Bell 4A User manual
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BELL
SYSTEM PRACTICES
AT&TCo
Standard
SECTION 512-700-lOD
Issue
2,
September 1974
4A
SPEAKERPHONE SYSTEM
1. IDENTIFICA
TiON
1.01 The
4A
speakerphone system
is
a hands-free
voice switched system for use as a telephone
adjunct
and
is
a
replacement
for
the
3-type
speakerphone system.
1.02 This section is reissued to add information
on:
• lOSAR loudspeaker
set
• 680AR and 680AR14
transmitters
• 82B connecting block
• Station
busy
lamp circuit
1.03 The
4A
speakerphone
system
consists
of
a
transmitter,
loudspeaker
set,
power
unit,
and either a connecting block
or
adapter
that
when
connected to a suitable telephone set, provides:
o Hands-free telephone operation
• On-hook dialing (when dial
is
not
obstructed)
• Automatic switching from speakerphone to
handset
operation
•Transmitter
muting for private conversation
• Visual indication when system is in use
•
Cutoff
common
ringer
or
other
signaling
devices when desired.
1.04 Components
of
the
4A
speakerphone system
!ire shown in Fig.
2.
1.05 This system may be used with
the
lA,
lAl,
and 1A2 key telephone s '.ems
and
all PBXs.
1.06 For additional schematic ant! circuit information
refer
to
SD-
and CD-69909-01, respectively.
Ordering Guide
1.07 Components which make
up
the
4A
speakerphone
systems
are ordered separately
as
follows:
•Set,
Loudspeaker,
108A-* (includes 7-foot ·
D20N mounting
cord)"
••Set,
Loudspeaker, 108AR-* (includes 7-foot
D20N
mounting
cord)
for
use
when radio
frequency interference is a problem•
•Transmitter,
680A-* (includes 7-foot, DSS
mounting cord)
••Transmitter,
680Al4-* (includes 14-foot,
DSS mounting cord)
•Transmitter,
680AR-* (includes 7-foot, D8S
mounting cord) for use when radio frequency
interference is a problem
• Transmitter, 680AR14-* (includes 14-foot
DSS
mounting cord) for use when radio frequency
interference
is
a problem•
• Unit, Power, 85Bl-49
• Only one required-either Block, Connecting,
82B-49
or
Adapter, 223A-49 (includes 7-foot,
M16C and
25
foot M2FG cords).
Note:
•The
82B (when
it
becomes available)
may
be
substituted
for
the
82A connecting
block.•
•Add color suffix.
1.08 Mounting cords
are
available only in
satin
silver (-
87).
The M2FG cord or
the
223A
adapter
only comes
in
25
foot length.
A 14-foot cord may be ordered for field replacement
for
the loudspeaker
set
or
223A adapter. Example:
Cord, D20N-87,
14
feet
Cord, M16C-87,
14
feet
© American Telephone and Telegraph Company,
1974
Printed
in
U.S.A.
Page
l
SECTION 512-700-100
CONN
CABLE
CONNECTOR
CABLE
~~~~
.......
OPTION
PLUG
8581
POWER
UNIT
82-TYPE
CONNECTING
BLOCK
108-TYPE
LOUDSPEAKER SET
680-TYPE
TRANSMITTER
TELEPHONE
SET
(ROTARY OR"TOUCH-TONe:"
DIAL)
A.
CONNECTIONS
USING
82-TYPE
CONNECTING BLOCK
MOUNTING
CORD
D20N
MTG
CORO
108-TYPE
LOUDSPEAKER SET
NOTE:
680-TYPE
TRANSMITTER
8.
CONNECTIONS USING
2Z3A
ADAPTER
WHEN
Ml6C
CORD
IS
TERMINATED
IN
SET,
DISCONNECT, INSULATE, AND STORE
ALL
SPEAKERPHONE LEADS IN MOUNTING
CORD
AT SET.
Fig.
1-Typical
Arrangements
of
4A
Speakerphone
System
Page
2
0
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)
(_
0
()
()
108-TYPE
LOUDSPEAKER SET
\
8581
82-TYPE
CONNECTING BLOCK
,.-,/'
p
ISS
2,
SECTION 512-700-
H.1:1
(3)
When
speech
is
transmitted,
the
gain
of
the
transmitter
circuit increases to normal.
Simultaneously, the gain of the loudspeaker circuit
lowers
to
avoid
singing
as
a
result
of
the
increased
transmitter
gain. The
amount
of
the
k:'.
gain
change
depends
upon
the
setting
of
the
volume control.
POWER
Ut<IT
71~
Fig.
2-Components
of
4A
Speakerphone System
1.09 The
transmitter
and loudspeaker
set
will be
shipped
in
four promoted colors: Black
(-03),
Green
(-51),
White
(-58),
and
Light
Beige
(-60).
The following kits may be ordered if a color change
is desired.
Each
kit
contains all
necessary
color
,ignificant
parts
to
convert
both
the
loudspeaker
and transmitter.
Kit
of
Ports Color
D-180507 Black
D-180508 Ivory
D-180509 Moss Green
D-180510 Red
D-180511 Yellow
D-180512 White
D-180513 Lt. Beige
D-180514 Lt. Gray
D-180515 Aqua Blue
1.10 4A speakerphone circuitry:
(1)
The
4A
speakerphone
incorporates
a
voice-switching circuit, eliminates singing,
and essentially eliminates far-end
talker
echo.
_q
(2)
When
there
is no
transmission
of
speech,
gain
is
automatically
removed
from
the
transmitter
circuit and added to
the
loudspeaker
circuit. This avoids a
singing
condition while
receiving.
(4)
A circuit, referred to as a switchguard utilizes
the
voltage
in
the
loudspeaker
circuit
to
reduce
the
possibility
that
surrounding
room
noise will cause false operation of
the
switching
circuit while receiving speech.
(5)
A predetermined voice level is necessary to
switch from
the
receiving to
the
transmitting
condition.
In
the presence
of
steady
room noise,
a special circuit automatically raises the required
threshold
level
to
prevent
operation
of
the
switching control circuit by
the
noise. Talkers
will still switch satisfactorily because they increaEe
their levels
under
noisy conditions.
Radio Frequency Interference (RFI)
1.11
•In
areas
where
RFI
is a problem, install a
680AR or 680AR14
transmitter
and a 108AR
loudspeaker set. These components are the same
as
the
680A
and
680A14
transmitter
and
108A
loudspeaker
set
respectively
with
the
exception
that
circuit components
necessary
to reduce
RFI
have been added
.•
680A
•680A
14, 680AR, or 680AR1
~
Transmitter
1.12 The
transmitter
is a small
unit
incorporating
the
microphone,
preamplifier,
an
indicator
lamp, and the operating controls for the speakerphone.
The controls include
the
ON OR QUIET
button,
the
OFF
button,
and
the
volume
control.
The
control
button
and
a
stationary
button
comprise
the
color significant portions
of
the
transmitter.
The ON OR QUIET
button
activates
the
system
and,
if
held depressed,_ilisables
the
microphone
.l?_O
that
the
spea~erohone
user
may conduct a private__
cOnVersation
without
the
party
at
the
far
end
hearing:., The
OFF
button
simply
turns
off
the
system.
The volume
control
varies
the
received
sound level. The indicator lamp lights when
the
system
is
on.
Page
3
SECTION
512-700-100
108A
•or
108AR.
Loudspeaker
Set
1.13 The loudspeaker
set
contains
the
electronic
circuitry,
the
loudspeaker,
and
the
relay
and
transformer
necessary to couple to the telephone
system.
The electronics,
loudspeaker,
and
cord
comprise
the
non-color-significant subassembly, and
a color
significant
plastic
housing
completes
the
set.
Fig.
3-108A
loudspeaker
Set
with
Cover
Removed
82-Type
Connecting
Block
1.14
The
82-type
connecting
block
is
used
to
interconnect
the
4A
speakerphone
system
(680-type
transmitter,
108-type
loudspeaker
set,
and
the
85Bl
power unit}
for
use with plug-ended
6-button key telephone sets. A reversible option
plug provides
the
key
system
options,
ringer
cutoff
or
operation
of
an auxiliary relay.
~
ft:;:"
block includes
tbru
~ip
.;oDHw::to~.
one
for
the
telephone
set,
one
for
the
key
system
connector
cable,
and
one
that
accepts
the
transmitter
and
loudspeaker
set
connectors
with
the
reversible
option plug. The arrow on
the
plug
of
the
D20N
mounting cord should point to the option required
on the option plug. There are seven screw terminals
(82A)
or
eleven
screw
terminals
(82B)
for
AC
power connections and
lAl,
1A2,
or
IA
key system
operation (Fig.
6).
TELEPHONE
SET
MOUNTiNG
CORD
·
..
·.;
..
r..:.::,~.
·.
.
.·.
f,
"'"""'""
.,·::::-~
.......
""
.
';''·
'
,.,......._.
.,
D8S-87
~
MOUNTING
"'<.~
CORD
'\~
Fig.
4--82-Type
Connecting Block
with
Cover
Removed
223A
Adapter
1.16
The
223A
adapter
interconnects
the
4A
speakerphone
system
(680-type transmitter,
the 108-type loudspeaker set, and
the
85Bl
power
unit) when the 82-type connecting block cannot be
used. The
adapter
consists
of
a
M16C
cord (having
a 50-pin
connector
on one
end
and
spade-tipped
leads on
the
other
end),
the
M2FG cord, (for 85Bl
power unit) and the plastic cover and base (Fig.
5).
The M16C spade-tipped leads
are
to be connected
to a connecting block
or
within
the
telephone
set
(Fig.
5).
DBS
MTG
CORD
<--------·----
..........
1.15
tThe
82B is
the
same as
the
82A
connecting'·"-,,,,
block
with
the
exception
that
access
to
• Fig.
5-223A
Adapter
terminals
10
and
35 from
the
speakerphone
plug
\
and
terminals
21
and
46
from
the
telephone
set
)1
and line receptacle
are
made available
by
means
..
of
screw-type terminals (Fig. 6)..
,,/
___.../
......
~---~
Page
4
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8581 Power Unit
1.17
The
power
unit
transforms
the
local
customer-provided 115 volt,
60
Hz power to
the
voltage
level
required
to
operate
the
4A
speakerphone
system.
An
85Bl
power
unit
(UL?/'
approved) can be used tQ._£owe@Iy
o~~
speakerphone-
system.
The
85Bl
power
unit
should be located
less
than
125
feet
from
the
108-type loudspeaker
set
when using
24
gauge
wire.
1.18 A retaining clamp (841050818) will be shipped
with
the
85Bl
power
unit
and
should
be
mounted to the
AC
receptacle to hold power unit
securely and to
prevent
accidental loss
of
power.
2. INSTALLATION
2.01 The
telephone
set
intended
for
use
in 4A
speakerphone system
must
meet the following
requirements:
(1) Provide a
set
of
line switch
transfer
contacts
to
disconnect
the
speakerphone
when
the
handset
is lifted.
(2)
Rotary
dial
sets
dialed
in
an
on-hook condition
must
provide two
sets
of off-normal (make)
contacts
in
the dial for loudspeaker and receiver
muting during dialing.
(3)
TOUCH-TONE®
sets
dialed in
the
on-hook
ISS
2,
SECT'ION
512-700-
l 00
• Shorting
the
receiver input to loudspeaker
set, disabling
the
loudspeaker
through
the
P3 and P4 leads.
2.02 Planning an installation:
(1)
Avoid placing
apparatus
with plastic covers
or parts
in
location where ambient temperatures
may exceed
140
degrees F.
(2)
Plug
the
85Bl
power unit into an
AC
power
outlet
(not
under
control
of
a switch) and
lock
in
place with retaining clamp furnished.
(3)
The 85Bl power unit should be located less
than
125
feet
from 108-type loudspeaker
set
when using
24
gauge
wire.
(4)
Place loudspeaker
set
and
transmitter
within
convenient reach
of
user
and a minimum
of
one foot apart.
(5)
Transmitter
must
be
at
least
two
feet
from
transformer
or any AC powered device.
(6)
There
should
be
no
obstructions
between
the
user, loudspeaker set, and transmitter.
(7)
Make connections
as
shown in appropriate
figures
of
this section
or
other
sections in
Division
512
for specific telephone
set
connections.
/8)
•If
82-type connecting block
is
used, install
condition
must
provide a
set
of
make contacts
(s and t) in
the
dial common switch to connect
line power (IR) from
the
loudspeaker
set
to
the
dial oscillator.
If
a polarity
guard
is provided
these
contacts
(s
and
t)
must
be isolated from
the
oscillator by the polarity guard.
/
audible
signal
cutoff
using
the
"RING
/ CUTOFF"
or
"AUX RELAY" option as needed.
(4)
Certain wiring precautions
must
be observed
when multipling
sets
wired for speakerphone.
The
Tl,
Rl,
IR
or
P4,
IT
or
P3,
LK
and
AG
leads should be disconnected
at
or
as
close
as
possible to
the
set
in those stations
not
having
speakerphone. Even
though
none
of
the
multipled
sets
have speakerphone
the
leads involved should
be disconnected.
Failure
to
do
so will
result
m:
• Tip and
ring
cross
through
the
Tl
and
Rl
leads
•
False
operation
of
an
A relay
through
the
AG lead
/
Use
the
leads
to
common
signal
control
and
' common
or
buzzer circuit for this
cutoff
feature
(Fig.
7).
-
{9)
•For
station
busy
lamp
circuit
with
4A
speakerphone system,
refer
to
the appropriate
Service section in Division 502 for telephone
set
involved
.•
3. OPERATION
Note:
4A
speakerphone
system
permits
normal use of
the
telephone
set
for originating,
receiving,
or
transferring
calls.
3.01 To originate a call using speakerphone:
(1)
Depress
transmitter
ON OR QUIET button
and release.
ON
lamp will light indicating
Page 5
..
r~·.,
/
'
I
SECTION S12-700-100
speakerphone
is
in the talking condition. Listen
for
dial
tone
transmitted
through
loudspeaker
set.
Telephone
handset
is
not
lifted
during
dialing (except where handset covers dial)
[3.01
(3)].
(2)
Operate
dial
of
telephone
set
in
normal
manner.
(3)
When originating calls from telephone
sets
which
require
off-hook dialing, dial in
the
normal manner,
then
depress and hold
the
ON
OR QUIET button until
the
handset
is
restored.
(4)
When
complete
number
is dialed,
ringing
tones,
busy
signals
or
called
party
answer
will be
heard
from
the
loudspeaker set.
(5)
When called
party
answers,
transmitter
and
loudspeaker
set
are
used
to
carry
on
a
hands-free
conversation.
Adjust
volume level
as
desired.
Note:
Best
operational
results
are
obtained
at
the
lowest acceptable volume setting.
3.02
To
answer an incoming call using speakerphone:
(1)
Telephone
set
ringer
signals
an
incoming
call.
(2)
Depress
ON
OR QUIET button on transmitter.
Ringing
is
tripped and system
is
automatically
connected to the line by
the
loudspeaker
::;et.
p;
To
disable
tr~nsmitter
':he~
it
ia
desired
' ' /
not
to
transmit
conversation m
the
room to
1
a
distant
party:
I
I
.
(1)
Depress
ON
OR QUIET button to full
extent
!
of
its
travel
and
hold down
during
entire
ime
transmitter
is to be disabled.
Note:
With
transmitter
disabled conversation
will
not
be
transmitted
to the
distant
party,
however,
distant
party
can still be
heard
over
the
loudspeaker.
~·=
""'
-~
(2)
After
private conversation
is
completed and
it
is
desired
to
transmit
to
distant
party
again, release ON OR QUIET button. System
is now restored to full hands-free capability.
3.04 To terminate a call on speakerphone, depress
OFF
button
on
transmitter.
ON
lamp will
Page
6
extinguish and speakerphone system will be restored
to
the
OFF
condition.
3.05
Transferring
from
handset
to speakerphone
operation:
(1)
After dialing
or
during a conversation depress
and hold
ON
OR QUIET button
of
transmitter.
(2)
Return
handset
to
mounting,
and
release
ON
OR QUIET button.
(3)
Adjust volume
as
required.
3.06
Transferring
from speakerphone to
handset
operation. Lift
handset
during speakerphone
operation
to
automatically
transfer
to
handset
operation. When
it
is necessary to
transfer
back
to speakerphone,
refer
to 3.05 to
prevent
disconnect.
4. MAINTENANCE
Remove
power
from 1()8.type
loudspeaker
set
before
attempting
any
maintenance
of
speakerphone
components.
Tests
and
Adjustments
4.01 When
system
is
installed or maintenance is
performed
on
any
component,
make
the
following
tests
of
speakerphone operation:
(1)
Place a speakerphone call to
the
testdesk.
(2)
Adjust
loudspeaker
volume
to
moderately
loud listening level.
(3)
Have
test
center
repeat
the
question
"In
what
suburb
does
Joe
live?" several times.
(4)
If
choppiness is
detected
in
the
sentence,
particularly
in
the
first
b in
suburb
and
the
t in
what,
increase
the
distance
between
the
transmitter
and
loudspeaker set.
(5)
Repeat this
test
at
a high listening level by
turning
the
volume
control
to
maximum
volume.
()
0
r~
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....
_..,,.-1'
)
(
(
4.02
If
voice-switching caused by external telepho e
audible signaling devices is encountered:
(1)
Place
audible
signaling
devices
away
from
transmitter
unit,
if
possible.
(2)
Lower
volume
of
audible
signaling
devices
to
level
that
will
not
cause voice-switching
feature
to
operate.
(3)
Install audible signal
cutoff
using
the
"RING
CUTOFF"
or
"AUX
RELAY"
option
as
needed. Use
the
leads to common signal control
and
common
ringer
or
buzzer
circuit
for
this
cutoff
feature
(Fig.
7).
4.03
If
speakerphone
fails
to
operate
properly,
refer
to Table A
for
trouble analysis.
Cleaning
4.04 Clean plastic covers and housings with
water
dampened KS-2423 cloth
or
equivalent. Do
not
use
scouring powders
or
cleaners.
Removal
of
Plastic
Parts
()
Do
not
attempt
any
changes
or
repairs
0
()
to
either
the
680-type
transmitter
or
108-type
loudspeaker
set
other
than
to
replace
the
loudspeaker
set
mounting
cord
or
the
respective
plastic
parts
for
either
the
transmitter
or
loudspeaker
set.
4.05 The plastic housing on the 108-type loudspeaker
set
is held in place by two
screws
located
ISS
2, SECTION 512-700-100
on
the
bottom
of
the
set.
To remove
the
plastic
housing, remove the two
screws
from
the
bottom
of
the
set
and
slide
the
cover
off
the
chassis
(Fig.
3).
Note:
Do
not
remove
the
circuit
board
from
the
chassis.
4.06 The plastic covers on the 680-type
transmitter
snap into place.
First,
remove the
stationary
cover by squeezing with
fingers
on the
front
and
back
surface
and
lifting
gently.
Second,
pry
up
the
rocker
cover
with
fingers,
lifting
along
the
edge
adjacent
to
the
thumb
wheel.
The
loudspeaker
and
transmitter
are
designed
so
that
color
significant
components
can
be
easily
changed.
In
order
to
reduce
shelf
faventory
it
is
suggested
that
the
kits
listed
in
1.09
be
stocked
instead
of
extra
loudspeakers
and
transmitters.
Change
of
Loudspeaker
Set
Cord
4.07
First
remove
housing
as
in 4.05.
Next,
loosen
the
screws
that
hold
the
spade tips,
and
remove
the
spade
tips.
Next
remove
the
screw
that
fastens
the
stay
band
of
the
cord. Slide
the
spade
tips
and
wafers
out
the
hole
in
the
bottom
of
the
plastic chassis. To install
the
new
cord,
reverse
the procedures.
Note:
Be
careful
not
to
damage
the circuit
board,
particularly
the
flexible
areas
of
the
bends.
Page
7
SECTION 512-700-100
TABLE
A
4A
SPEAKERPHONE SYSTEM TROUBLE
ANALYSIS
TROUBLE
INDICATION
PROBABLE
CAUSE
CHECK
Speakerphone
inoperative;
indicator
No
power,
or
open
wiring
Power
supply
outlet
with
a
lainp
does
not
light
neon
lamp
voltage
tester
or
()
equivalent,
or
check
LK
lead
lead
for
open
Lamp
does
not
light
but
K-relay
Loose
connection
in
local
Switchhook
contacts
or
Al
I
(108-type
loudspeaker
set)
wiring
and
LK
leads
for
open
operates
and
releases
when
ON
OR
QUIET
button
is released
Rotary
dial pulses
heard
over
loud-
Dial wiring
For
proper
dial P3
and
P4
speaker
leads
No dial
tone
heard
when
speaker-
Open
wiring
Rl
and
Tl
leads
from
tele-
phone
is
ON,
but
can
be
heard
phone
set
in
handset
l
No
dial
tone
heard
on
speaker-
Open
wiring
Tip
or
ring
from
line
phone
or
handset
Dial
tone
cannot
be
broken
with
Incorrect
wiring
Connection
of
tip
and
ring
dial
when
on
speakerphone
from
telephone
line
to
tele-
phone
set
TOUCH-TONE
dial
inoperative
Dial wiring
For
proper
IT
and
IR
leads
when
speakerphone
is
ON
I Noise
on
speech
transmission
Electro-magnetic
Position
transmitter
on
I
associated
with
fluorescent
pickup
different
area
of
desk,
lamp
operation
table
etc.
to
reduce
noise.
Noise
on
speech
transmission
High level
radio
Install
AR
coded
loudspeaker
associated
with
radio
frequency
frequency
AM, FM,
and
transmitter
interference
etc.
in
immediate
area
)
Page
8
(
"'.-'
{
"
l
..
)
()
0
2 ,
' * *
2.4
10
35
49
0 0
/)
0
19
,
44 ,
'
20 '
21
'
CONN
45
,
CABLE
46
TO
,
'
KEY
22 ,
'
EQPT
47
23
~
48
~
24
49
,
'
25 /
'
50 ,
' /
34
r
36 (
33 '
10
~
32 <
37
~
TO
38
~
OPT!
ON
7 /
PLUG
'
9 (
8 ,
....
II
(
13
(
DBS
12
<
680-TYPE
MTG
CORD
35
f--•
TR
MTR
3
LK
(0-W) , I (
VOL
5
(W-BR)
, 2 (
'
-6.2
8
+6.2
7
(BL-W)
,
' 3 '
(W-BL)
,
' 4 '
+V
9
(BR-W)
,
'
26
'
TVL
6
(G-W)
,
27
~
GND
4
(W-G)
<28
~
ON
20--
(W-0) '
29
~
7
>--------<
32
8 33
9)--
--{34
10)--
--{35
:~~
J
dH
OPTION
PLUG
ISS
2,
SECTION
512-700-100
21
* *
(SEE
NOTE
2)
STRAP
21
19
46
"-'
Al
~
? 0
-
D2.0N
MTG
CORD
~47
(w-o)
(W-G)
L-----7 46
:::
, 48 '
(G-W)
(W-BL)
; 45 ;
(BL-W)
~
49
'
(W-BR)
:::
50 ; (R-BL)
' 22
,,
,
(W-S)
' 23
,,
/
(BR-W)
'
21
;,
(Bl-R)
'
19
'
'
' (S-W)
, 20 , (R·G)
AC
0 )
24
; (G-R)
AC
0 ) 25 '
(o-w)
'
18,,
(BR-R)
'
17;
, (R·BR)
'
,,
16
(R-0)
' 44 '
,
' (R-S)
,
43
; (S-R)
' 42 ;
, (0-R)
'
41
;,
NOTES:
I.
ONLY
LEADS
INVOLVED
IN
SPEAKERPHONE
ARE
SHOWN.
2.
METAL
5TRAP
FACTORY
WIRED
FOR
IAl/IA2,
(Al-2).
MOVE
TO
TERMINAL
19
FOR
IA
KTS,
(AJ-19),
ONLY
WHEN
PROVIDING
BUSY
LAMP
OPTION.
*
THESE
FOUR
TERMINALS
APPEAR
ON
THE
82B
CONNECTING
BLOCK.
2
'
19
,
'
44
'
20
'
21
' 45
MTG
,
' 46
CORD
TO
' 22
TELS
ET
' 47
' 23
' 48
24
' 49
'
25
' 50
108 -
TYPE
LSPK
SET
AG
P3-IT
P4-IR
Tl
RI
Al
B-Bl-KSB
B-81-KSC
BL-K5M
20
R-Rl-K48
R-Rl-K4C
~
AC
AC
VOL
-6.2
+6.2
+v
TVL
GND
ON
' '
2.7
20
I
~K4M
.(/\ 2
3
.(/)
4
21
Fig.
6--Speakerphone
Connections using 82-Type Connecting Block
Page
9
SECTION
512-700-100
TO
Ke:Y
!'.QPT
TO
K(Y
E:QPT
Page
10
, - - 82-TYPECONNEC;NG-Bl_OCK
-1
CONN
CABLE:
MOUNTING
r
'"
I
1-
-;;p;;-
ON-
PLUG
- - l I
-----<
20
t-(-----~1
~>
37
I 8 33 I 12
+--+---.
RI
J
81
13132
71
38
t---t---+----<
20
co"o
45
t------+---+-~
32113)
T(36
I 9
---
~~L
-----<
22
10
135)--
YI
I I34
~I
SET
Bl
8 I
31
38 I 7
+--+--___,!-+---<
45
+-----
2s
33 1
12>--
--<10
I
35
~I
----<
50
+------+--t--+-~
3€
t..:_
)--
_ - -
--<3~
11
CONN
CABLE:
RI
8!
108-TYPE
LSPK
SH
~-ui-2_0--+-----4------------7
19
14
l---!/l---+-----4----------~
20
>--+-+--+-+-'
16
17
~-!/l---+-----4----------~21
1--_,,,,)_19_-+-----+----------~23
'--!/l-18_-+-----+----------~22
>---+--~
A.
OPTION
PLUG
POSITIONED
rOR
RINGER
curorr
I -
82-TYPE
CONNECT!
NG
BLOCK
-
-1
MOUNTING
CORD
20
45
1 1
-0PTlONPLuG-
-1
R•
J
t--------+-4
37
137
381
38
20
TO
Bl
T(L
-------+--+
32
I32
71
7
+--+--------<
45
+-----
SET
' 25
50
22
33
133 8 r a
-------+--+
36
I
36
>
T<
II
I
II
+--+----.
10
1
10>--
Y13
1
13
~-+---
9 19
>--
--<35
I
3s
~I
12
~2>--
--<3~
34
~I
-------
I
108-TYPE
LSPK
SET
I
I
20
.---l/Jo---+-----+----------4
19
,_..,
.........
...._.~
14
I}--+----+----------~
20
16
17
.---<h---+-----+----------421
19
t---<h---+-----+----------4
23
>---+---+--~
18
22
J
------------
8.
OPTION
PLUG
POSITIONED
FOR
AUXILIARY
RELAY
OPERATION
Fig.
7-Wiring
Involved
in
Options at 82-Type Connecting Block
0
_)
)
(
(
('.
(
/
(
I
(~)
•
c
'
j
u v
"'
""
<
_,
~
~
~
"'
a::
?'
I I
M2f"G
~
'-'
0
CORD
(SEE NOTE)
(BK)
MISC
CORD
(SPADE-TIPPED LEADS)
TO
TELEPHONE
SET
OR
CONNECTING BLOCK
v u
ID
..,.
u;
..,.
:.:
"'
"'
""
w w
IJ")
>-
a::
I I I
a::
er
"'
....
H - - -
...
<(
' I I
C<
!D
Cf
CL CL
_,
<')
" - - ' '
VJ
"'
(Il
"-
CL
>-
(I'.
er
ID
er
~ ~
"i'
~
~
~
:Jo
~
~
._.)
~
~
a::
er 0 I
'-'
:J<
ID
I
:J<
VJ
I
I I er I ' i
.....
I I
_,
s
a::
E!.
~
'-'
.:9.
01
~
E!.
-
ID
If'
"'
'
-
ID
I
"'
-
(Il
""
<t
~ ~
_,
~
a::
(Il
0
CD
I I I
(I'.
~
~
-
8!181
~----<~
10
/ '
' /
24
POWER
(Y)
UNIT
~----<'35
/ '
' ,
25
L-)
50
'
/
47
'/
22
'
/
19
*
DEAD
DRESSED
'
,r
23
NOTE: '
, 20
(R
l AND
(G)
CONDUCTORS ARE N
NATEO
IN
PLUG
OF
M2FG
CORD
OT
TERM!-
ONLY(BK)
'
,r
49
AND(Y) ARE
USED.
'
, 45
'
,r
48
'
,r
46
D8S
660-TVPE
MTG
'
,r
21
TR
MTR
CORO
*
3-
LK
(o-w)
,
' ,
' *
5-
VOL
(W-BR) ' 2
-------------------------
18
a-
-6.2
(BL-W) ,
' 3
~-----------------------~
17
7-
+6.2
(W-BL) ,
' 4
-------------------------
16
9
+v
(BR-W) ,
'
26+------------------------_,.
44
5-
TVL
(G-W) ,
27+-----------------------~43
4-
GRD
(W-G) ,
28~----------------------~42
2
ON
(W-0)
/
'
29~-----------------------~41
'
,r
',
'
,r
'
/
'
/
'
,
,
'
'
,
>--
,r
'
,
...
,
...
,
'
,r
,
'
/
'
,r
'
,
Fig.
8-Speakerphone
Connections
223A
Using Adapter
ISS
2,
S~CT!ON
512-700-100
D20N
MTG
CORD
(R-G)
(G-R)
(W-BR)
(W-0)
(R-Bl)
(BL-R)
(w-s)
(S-W)
(BL-W)
(W-BL)
(G-W)
(W-G)
(BR·W)
(O·W)
(BR-R)
(R-BR)
(R-0)
(R·S)
(S-R)
(0-R)
108-TYPE
LOUDS
PE
AKER
SET
AC
~
27
AC
-~
28
Al
~
13
AG
Z9
B-BI
-KSB 0
16
R-Rl-K4B
0
20
B-Bl-KSC
~
19
R-Rl-K4C
0
!4
RI 0
II
Tl
~
15
P4-IR
~
10
P3-IT
za
BL-KSM
~
17
c::3
VOL
-6.2
+6.2
+V
TVL
GRD
ON
z2
03
.:::.
4
~I
..0 7
Z5
~21
Page
11
11
Pages
I
J
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