AT&T MERLIN LEGEND System Reference Manual page 32

System Overview
1.
Control Unit. The backbone of the system, consisting of the basic and
expansion carriers, power supply module, processor module, and line/trunk
and Station modules. The control unit connects telephone company
lines/trunks with stations such as telephones and adjuncts,
2.
Line/Trunk and Station Modules. The components that connect telephone
company lines/trunks and terrninal equipment such as telephones, external
alerts, and fax machines via jacks to the control unit.
Carrier (Basic). The component attached to the backboard used to hold the
3.
modules needed for system operation. The basic carrier houses the
processor module, power supply module, and up to five line/trunk and
station modules. Each expansion carrier houses its own power supply
module and up to six additional line/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.
6. Direct Station Selector (DSS). A console that adds 50 buttons for one-touch
extension dialing to the MLX-20L™ or MLX-28D™ telephone and speeds call
handling.
7. Analog Data Station. 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).
8. Magic on Hold®. Optional equipment that connects to the system through a
ground-start/loop-start (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).
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. MLC5 Cordless Telephone. A cordless multiline telephone that connects to
the control unit via an analog station jack.
12. lndustry-Standard Single-Line Telephone. A touch-tone or rotaty industry-
standard telephone connected to the system via 012 basic telephone
module or a 008 OPT module.
An adapter used to connect a variety of
Components 1-5