Processor Module - AT&T MERLIN LEGEND System Reference Manual

Hardware

Processor Module

5-4 Control Unit
When single-line telephones are connected to a 012, 800 DID, or 008 OPT
module, a 129B Frequency Generator (ring generator) must be installed in the
power supply module of each carrier that houses one or more of these modules.
A green LED on the power supply module remains on as long as the module is
receiving power. The power supply module also has an on/off switch and a
modular telephone jack for connecting an auxiliary power unit as needed (see
Figure 5-3).
Figure 5-3 Power Supply Module
Placed in slot 00 of the basic carrier, the processor module controls system
features and programming via the processor and memory boards and the
feature module. The processor module comes in small and large versions. The
small system supports up to 24 outside lines/trunks and 56 stations/station
endpoints; the large system supports up to 80 outside lines/trunks and 144
stations or 255 station endpoints.
The main board contains the 68000 microprocessor, a built-in 1200
bits-per-second (bps) data modem, built-in diagnostics, RAM, a real-time clock,
and interrupt circuitry, and interfaces to the other modules through the I/O bus
on the carrier backplane.
The processor module has two modular RS-232 jacks: one for Station Message
Detail Recording (SMDR) and the other for system programming and
maintenance via a PC (see Figure 5-4).