Hardware Components; Control Unit - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Hardware Components

This chapter describes the basic hardware required for the communications
system. It includes the control unit, digital or MLX telephones, analog multiline
telephones, single-line telephones, system operator consoles, adapters and
adjuncts for system telephones, and power-related accessories.

Control Unit

The control
adjuncts such as answering machines and fax machines. The control unit
includes the following components:
Carriers
Processor module (one per system)
Power supply module (one per carrier)
Line/trunk and station modules
Covers
Carriers
The basic and expansion carriers each have seven slots to hold modules (see
Figure 2-1 ). The basic carrier contains a power supply, the processor (slot 00),
and line/trunk and station modules (slots 01-05).
Up to two expansion carriers can be added to the right side of the basic carrier
to increase the capacity of the system. Like the basic carrier, the leftmost and
widest slot of the expansion carrier holds the power supply; the remaining six
slots hold the line/trunk and station modules.
unit connects telephone company lines
with telephones and
Control Unit 2-1