System Components; Control Unit - AT&T MERLIN LEGEND Release 3.1 System Manager's Manual

System Components

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.
NOTE:
This chapter describes hardware that is currently available on the system. The
system also supports hardware that is no longer available for sale or lease. To
find out more about the hardware supported on the system, see the Equipment
and Operations Reference .

Control Unit

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
3
3–1
System Components