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Infinite
816
Key Telephone
System
GENERAC DESCRIPTION
SECTION
200
GENERAL
DESCRIPTION
200.1
TECHNOLOGY
The Ir$n&s
8 16 Key Telephone
System
is a
microprocessor
controlled,
solid
state
elec-
tronic
switching
system
which
distributes
communications
in a non-blocking
format.
All
control,
switching,
and
interface
circuitry
is
condensed
onto a single printed
circuit
board
(PCB) located inside the IqjWte
8 16 Key Service
Unit. Refer to Figures
200-l
and 200-2.
Switching
is accomplished
through
a solid
state
crosspolnt
matrix
that
provides
voice
path
connections
for eight central
ofhce lines,
sixteen
Key Telephones,
and eight
intercom
paths.
The
central
processor
unit
(CPU) is a 280
microprocessor
that
controls
the crosspoints
and central
office line relays.
It also controls
communications
between
slave rnicroproces-
sors located
fn each I-
8 16 Key Telephone
Refer to Figure
200-3.
The 816 Key &vice
Unit
(KSUI contains
all
system
memory
which
is composed
of 16K of
Read Only Memory
(ROM) and 4K of Random
Access Memory
(RAM). The RAM is subdivided
so that 2K is used as CPU working
area and 2K
is used for customer
database.
The customer
data base memory
is protected
fi-om loss by a
long life lithium
battery.
The system
generic
memory
(ROM) is contained
in a Program
Mod-
ule (PM) that
Is interfaced
to the
816
KSU
through
a modular
connecting
arrangement.
This allows easy access for removal
of system
software
when
upgrading
software
feature
packages.
The system power is regulated
by a switching
power
supply.
This technology
provides
high
efficiency
with
low heat.
A shielded
trans-
former
converts
the 117V ac into logic voltages
on a separate
power
supply
PCB, mounted
within
the KSU cabinet.
Each Key Telephone
contains
a microprocessor
and circuitry
to monitor
button
activity
and
control
lamp
indications.
A built-in
speaker
permits
voice or tone
calling
to the
station
Every telephone
has a Busy Lamp Field (BLII
to monitor
station
activity
in the
system.
Key Telephones
are equipped
with ten function
buttons,
eight
CO line buttons,
and sixteen
Direct
Station
Selection
(DSS) buttons,
which
also store
Station
Speed
Dial
numbers.
A
three-position
rocker
switch
is provided
for
easy selectfon
of intercom
signaling
modes.
along
with
separate
tone
ringing
and
voice
volume
controls.
For emergency
applicattons.
astand-alone
bat-
tery backup
(BBUI assembly
may be connected
to the battery
output
terminals
on the 816
KSU.
7h.is retains
system
power
in the event
of commercial
power fallure.
The system protides
automatic
cut-through
of
central
office (CO) lines to optionally
provided
single line telephones.
These instruments
can
make
and receive
calls during
a commercial
power outage or following
a CPU failure.
209.2
SYSTEM COMPONENTS
The following
components
make up the In#ni&?
8 16 Key Telephone
System:
l
l
l
l
l
l
l
l
l
l
Enhanced
Key Service Unit
Enhanced
Key Telephone
Executive
Key Telephone
Wall Mount
Kit
Program
Module
Phone Box
Real Time Clock Unit (Replacement)
Serial Interface
Unit (Replacement)
Battery
Back Up Unit (BBU)
Single Line Adapter
(SLA)
A
Enhanced
816 Key Service
Unit
(KSU)
The Enhanced
8 16 KSU (Figures
200- 1
and 200-2) is a sealed, self-contained
unit
that has no user-serviceable
parts inside.
All connections
are accomplished
exter-
nally through
Amphenol-type
plugs
and
modular
connections.
A Program
Module
(PM) allows
easy expansion
of software
features.
A Serial Interface
Unit (SIUI and
a Real 'Bme Clock Unit (RCUI are installed
as standard
equipment.
They support
Sta-
tion
Message
Detail
Recording
(SMDR)
and display
phone
capability.
SMDR
al-
lows a customer
to track incoming
and/or
outgoing,
and local and/or
long distance
calls by CO line, number
dialed,
tfme of
Issue
1, January
1992
200-l
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