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SECTION 3
HARDWARE SUMMARY
System Overview
The digital telephone system consists of an electronic
Key Service Unit (KSU) base unit, usually referred to
as common equipment, optional expansion modules to
extend station and line capacities as required, a
software cardridge containing the operating
System
programming, dedicated digital electronic key
telephones, and interconnecting wiring consisting of
small, 2-- or 4--conductor, twisted-pair cable.
The station and line capacity of the base unit and
optional expansion module are per the following chart.
MODEL
CO/PBX
STATION
NO.
CAPACITY
CAPACITY
CO408 4
8
CO81 6
8
16
Cl 632
16
32
CM408 4 8
The digital telephone system is full featured, and
supports the digital telephone models.
The digital system is expandable in both line and
station capacity with the addition of add-on expansion
modules. Refer to
Figure 3-14
on page 3-24 for an
illustration of the expansion configurations.
COMMON EQUIPMENT
DESCRlPTlON
The common equipment base unit is a fully electronic
device. It is essentially a special purpose computer
system acting as a communications controller
between central off ice (CO), private branch exchange
(PBX), or
CENTREX
supplied lines and the proprietary
digital telephone stations. The software architecture
of the common equipment provides complete system
support
and
great flexibility of operation.
The system is fully digital and is ISDN up-gradable
with two usable time slots available for each station.
The digital information passes over time division
multiplexing (TDM) highways. The digital information
is an encoded version of the voice transmission and
control signals that are translated into computer
language. The TDM highway can transmit several
signals over a single pair of wires at the same time.
The signals are governed by a system clock. This
clock creates an overall point of reference against
which the TCM information is synchronized and
partitioned into time slots. A time slot is a portion Of
time assigned to a particular position of the system
clock. Each time a particular clock position
iS
reached, the information associated with that position
can be read. As the system clock goes through the
clock cycle, all necessary digital information is passed
between the pieces of equipment sharing the highway.
The common equipment consists of a base unit, which
provides complete feature support, and optional
expansion modules which provide extended station
and line coverage.
The wmmon equipment is contained in a functional,
modem-style metal housing of contemporary design in
keeping with the needs of the modem off ice
environment. It is engineered to be wall or rack
mounted. The outline dimensions of the common
equipment base units are illustrated in
Figure l-l.
STATION DESCRIPTION
The digital telephone stations employed with the
digital system are electronic, microprocessor-
controlled, devices. They allow not only multiline
pickup but also single key access to features available
from the serving CO, PBX, or
CENTREX
switch
as
well as the wmmon equipment. The digital telephone
is available in two different images. The features of
the images are as listed below and as detailed in
Figure
l-2
and in
Figure
l-3.
The wide-image digital telephone provides the
following features:
l
Full modular connection
l
3 fixed buttons with indicators
. SPKR
l HOLD
.
ITCM
3 fixed buttons without indicators
l TAP
.
TRANS/CONF
. MUTE
Programmable buttons with indicators
7-foot, G-conductor line cord
6 position, 4- or 6-conductor modular line jack
K-type handset (hearing aid compatible)
Ringer volume control (Off, Low, and High)
Wall mounting capability