System Components
Page 3-1Control Unit
3
MERLIN LEGEND Communications System Release 6.1
System Manager’s Guide
555-661-118
Issue 1
August 1998
3
System Components 3
This chapter describes the system’s basic hardware. It includes descriptions of
the control unit, MLX telephones, analog multiline telephones, single-line
telephones, system operator consoles, adjuncts and adapters for the system and
telephones, and power-related accessories.
Control Unit 3
The control unit connects the telephone company’s outside trunks to the system’s
telephones and adjuncts. It is the heart of the system, managing the traffic within
the system (inside calls) and making telephone company facilities and outside
services available to your company. It includes the following components:
■ Carriers (up to three)
■ Processor module (one per system)
■ Power supply module (one per carrier)
■ Line/trunk and extension modules (up to 17 total in three carriers)
■ Cover that protects the unit
Carriers 3
The carriers in the system are the containers that hold the modules on which the
circuit boards and connections for lines/trunks and extensions (called
jacks
or
ports
) are located. There can be up to three carriers: one
basic carrier
and two
expansion carriers.
The carriers hold the modules in slots. For the purposes of system programming
and installation, 2-digit numbers indicate the slots, starting with 00 for the
processor module.
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