AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 20

Preparation
1 . Control Unit.
The backbone of the system, consisting of the basic and
expansion carriers, power supply module, processor module, and trunk and
station modules. The control unit connects telephone company trunks with
stations such as telephones and adjuncts.
Trunk and Station Modules. The components that connect telephone
2 .
company trunks and terminal equipment such as telephones, external alerts,
and fax machines via jacks to the control unit.
3 . Basic Carrier. The component attached to the backboard used to hold the
modules needed for system operation. The basic carrier houses the
processor module, power supply module, and up to five trunk and station
modules. Each expansion carrier houses its own power supply module and
up to six additional trunk and/or station modules. One or two expansion
carriers can be added.
4 . Processor Module. A miniature computer that controls most of the system's
features and supplies the system's diagnostics. The processor module
provides two jacks, one for Station Message Detail Recording (SMDR) and
the other for system programming and maintenance via a personal computer
(PC).
5 . Power Supply Module. The component that supplies DC power for the
modules and telephones (one power supply unit is needed per carrier). If the
system's power requirements exceed the capacity of the power supply
module, an auxiliary power supply unit can be added.
Direct Station Selector (DSS). A console that adds 50 buttons for one-touch
6 .
extension dialing to the MIX-20L™ or MLX-28D™ telephone and speeds call
handling.
7 . Analog Data Terminal. A data terminal such as a PC, printer, or optical
reader that connects via a modem (for transmitting and receiving analog
signals) to a 012 basic telephone module or a 008 OPT module. A data
terminal can also be connected to an MLX telephone using a Multi-Function
Module (MFM) or to an analog multiline telephone using a General Purpose
Adapter (GPA.)
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8 . Magic on Hold . Optional equipment that connects to the system through a
GS/LS jack programmed for Music-on-Hold. (A customer-provided music
source can be connected instead of Magic on Hold.)
9 . General Purpose Adapter (GPA). An adapter used to connect a variety of
tip/ring (T/R) adjuncts to an analog multiline telephone (shown here with an
answering machine).
10. Analog Multiline Telephone. A 34-button telephone with built-in
speakerphone that connects to the system via an analog station jack. Other
analog multiline telephones compatible with the system include the 22- and
34-button with built-in speakerphone and a one-line, 16-character display
and the 10- and 22-button with built-in speakerphone, without display.
11. MLC-5 Cordless Telephone. A cordless multiline telephone that connects to
the control unit via an analog station jack.
12. Industry-Standard Single-Line Telephone. A touch-tone or rotary industry-
standard telephone connected to the system via a 012 basic telephone
module or a 008 OPT module.
System Components 1-3