5.
adapter cord to attendant console appearance on the station side
and a power unit located above the cross-connect field. If power is
not supplied at cross-connect field, provide power as described in
Adjunct Powering section in this chapter.
6. Install patch cord/jumper wires at cross-connect field.
7.
Connect console line jack on bottom of console to information
outlet (Figure 4-15).
Install labels per Attendant Console Form and Display Module Form
8.
Assignments.
9. Install handset bracket on left or right side of console, as desired.
Miscellaneous Wiring Installation
A 02
Carrier Slot Circuit
01
4-27