AT&T RELEASE 2 - Manual (Page 69)

TYPICAL SYSTEM WIRING Figure 47 shows a typical wiring installation for a MERLIN Plus system.
INSTALLATION Local telephone lines connect with system wiring at a network interface.
Voice terminal wiring connects to the control unit through building wiring
and a jack field.
FIGURE 47 Typical MERLIN Plus system wiring installation.
Appendix D: Wiring Reference Tables 67