AT&T Lucent Technologies PARTNER Plus Installation And Use Manual page 12

Control Unit
Telephones
"MLS" stands for "Multi-Line
Set," because an MLS-model
telephone can handle more than
one outside line.
"MLC" stands for "Multi-Line
Cordless."
In order to program the system,
you must install an MLS-12D or
MLS-34D phone at extension 10.
The control unit is the heart of the system. It consists of a backplane, a proces-
sor module, up to four 206 or 200 modules, and a cover.
Backplane. All the system modules slide into the backplane, which chan-
nels power to the system.
Processor Module. The processor module provides the intelligence that
controls most of the system's features. It also has an RCA jack for a music-
on-hold audio source and a jack for a loudspeaker paging system.
206 Module. Each 206 module has jacks to connect a maximum of 2 out-
side telephone lines and 6 extensions. You can connect telephones and
other telecommunications devices (such as fax machines, answering
machines, or modems) to the extension jacks on the 206 module (either
directly or through your building's extension jacks). Each 206 module has a
green power indicator that shows when it is turned on. A system can have up
to four 206 modules, so the maximum capacity of the system is 8 lines and
24 extensions. The system requires at least one 206 module.
200 Module. The 200 module is similar to the 206 module, but without
extension jacks. It only has jacks for two outside lines. This module lets you
add lines inexpensively when you do not need more extensions.
Cover. The cover slides onto the front of the backplane after all modules
have been installed.
Two kinds of telephones work with your system:
AT&T MLS- and MLC-model phones that are designed to make maximum
use of the system's features. In this book these phones are called "system
phones."
Industry-standard (non-proprietary) rotary or touch-tone phones, including
standard feature phones with built-in feature buttons and lights. In this book
these phones are called "standard phones."
AT&T manufactures the following system telephones:
AT&T MLS-34D™ Telephone. This phone is a good choice for extension
10—typically the extension used by the system manager, receptionist, or
operator. It has 34 buttons with lights: 8 buttons for outside lines or pro-
grammable features, 2 intercom buttons, and 24 lighted programmable
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