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MERLIN LEGEND Communications System Release 6.0
System Manager’s Guide
555-660-118
Issue 1
February 1998
System Components
Page 3-2Control Unit
3
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.
Inside the back of each carrier is a component called the
backplane
, which holds
the circuitry that makes it possible for the modules to “talk” to each other and for
the processor module to handle the traffic among the modules.
Every system has a
basic carrier
that holds the following modules in its slots:
■ Power supply module (not numbered)
■ Processor module (slot 00)
■ Up to five line/trunk and extension modules (slots 01–05)
If you need more trunks and/or extensions than can fit in the basic carrier, you can
connect up to two
expansion carriers
to the basic carrier. Like the basic carrier,
each expansion carrier’s leftmost slot holds a power supply module; the remaining
six slots hold line/trunk and extension modules. (The processor module in the
basic carrier serves the expansion carriers too.) The six slots for line/trunk and
extension modules in the expansion carriers are numbered as follows:
■ First expansion carrier (slots 06−11)
■ Second expansion carrier: slots (12−17)
Processor Module 3
The processor module is the “brains” of the system, a miniature computer that
controls system features and diagnostics, as well as the traffic among the
modules (see Figure 3–1
). The processor module provides three jacks, one for
Station Message Detail Recording (labeled
SMDR
), one for system programming
and maintenance using a PC (labeled
ADMIN
), and one for software maintenance
by Lucent Technologies technicians only (this one is plugged shut)
.
The Personal Computer Memory Card International Association (PCMCIA)
interface slot on the processor module is where you insert a PCMCIA memory
card. A memory card is very similar to a floppy diskette used in a PC, but it is
about the size of a credit card. There are different types of memory cards used
with the system, each with a different label (see the next section for more
information).
The processor module has a single-character display for numbers and symbols
that help Lucent Technologies technicians to understand any problems with the
system software and to maintain the system. The module also has a red light that
indicates hardware failures.