Functional Description - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Introduction
22. AC Power Outlet. A dedicated 115-VAC wall outlet (not controlled by an
on/off switch) that supplies power to the control unit.

Functional Description

This section describes the functional units that make up the control unit, their
relationships, and how signals are processed.
The control unit contains the following functional units:
Processor module
Power supply module
Carrier
Line/trunk and station modules
Functional Units
The functional units are the processor module, which controls the operation of
the system and its features; the power supply module, which supplies power to
the control unit; the carrier with its backplane assembly, which contains the
input/output (I/0) bus and the time-division multiplex (TDM) bus; and the
line/trunk and station modules, which connect the outside lines/trunks to the
stations. All the modules are electrically connected to the backplane, which
provides common circuitry for the I/O bus, the TDM bus, and power distribution,
The processor is connected to intelligent ports on the line/trunk and station
modules, through the I/0 bus, by the digital switch element (DSE) on each
line/trunk and station module. The TDM bus is also connected to the DSE of
each line/trunk and station module. The two buses are illustrated in Figure 1-2.
Functional Description 1-9