AT&T RELEASE 2 - Manual (Page 25)

VOICE TERMINAL WIRING When you planned your system, you recorded the intercom numbers for
PROCEDURE specific locations within your business on the System Configuration Form.
Check and make a note of these assignments now, before you begin
connecting the voice terminals to the control unit. When you are ready,
install the voice terminal wiring as follows:
1 Use your System Configuration Form as a reference for each intercom
number.
2 Mark or label a D8W cord on one end with "10."
3 Plug the unlabeled end into the control unit jack that is labeled "10."
4 Plug the other end into the corresponding jack in the jack field.
5 Repeat steps 2 through 4 for the remaining intercom numbers, 11, 12, and
so forth, until all voice terminal wiring is connected.
NOTE: For short and temporary connections, you can connect the
voice terminals directly to the control unit. However, the jack field
connection is the recommended method. See Figure 16.
FIGURE 16 Connecting voice terminal wiring through a jack field.
Step 2: Wiring the Voice Terminals 21