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Figure 2-1. Line and Extension Numbering at the Equipment Controller
Connection of Telephones and Devices
You can connect the following telephones and devices to the equipment
controller:
■
■
MLS- and MLC-Model Phones.
MLS- and MLC-model phones require at
least two-pair wiring and are compatible with AT&T four-pair SYSTIMAX™
wiring. If you need a shorter cord for wall mounting, use AT&T’s two-foot
D4BU-29 mounting cord (available separately—see page C-12). An
MLS-34D phone connected to extension jack 10 or 11 is used for System
Programming. Use an MLS-12D phone for System Programming only if
there are no MLS-34D phones installed at your business site.
Industry-Standard Devices.
Industry-standard equipment (including
standard phones) require one-pair mounting cords; AT&T D2R mounting
cords are recommended.
■
Standard Phones.
Connect standard touch-tone or rotary phones to
the equipment controller for:
—
Power Failure Operation.
During a power failure, MLS and
MLC-model phones will not work because they require power to
operate. However, if standard phones are connected to extension
jacks 10, 16, 22, or 28, they can place and answer calls on lines at
line jacks 01, 07, 13, or 19, respectively. Connect a standard
phone to one or more of these extensions, either alone or
combined with an MLS- or MLC-model phone. (If you combine a
standard phone and an MLS- or MLC-model phone on one
extension, you may want to turn off the standard phone’s ringer
during normal use.)
2-4
Installing the Equipment