SERIES 700
TELETALK
IMPORTANT INSTALLATION INSTRUCTIONS
Before
starting
the
installation,
check
each
unit to
be
sure
it
is
the
correct
one
for
the
power
supply
at
each
location.
The
label
inside
the
cabinet
will
indicate
whether
the
unit
is
117-volt
60-cycle,
230-
volt
60-cycle,
or
117-volt
25-cycle.
Make a
detailed
layout
of
the
complete
system
to
show
exactly
where
each
unit will
be
located
and what
type
of unit
it
will
be.
When
difficulties
arise
which
require
trouble-shooting
any
circuits
inside
the
units,
refer
the
unit
to
authorized
repair
men.
Do not
remove
back
cover
and
attempt
to
make
changes
or
repairs
to
the
equipment.
IDENTIFICATION
OF
MODELS
TELETALK
INTERCOMMUNICATION SYSTEMS
Teletalk
systems
are
made
up of two
or
more
"Sta-
tions"
joined by
interstation
wiring.
These
stations
may
be
either
"Master
Stations"
or
"Speaker
Sta-
tions
,"
depending on
the
type
of
system
employed,
and
the
kinds
of
intercommunication
desired
at
each
particular
point
where
a
station
is
to
be
located.
TELETALK
MASTER STATIONS
A
"Master
station"
consists
of a
cabinet
containing
an
amplifier,
a
speaker-microphone,
and the
neces-
sary
switches
and
controls
for
operation
in
the
par-
ticular
type of
system
employed.
A
Master
Station
requires
an
alternating-current
power
supply.
The
Master
Stations
can
originate
calls
with
other
Master
stations
or
Speaker
Stations.
Master
Station
units
are
used
at
all
points
where
it
is
necessary
to
communicate
with
several
other
stations.
The
number
of
stations
which
can
be
called
varies
from
6
to
48
depending on
the
model
used.
Master
stations
are
designed
for
"s"
circuit
and
"M"
circuit
appli-
cations
.
The
"M"
circuit
is
not
secretive
-
any
Master
unit
can
monitor
a
Speaker
unit
or
another
Master
Station.
Any
Master
can
listen
in
on
conversations
between
any
other
two
units.
However,
the
"-14"
Silencing
circuit
can
be
used
to
prevent
"monitoring."
An
"S"
circuit
is
secretive.
Conversations
between
two
Master
Stations
cannot
be
listened
to
by any
other
station,
nor
can
any
Master
station
"monitor"
any
other
except
when
set
up
for
conference.
Several
variations
of
the
Master
station
unit
are
available
to
meet
special
conditions
and
are
described
in
the
section
"Circuit
Variations
and
Connections.
"
A
"Speaker
station"
consists
of a
cabinet
containing
a
speaker-microphone
only
and
no
amplifier.
It,
therefore,
can
be
used
to
converse
only
with
a
Master
and not with
another
Speaker
station.
Two-
way
conversation
is
possible
from
Speaker
stations
to
the
"M"
circuits
of a
Master
station.
When
2
Speaker
Stations
are
connected
into
the
"S"
circuits
of a
Master
only onll-way
conversation
is
possible
from
Master
to
Speaker.
It
is
possible
to
originate
a
call
to a
Master
from
each
Speaker
equipped with
either
an
annunciator
push
button
or
Call-In
switch.
MASTER STATION CODE SYSTEM FOR
MODEL IDENTIFICATION
The
Teletalk
Key
Number
or
Coding
System
is
de-
signed
to
combine
all
the
necessary
information
on
a
particular
model,
its
variations,
and
equipment
into a
single
Code
Number.
The
"Basic
Model" code
number
gives
only
the
series
Number
and
Capacity
Number
(Number of
Stations).
Table
1
No. added to
Capacity
series
number
06
6-station
12
12-station
24
24-station
48
48-station
Other
letters,
and
numbers
preceded
by a
dash
are
used
in
the
code
number
to
designate
model
varia-
tions
as
indicated.
Table
2
Variation
Number
Variation
A
Annunciator
C
Earphone
LBusy
signal
T
Telephone
handset
-V
230
volts
A.C.
-z
25-cycle
-1
All-call
switch
-3
Three-position
selector
switches
-6
500-ohm
voice
line
-14
Silencing
circuit
-15
Paging
key
-18
All-call
paging
