Bell System Practices 831 Series Installation and operating instructions

BELL SYSTEM PRACTICE S
AT& TCo Standard
SECTION S03 - 702 -101
Issue
9, January 1980
831- AND 2831- TYPE TELEPHONE SETS
IDENTIFICATION, INSTALLATION, MAINTENANCE, AND CONNECTIONS
1. GENERAL
1.01 This section contains information for the
831- and 2831-type telephone sets.
1 .0 2 This section is reissued to:
• Show 83 1 DM and 2831DM telephone set MD
• Show G12A handset (A&M Only)
• Show 3-type speakerphone
MD
• Show 533K diode for use with Station Busy
Lamp,
and Dial Restriction
• Add information
on 831FM and 2831FM
telephone sets
• Add Table
A, ordering guide and replaceable
components
· ·Remove information on P-90D170 polarity
guard
• Remove information on D-18
0656 Kit of
Parts (wall mounting arrangement)
Since this reissue covers a general revision, arrows
ordinarily use to indicatechanges ha ve been omitted.
2. IDENTIFICATION
A. Purpose
2.01 The831-(Rotary dial)and2831-(TOUCH-TONE
"'
dial, Fig. 1) type telephone sets are obtainable
as modul
ar or complete desk-type, 20-button, key
telephone sets equipped to provide stan d ard key
system features. Refer to
Tab le A for available
colors.
Fig . 1-2831DM (MD) or 2831FM Telephone Set
B. Application
2.
02 Used with cent ral office, PBX or
intercommunication line circuits in lAl, 1A2,
or 6A key telephone system (KTS). These sets
are not equipped for u se with lA KTS.
2.03 All 831- and 2831-type telephone sets may
be
used with th e 3- type (MD) or 4A
speakerphone system. When used with 3-type
speakerphone, a
DlOR auxiliary mounting cord may
be required due to the limited number of mounting
co rd conductors.
C. Optional Components
2.04 Optional Components (order separately):
• Diode, 533K. (for u se wi th stat ion busy
lamp)
NOTICE
Not for usc ) OJ' disclosure outside the
Bell System exce pt under writl~n agreement
Pl'inted in U.S.A. Page 1

SECTION
503-702-101
• Diode,
533K
for dial restriction (831-type
sets only)
• Buzzer, KS-8109L2
• Buzzer,
KS-20419L1
(one provided with set)
•
819041971
(P-900197) adhesive backed Polarity
Guard, 2831-type
• Lamp,
51A
(hold button for message waiting)
• Dial, 8CA-58 (for 831-type
set
used with
speakerphone).
D. Ordering
Guide
2.
05
For telephone set, faceplate, and replaceable
components ordering guide, refer to Tables
A a
nd
B.
E. Design
Features
2.
06
Design features for
th
e
831-
and 2831-type
sets are as follows:
• Modular set
• 20-button; a HOLD button and
19
pickup
buttons (all telephone sets except the
[831DM
(MD), 831FM,
2831DM
(MD), and
2831FM],
all pickup buttons
are
convertible to signaling
• 20-button; a HOLD button,
15
pickup, 3
intercom, and 1 RECALL button
[831DM
(MD),
83
1
FM
,
2831DM
(MD), and
283
1FM
TABLE A
only], all i
nt
ercom and pickup buttons are
convertible to signaling
• Automatic Button Restoration (ABR) with
preselect [831DM (MD), 831FM, 2831DM
(MD), and
2831FM]
telephone
set
only
• Multiline Conferencing (MLC)
831DM
(MD),
831FM,
2831DM
(MD), and 2831FM telephone
setsonl
y,
on
pickup lines only (
no
conferencing
on
intercom lines or pickup-to-intercom lines)
• Hold button can
be
illuminated (lamp ordered
separately)
• KS-20419L1 buzzer provided and connected
to dedicated mounting cord leads
• Provisions for mounting KS-8109L2 buzzer
or additional KS-20419L1 buzzer(s) on base
pan
• Provision for polarity guard assembly (optional)
on all
2831
-
type
telephone
sets
except
2831DM
or
2831FM
sets
• Plug-in handset [G12A
(A&M
Only) or
G15A]
•
An
access hole is provided in the P1-type
ringer for ringer biasing spring
adjustment
(refer to Section 501-259-101)
• Limited number of mounting cord conductors
restricts number of optional features wh
ic
h
may
be
simultaneously provided.
If
additional
TELEPHONE
SETS
ORDERING GUIDE
AND
REPLACEABLE COMPONENTS
FACE·
HANDSET
TEL
SET BASE
HOUSING
DIAL
KEY
PLATE
HANDSET
CORD
LAMP
831CM
831CM
832
A-•
8RA-58
647A5C
833A-•
Gl5A·*
H4DU·* 51 A
64785
831FM
831FM
832A·*
8RA-
58
647AH5
,
833A
-•
Gl5A
·*
H4DU
·* 51 A
647AL5C
283
1C
M 2831CM
832A-•
35AF3A
647A5C,
2833A
-•
Gl5A-•
H4DU
-• 51A
64785
283
1FM
2831FM
832A·*
35AF3A
647AH5,
2833A·*
Gl5A
·*
H4DU
·* 51A
647AL5C
• S
ee
Table
8
for
color
suffix
.
Page
2

TABLE
B
COLOR ORDERING GUIDE
HOUSING, HANDSET,
AND HANDSET
CORD
FACEPLATE
COLOR
SUFFIX
COORDINATED
SUFFIX
COLOR
Bl
ack
-03
Charcoal
-70
Ivory
-50
Muted
Ivory
-80
Green
-51
Light
Green
-71
Red
-53
Muted
Red
-69
Yellow
-56
Light Yellow
-72
While
-58
Light
Gray
-73
Light Beige
-60
Muted
Beige
-75
Aqua Blue
-62
Muted
Blue
-76
conductors are required, an auxiliary D10R
cord may be used
• 3-type (MD) or
4A
speakerphone
(paragraph
2.03)
• Tip and ring
are
common to all pickup
buttons through
internal
mounting cord
wiring (current sets) and
co
ntr
ol
strips
(early
sets).
F.
Operating
Features
2.
07
The operating features for the
831-
and
2831-type telephone sets are the same as
all
sta
nd
ard
key
type telephone sets with
the
following exception. The
831DM
(MD), 831FM,
2831DM
(MD), and 2831FM telephone sets provide
the following additional features.
(a)
Multiline
Conferencing:
Any
combination
of pickup buttons may
be
simultaneously
depressed, for this feature, however,
it
is not
possible to conference
CO
/
PBX
lines with the
dedicated intercom lines or intercom lines with
each other.
When
lines
are
conferenced
,
distant
stations
may
have
difficulty
hearing
each
other
and
transmission
quality
is
not
guaranteed.
(b)
Automatic
Button
Restoration
(ABR):
The
ABR
feature releases locked-down buttons
when the hand
set
is restored. The buttons may
ISS
9,
SECTION
503-702-101
be
preset without removing the handset from
the cradle.
(c)
Line
Recall:
An amber-capped recall
button is provided to simulate switchhook
flash without releasing the buttons. This button
is located on the left end of the top 10-button
key.
(d)
Intercom:
Three buttons are dedicated
to the intercom feature. These buttons are
located
on
the right end of the lower 10-button
key and may
be
converted in the
standard
manner to provide signaling or may
be
used for
CO/PBX lines. However,
CO
/
PBX
lines when
term
inated
at
these
positions
will n
ot
be
conferenceable.
3. INSTAUATION
3.01
In
st
all the completely assembled telephone
set
or assemble the required components to
the telephone
set
base (Fig.
2)
.
Note:
On
current
production keys the cap
must
be
properly oriented to lock the cap
on
the button.
3.
02
Individual signaling may
be
provided
by
converting a locking key button to nonlocking.
Remove the
812857738
(P-28E773) locking pin from
the button to
be
converted and modify per Table
C.
3.03
If
an additional buzzer is required, plastic
sc
r
ew
grommets and mounting screws
are
provided for installation. The additional KS-8109L2
or KS-20419L1 buzzer must
be
ordered separately.
3.
04
Dial
Restriction.
(1) 831-Type Telephone
Set
.
(a) Install a
533K
diode between terminals
RR
and F of the network as shown
in
Fig.
4.
(b) Wire telephone
set
as
shown in Table
E.
(2) 2831-Type Telephone Set: Wire telephone
set as shown in Table E.
(3) Installations as described above will restrict
dialing on all lines of the respective telephone
Page
3

SECTION
503-702
-101
NOU
13\0M
OM
F"~
TEL.t.PHONf SET SAM£
II(CX.Pf
HA$ ROTARY DIA.l AND 833A fA(fii'LAT!!.
Fig. 2 - Stotion
Modular
Arrangement
,
2831DM
(
MD
) or
2831FM
Telephone
Set
set.
To
permit
dialinl{ on
selective
lines,
reverse
tip
and
ring
leads
of
the
line involved
at
the
distr
ibu
tion
terminal
or 66-type conrH'Cting block.
When a 2
Al
m
atr
ix block is u
se
d, the revers
in
g
of
co
ndu
ct
or
s
mu
st
be done
on
the telephone
8et
si
fl
e or the
mat
rix block.
(
4)
Fo
r
add
i
tional
restriction
informati
on,
refer
to
Section
500-155-100.
3.
05
Polarity
l{uard (28.11-type except
th
e 28.'HDM
and
2831
F~1;
soc
paragraph
3.06) should
be
Lr
se
d o
nl
y
wh
en
spccifi~
d
by lo
ca
l in
st
ru
rt
iom: f
or
c
nrl
-t.o-e
nd
sig
na
li
n
l-(
ins
talla
tions where
battery
and
gro
und
r
ever
sa
ls
may
be encoun
tered.
An
81
90
·119
71
(P
-900
1
97)
po
l
arity
guard
as:-;embl
.v
(ad
hesive
back
ed)
is
installed
wh
er
eve
r
space
permits.
Connect
per
Tahle
~
'.
3.06
Th
e 831Dl\·1,
831
FJ\'I.
2831Dl\·l,
and
2831FM
telephon
l!
set
empl
oys
the
2Al
m
at
ri
x hlock
in lieu of the
polar
it
y
1-(ua
rd desc
rib
ed in
pa
raw a
ph
3.05.
Th
e un
it
provid
(•s
eig
ht polarity guard
circ
uits.
One pol
arity
gu<lrd
circuit
is
required
for
eac
h
line
which
is
conferenccable
by
multibutton
depression.
The
polarity
guard
is
located
betwf.'en
the
station
Page
4
side
of
the
line
circuit
and
the
sta
tion
cut-down
field.
3.07
Where co
nditi
.ons
wa
rr
ant,
G8
A6, G12A,
or
GInA hand
set
c
an
be
rep
laced
with
oth
er
t
ypes
as
fo
ll
ows:
• For
impaired
hearin)!
G6-type
•
For
weak
speech
-
G7-type
•
For
noi
sy
location
- GB
·type.
Refer to
Oi
vi~
i
o n
50J
fo
r connections of
these
h
andsets.
When ei
th
er of
the!:~·
handse
ts are used.
an
l-14DU
or
H4CJ
or
e<1uiva
l
ent
handset
cord must
be
u
sed
(S<'C
paragraph
3.08).
3.
08
Insta
lling
S
pad
e-
Tipp
ed
lland
se
t C
ord
s
in
Early
Produ
c
tion
Sets
Equipp
ed
with
Gl2A
llnndset:
'l'o
install
sp
ade
-tipped
ha nd
se
t cord (H4CJ or e
qui
valen
t)
remove J
II
ook
S
t.
ay
hand from
the
cord. Cut
back
and
remove
cord s
heath
to
stayb
and
m
ark
s.
Th
r
rad
spade
-tipped
condu
cto
rs
through
plug (Fi)!.
3)
(spade
tips
must
be
b('nt
to
clear
cord
ent
ran
ce
).
Pull
cord
until
about
l
/,
1-inch
of
cord
sheath
is
in the
central

cavity
of
th
e plug.
Separate
the
conductors
in
to
two
groups
and
tie
an
overhand
knot, pulling the
knot
to
the cord sh
eat
h.
Pu
ll
the cord f
rom
plug
until s
train
relief position is
utta
in
ed by
knot
c
nt
cri
ng
sheath
and r
esting
a!{ainst plug. Feed
spade-tipped conductor
st
raight through jack8
1226
6203
(P-22F620)
and
connect
to
proper
te
rmin
als
.
Insert
pl
ug in jack.
8402
17590
PLUG
Fig. 3
-ln
stalling
Spade-Tipped
Hand
s
et
Cord
lead
s
Note
: On l
ater
version
of
th
e
telephone
se
t
base, a p
lu
g is
no
t required and a notch
is
pro
vi
ded on front lip
of
base
pan f
or
J Hook
Stayband
of nonmodul
ar
type cords.
3.
09
When
adding
speakerphone
to
8.~1-type
telephone
sets,
the
8
RA
dial
must
be
re
pla
ced
by
an
8CA dial (or·der
separat
ely) to provide
th
e
additionaloff-normalco
nta
cts
requiredforspeakerphone
con
nect
ions.
3.
10
Wh
en using
speake
rph
one with telephone
sets
equipped
with
the
new
lin
e
switch
assembly, make
wiring
chang
es shown in
Tab
le I.
The new line switch can be
irle
nti
fi
etl by two
additional l
ead
s w
hi
ch
ar
e Blue (BL).
3.
11
The
83
1F:\1
and
2831FM telephone
sets
may
be
used in all cases
to
directly
replace
the
83
1
DM
(
MD
)
28310
~1
(:'1-10)
telephone sets,
re
spectively.
ISS
9, SECTION
503
-
702
-101
How
ev<'r,
due
to
wmng
cha
nges,
the
DM
codes
<:an
not
always
be used
to
replace
the
J<'
M codes.
4. MAINTENANCE
4.01
:V
Iai
ntenanc
e
of
the
831- a
nd
2831-ty
pe
te
l
ephone
set
should be limited
to
checki
ng
for loose
or
br
oken connections
and
replace
ment
of
item
s
per
local i
nstru
ct
ions.
4.
02
Early
ma
nuf
actu
red
cords
in
neutra
l light
pearl-gray
(-82}
and
dark
gray-brown
{
-83)
ar
e
ra
ted
MD
. All new
mounting
cords
will
be
satin-silver
(-87).
4.03
Cu
rrent
sets
ar
e equipped with a
PlB
ringer
wh ich does n
ot
have
th
e (S-R), (S), (BL)
leads.
For
maintenanc
e purposes,
either
the
PlB
or
PiA
ring
er
may
be
used.
(
Jf
PlA
ringer
is
provided,
insulate
and
store
the
unused leads.)
4.04
~
'
or
maintenanc
e
of
keys,
bu?.z
ers,
dials,
spca
ket·phone compone
nt
s, and pol
ar
i
ty
gu
ar
d,
r
efer
to
approp
ria
te
sec
tions
perta
ining to
these
items.
4.
05
The
current
production 647-iype keys
have
been modified
for
easy
lamp
replaceme
nt
by merely removing the bu tton
cap
and
inse
rting
a 553-typc tool
throu
gh the hole
in
the top
of
the
button
. In
ea
rl
y produ
ct
ion models it is necessa
ry
to remove faceplate, key collar,
and
b
ut
ton f
or
lamp
replacement.
N ote:
When
i
nstalling
or r
eplacing
th
e
6<17
-type key f
or
m
ainte
n
anee
in the
83
1-
and
2831
-ty
pe key
te
l
epho
ne
set,
the
81285
770-1
(P-28
1
·~770
)
l
atch
bar
sp
ring
must
be removed
l.n
JlrPvl'nt
me.ehanic:~l
st
r
ess
on the latch
bar
to
pivot
bar
action.
~·or
information
on
removal procedures,
refer
to
Section 512-230-101.
'felephone
s
et
s s
hould
N01'
be ca
rried
by
the
hand
se
t
cr
adl
e.
Lin
e
sw
itch
fa
ilure
ma
y be
ca
us
ed
by
ap
pl
y
in
g
excess
i
ve
s
tr
a
in
to
th e
ha
nd
se
t
cra
dl
e a
nd
the
line
switch
morm
tin
g
a
rrang
ement.
5. CONNECTIONS
Due to
the
lim
ited
numb
er
of
mou
n
ting
co
rd
c
ondu
ct
ors
the
tele
ph
one
sets
do
n o t
foll
o w s t a
ndard
w ir
ing
Page
5

SECTION
503-702-101
arrangements
(Fig.
5
through
14).
5.01
To
provide mounting cord lead for illuminating
the
HOLD button the ringer or buzzer leads
must be used, meaning, only two of the three
options (ringer, buzzer, or hold lamp) may be
provided
at
the same time.
5.02
To
provide station busy lamp, modify the
telephone
set
wiring and connect the 533K
diode (ordered separately) per Table
G.
5.
03
To
provide priority hold (I HOLD) modify
the telephone
set
per Table H.
5.04
To
provide 3-type (MD) speakerphone leads
in the mounting cord, the buzzer leads along
with the lamp and lamp ground leads from the
last two pickup buttons of the key must
be
used.
An
auxiliary
D10R
cord may be used if these leads
are not available. Refer to Section 512-620-485
for connections and Table
J.
5.
05
To
provide
4A
speakerphone connections
refer to Section 512-740-470 and Table
J.
Page
6
5.06
To
provide polarity guard for all 2831-type
telephone sets except the
2831DM
and
2831FM
refer to Table F. The
2A1
matrix block is
used
as a polarity guard for the
2831DM
and
2831FM
telephone sets (see paragraph 5.
08)
.
5.
07
For schematic information, refer to Fig. 5
through
14
.
5.08
The
2A1
matrix block (ordered separately)
provides
the
polarity
guard
function to
telephone
set
with
multiline
conferencing via
multibutton depression. The matrix block consists
of a 66-type molded plastic connecting block,
containing quick-connect terminals wired and equipped
with eight diode bridges for eight lines. The matrix
block is connected between the line circuit and
the station cut-down field. For connections to the
2A1
matrix block, refer to Table I.
If
a
station
requires
line
ringing
on
a
particular
line,
connect
the
ringing
leads
from
the
key
telephone
set
to
the appropriate terminals
011
the
LINE
SIDE
of
the
matrix
block,
not
to
the
station
side.

ISS
9,
SECTION
503-702-101
TABLE C
PICKUP-SIGNAL KEY CONVERSION
(AU
TELEPHONE
SETS
EXCEPT
OM
AND
FM)
CONVERSION
OPTION
64785
KEY
LEADS
(UPPER
KEY)
(NOTE)
O·W S-W G·R
BL
-
BK
BR-8K
BK
-BR
BK-8L
R·G W-S V -
BR
PPPPPPPPPP
19
19
19
23 23
23 26 26
26
26
PPPPPPPPP
S
19 19
19
23
23
23 26 26 26
27
PPPPPPPPS
S
19
19
19
23
23
23 26 26 27
27
PPPPPPPSSS
19
19
19 23
23 23
26 27 27 27
PPPPPP
S
SSS
19
19 19
23
23 23
27 27
27 27
PPPPP
SS
SSS
19 19 19
23 23
27 27 27 27 27
CONVERSION
OPTION
647
ASC
KfY
LEADS
(LOWER
KEY)
(NOTE)
0-W
S-W G·R
BL
-
BK
BR·
BK BK
-
BR
BK
·
BL
R·G W·S
H
PPPPPPPPP
7 7 7 11 11 11
15
15 15
HPPPPPPPP
S
7 7 7 11
11
11 15 15 27
H
PPPPPPP
SS
7 7 7 11 11
11
15 27 27
HPPPPPPSS
S
7 7 7
11
11 11
27 27 27
HPPPPP
SSSS
7 7 7 11 11 27 27 27 27
HPPPP
SSSS
S
7 7 7 11 27 27 27 27 27
Note
:
Move
(O·
Y)
mo
un
ting
cor
d l
ea
d f
ro
m Lerminal
@
[!1)
to
ter
mi
nal
27
. B
eyon
d five signal
co
nversions
stra
p
ter
min
al 27
to
28
a
nd
mo
ve the
si
gnal l
eads
co
nsecutively
to
te
rmin
al
28
. Exam ple : (BR·B
K)
l
ead
fr
om
te
rmin
al
23
to
28
then (BL·BK ) l
ea
d
fro
m
23
to
28
etc
.
Q
8
31A1M
(
MD
) or 28
31
A1M
(M
D)
ea
r
ly
ver
sio
n.
0
A
ll
ot
her telephone sets except DM and F
M.
Page 7

SECTION 503-702-101
tlABLE Dt
PICKUP SIGNAL KEY CONVERSION [831DM(MD). 831FM, 2831DM(MD), OR 2831FM TELEPHONE SET)
CONVERSION OPTION
647AH5 KEY LEADS
(NOTE I
BL
I BL
I
BL BL-BK BR- BK BK-BR BK-
BL R-G W-S
HPPPPPPPPP 17 17 17 11
11 11
HPPPPPPPPS
Connected via internal mounting
17 17 17
11 11 27
HPPPPPPPSS cord wiring and terminated
on
17 17 17 11 27 27
Term. 7 and can not be converted
HPPPPPPSSS
to signaling. 17 17 17 27 27 27
HPPPPPSSSS 17 17 27 27 27 27
HPPPPSSSSS 17 27 27 27 27 27
Note: Move (0- Y) mounting cord lead from terminal 12 to terminal 27. For sixth signal conversion
strap terminal 27 to a spare terminal and move the (BL-BK) signal lead from 17 to spare ter minal selected.
Page 8

ISS
9,
SECTION
503-702-101
TABLE
E
DIAL
RESTRICTION
MODIFICATIONS
(NOTE 1)
TELEPHONE
LEAD
REMOVE
FROM
CONNECT
TO
SET
FUNCTION
COLOR
NET
. SET
NET
. SET
Line
Tip
G
8 3
831FM
Line
Tip
G
8 3
and
2831FM
Line
Ring R 3 8
Line
Ring R 3 8
Line
Tip
G
8 6
831CM
and
2831CM
Mfg. Line
Tip
G
8 6
2-77
or
later
Line
Ring R 6 8
(Note
3)
Line
Ring
R 6 8
Line
Tip
G
16
6
831CM
and
2831CM
Line
Tip
E/W
New
Line
Switch
G
16
6
and
Mfg.
before
2-77 Line
Ring
R 6
16
(Notes
2
and
3)
Line Ring R 6
16
Line
Tip
G
F 6
831A1M,
831
B1M, Line
Tip
G
F 6
831C,
831CT,
or
831CM
Line Ring R 6 F
E/W
Old
Line
Switch
Line Ring R 6 F
2831A1M,
2831BlM,
Line
Tip
G
8
6
2831C,
2831CT,
or
Line
Tip
G
8 6
2831CM
E/W
Old
Line
Switch
Line
Ring
R 6 8
(Note
3)
Line
Rina
R 6 8
Note
1:
Rotary
dial
telephone
set
must
have a
533K
diode
(ordered
separately)
installed
between
RR
and
F
of
the
network
see Fig. 4.
Note
2:
The
new
line
switch
can
be
identified
by
two
additional
leads
which
are (BL).
Note
3:
On
TOUCH-TONE
sets
dial
restriction
and
polarity
guard
cannot
be
provided
simultaneously.
Page
9

SECTION
503-702-101
TABLE
F
POLARITY GUARD CONNECTIONS
FOR
2831
-
TYPE
TELEPHONE
SET
UMOVE
CONNECT TO
fROM
WIRE OR lEAD COLOR GUARD
NET
. ASSY
NET
.
BK
RR
T
Dial G-W
c
s
Line Switch
w
c
s
Gu
ard
G
RR
As
se
mbly
w
c
N
ot
e:
For
use when specified by local
instructions
for
end-to-end
sig
naling installations.
5331(
DIOOE
(ORDERED
SEPAAATEL
II
F
Of
NET.
RR
Of
NET.
Fig. 4- lnstalling Di
ode
for Di
al
Restricti
on
Page
10
TABLE
G
STATION
BUSY LAMP CONNECTIONS
LEAD
OPERATION
Hold
Key
Remove
fr
om
terminal
22
and
connect
to
27
or
other
(G
-
W)
spare
terminal
Co
nn
ect
as s
hown
or
to
sa
me
533K Diode
spa
re te
rmin
al as
above
(Ordered Separately)
e;
L...o
~
Mtg
Cord
(Y-O)
Remove
from
@
~
(Note)
con
n
ect
to
22
Q
831AlM
(MD)
or
2831AlM
(MD)
early
version
0
All
other
te
lephon
e
sets
Note
:
Use
spare
moun
ting
cord
lead
if
(Y-
O)
lead
is
u
sed
to
provide
other
options
.
TABLE
H
I
HOLD
CONNECTIONS (NOTE)
22
-(/)
LEAD
REMOVE
CONNECT
FROM
TO
Hold
T
(G
-W)
22
7
Key
r
(BK-BL) 7
22
SP
Lead-
Use
(Y-O)*
or
spare
13
mounting
cord
conductor
Note:
For
additional
in
formation
see
S
D-
69530-01
*(Y-0)
lead
may
be
u
sed
unl
ess
connected
for
other
options

TABLE
I
2A1
MATRIX
BLOCK
LINE
LINE
TERM.
STATION
TERM
.
I
LEFTI
(RIGHTI
T 1 l
1 R
5
5
T 7 7
2 R
11
11
T
13
13
3 R 17 17
T
19 19
4 R 23 23
T 25 25
5
R 29 29
T 31 31
6 R
35
35
T 37 37
7 R 41 41
T
43
43
s•
R
47
47
•If
more
than
8 lines are
provided
,
additional
2A1
matrix
blocks
are
required
.
ISS
8,
SECTION
503-702-10
I
Page
11

SECTION
503-702-101
Page 12
TABLE
J
3-TYPE
OR
4A
SPEAKERPHONE
MODIFICATION
FOR TELEPHONE
SETS EQUIPPED WITH NEW
LINE
SWITCH (NOTE)
TELEPHONE
LEAD
REMOVE
FROM
CONNECT TO
SET COLOR
TERM
.
TERM.
831FM,
DM,
CM
or
2831FM,
DM, CM
G
16
8
Mfg. 2-77
or
later
831CM
Mfg.
G
16
F
before
2·77
G
2831CM
Mfg.
G
8
16
before
2·77
Note:
The
new
line
switch
can
be
identified
by
two
additional
leads
which
are (BL).
No
modification
is
required
on
sets
equipped
with
old
ty
pe line
switch
,
[no
(BL)
leads] .

ISS
9,
SECTION
503-702-101
HANDSI!T
liSA
OR
112A
H4DU
OR
CORD
NE,._K
Pill
RINIER LINE SWIT04
HANDSIT
(NOTE
I)
H4DII
JACK
?=1
n.
(WL
CORD
(WI
(NOTE
2)
~
K
_!Ill_
i"'
Ill
I
I
(WI
~
8) 0
'V
~
~
(R)
L2
;;:
'
(Ill)
0
8A_
(T-8)
II
~
)!.Bill
A
.....
(8-T)
R1
.3A6
HANDSET
H4CJ ICA
OR
(NOTE
I)
CORD
IRA
DIAL
~
(W)
8CA
Lf_t
-~
(T)
PI
(WI
~*\
(R)
(T)
P4
~
l
(W)
~
_!Bill_
I
~
*~
!
l/
(W)
/
~
(8)
T
...
,,SJ:
(8) T
~
I:
\1
(ILl
/I /I
/1
f
....
~
lSI
8
(ILl
PULSE
~c.
RRj
Ill
b
(T)
AI
·"'
(8)
'\
c
(8R) A
,\
T
c
(W)
e
d
(8)
R
(
R)
f
(Ill)
g
NOTES
:
1.
LATER
831C
TELEPHONE
SET
IS
EQUIPPED
WITH
A
G3A6
HANDSET
WHICH
IS
WIRED
DIRECTLY
TD
THE
TELEPHONE
SET.
EARLY
PRODUCTION
831-TYPE
TELEPHoNE
SETS
WERE
EQUIPPED
WITH
A
G12A
HANDSET.
831~
TELEPHONE
SETS
ARE
EQUIPPED
WITH
G
15A
HANDSET.
2.
EARLY
PRODUCTION
TELEPHONE
SETS
"AY
BE
E/W
P1A
RINGER
WHICH
WILL
HAVE
(S), (S-R),
AND
(BL)
LEADS
INSULATED
AND
STORED
.
Fig
.
5-Part
of 831A1M (MD).
B1M
(MD)
, C
(MD)
,
CT
(MD). or
CM
(Equipped With Old
line
Switch) Telephone
Set, Connections
Page
13

SECTION
503-702-101
IWIDSET
GISA IWIDSET
IMDU
CORD
NETWORK
PIB
RINGER
LINE SIIITOI
Rail
CORD
J~?<
(NOTE)
~
f------7
K
R
~
0
~
f------7
IRI
0;;"
(Ill)
"""'
(Ill)
f------7
>-'Jill)
aJ..
(Y-8)
81
IQ
A
111-Y)
Rl
ICA
OR
IRA
DIAL
8CA
IKY
~
(Y)
P3
(WJ
:..*~
IYJ
P4
)..
(W)
*:..
(8)
T
/'
e'
d'
~
!Bl)
"-
(BL)
~
-
1/
I
~,.
\I
(Bl)
1\
1'-
/I
F
a
(8)
~
-
(Y)
AI
,
..
,
I'UI.SE
b
~c
RRj
Cll
*
(
Ill
)
Ill
)('
(8)
A
c
c
I
I
IN)
e
d
(8)
R
(R)
,
f
(Ill)
g
NOTE:
TERPIINAL
18
IS
ON
SET
TERPIINAL
BOARD
Fig
. 6-
Part
of 831CM (Equipped With
New
Une Switch
and
Manufactured
Before 2-77) Telephone Set,
Connections
Page
14

ISS
9,
SECTION
503-702-101
HANDSET
G15A
HANDSET
H4DU
CORD
NETWORK
PIB
RINGER
LINE SIUTOI
m:
CORD
JACK
(NOTE)
~
I,.
(WI
__l!!j_
K
8
~
>!- 0
~
~
L2
;::
r-
18K)
0
o,(
(Y-S)
B1
~
:
r!8K)
....,
A
(8-Y)
R1
ICA
DR
IRA
DIAL
8CA
':"y
(Y)
P3
(
WI
~*\
(Y)
P4
~
(W)
1~
/
-
(0)
18
\
1:
\1
l
(Ill
e'
(
Bll
71
71
/I
F'"'
.....__
d' (
8L
)
(BL) Pll.SE
(8)
T
....
i
~c
~~~~~·
OR
"'\
Ill
.....
(0)
B
(0)
T
~
c
~
J
8
a
(S)
b (Y)
A1
'V
(Ill)
A
c
(W)
(0)
A
e -
...
d -
(R) f
(8K)
g
NOTE
:
TERIIINAL
8
ANO
16
ARE
ON
SET
TERIIINAL
BOARD
Fig. 7
-Part
of
831
CM
(Manufactured
2-77
or Later)
Telephone
Set
, Connections
Page
15

SECTION
S03-702-
101
H4DU
OR
H4D8
CORD
112A
OR
G15A
13A6
HANDSU
H4CJ
CORD
HANDSET
(,NOTE
1)
(IIOTI!
1)
IIC'IR
IWI
•
'IW)
~
ll
'IW
I
-,
(W)
'~
~
IJI
(8)
A ( A
J
~
7
,.~
Ill(I
~.111(1
35AF3A
OR
35C3A
DJAL
v v
HANDSET
CORD
-!.-
lJNE
v
'"
JACK
SWJTot
/ /
(
~E
3)
T'
(8) (8)
r!*-
'~
(A
)
(8)
(W)
(II()
•"
(8)
p q
(0)
(0)
(D)
T1
1
L...-(A)
(A)
~
(A)
~
IT
t~
v
"'rt
"-..
~
e
(11-41)
R
(II()
71
..
P11
RJNGIR
w~,
..
~
K (NOTE
2)
~
IRi
(11-11.
)
'' "
~
X
~~
y •
r
7r
II
z
~
_S
r:::-:
*
tt
(W)
A(~
0
~
......
IWR
(II()
~
(II(
)
l I
(Y
-1
) 11
c e
.--
I \
(S-Y)
A1
::~
(W)
18)
R
0 e d
k
(I)
u
..
(Ill
'\!.
:t
(f)
AI
-
..
r
(IR)
A
~
I
(11-11)
•
+*
I
IV)
(
V)
IR
~
t
..-
0
Ft
'r*-
~~*
((HI()
-0
ut
0
L2t
NETWORK
Fig
.
8-Port
of
2831A1M
(MD).
BIM
(MD), C (MD),
CT
(MD). or
CM
(Equipped With Old Line Switch)
Telephone Set, Connections
Page
16

ISS
9,
SECTION
503-702-101
NOTES
FOR
FIG
.
8:
1.
LATER
2831C
TELEPHONE
SET
IS
EQUIPPED
WITH
A
G3A6
HANDSET
WHICH
IS
WIRED
DIRECTLY
TO
THE
TELEPHONE
SET
.
EARLY
PRODUCTION
2831-TYPE
TELEPHONE
SETS
WERE
EQUIPPED
WITH
A
G12A
HANDSET
.
2831C"
TELEPHONE
SETS
ARE
EQUIPPED
WIHT
G15A
HANDSET
.
2.
EARLY
PRODUCTION
TELEPHONE
SETS
"AY
BE
E/W
P1A
RINGER
WHICH
WILL
HAVE
(S),
(S-R),
AND
(BL)
LEADS
WHICH
ARE
INSULATED
AND
STORED
.
3.
TER"INAL
8
IS
ON
SET
TER"INAL
BOARD
.
IF
SET
HAS
BEEN
CONVERTED
IN
SERVICE
CENTER
TO
A
2831-TYPE
AND
HAS
A
4228AA
NETWORK
LEADS
SHOWN
TER"INATED
ON
SWILL
BE
ON
L1,
LEADS
SHOWN
TER"INATED
ON
TWILL
BE
ON
L2
AND
TER"INAL
F
CANNOT
BE
USED
AS
A
SPARE
TER"INAL
.
Page
17

SECTION
503-702-101
IIIT£8:
t.
Cit
t1t
lETS
-ACliiiED
IEFIIRE
2-
n
All)
EQUIPPED
IIITH
NEll
LIIE
SWITCH.
TEIIIIIAI.S
a
.,
ta
N£
19ER&ED.
2.
TEIIIIIAl
a
_,
ta
Nl£
Cit
SET
TEII!ltW.
BDNID
.
H4DU COIID
G15A
HANDSET
IF
SET
IM8
IIWI
aJIMRT£11
II
BERVIC%
COlTER
TO
A 283t-TYP£
_,
HAS
A
4Z!IMIENM
LEADS-
TfiiiiiAT£11
Cit
Stall
IE CJILt.
_,
...
~
lEAD6
-TfiiiiiATED
Cit
T
tall
IE
Cit
l2
_,
T£RIWtA
l
F
CAIIIIT
,
IE
t.u
AS
A
FN!£
TEIIIIIAl
35AF3A
DIAL
v HANDSET COIID
~
.J.,
LINE
SWITOI
'
JACK
'
(NOTE
2)
(G)
,.,.(ll)
(ll),.,_
til
T
k-
,.
p q
(0}
"
Ci
~
i
;a
•'
d'
'C.ill...!
---
T
l
(0)
Tt
NETWORK
A (8-Y) Rt
~
!til
rt
~t
G
(Y-8)
It
y
*
•
(R-G)
R
~
(~
•
"
-
~
X
..
...
l
\I
~l
~
'
(IHI.)
II
/I
~
:
f(V}
PIB
RING!R
~
~
C,.--
r---
....,
::::~
-
rJ
(tit)
RR
(8)
k
:i
(Y)
At
u
..
(8l)
~
(Ill)
A
c
r-
l(tlt)
I l
~
l c
t t
0
(R)
~
Ff
(tlt)t:
0
~
l
tt
T*-
~
;:::,
0
u
~~-
l2t
c
(IHI()
).
(V)
(8)
R
-
(!HI)
•
d
•
,t_
(Y) (Y)
IR
,
Fig.
9-Part
of
2831CM
(Equipped
With
New
Une Switch)
Telephone
Set, Connections
Page
18

T1(0)
__;~-0215
P3 (Y) 0 30
P4 (Y)
IR (Y) 0 24
R1 (1-Y)
11 (Y-8)
12
(IL)
8
R (B) IR)
' 8
T (B)
T
(B)
l
5"
iZ
..
~
..
..
'"
..
,_
N
ISS 9, SECTION 503-702-101
PART DF PIUITIIIII CIIID (CIIID AII&EIIILY *) ~ TEIIWW. BLOCK
(B)
(R)
STRAP o-13 0~ 028
(Ill_ )lTE 3"'
~11
(D-Y)
c~t~
- ~
I~
!
0
~ .
- =
-
..
N -
~
~
5"
ii'Ci
.!.
-
..
..
..
N -
~ ~
'"
STRAP
(Ill)! 3)
01
I
-
i!!
i
A
' .. - ..
~ ..
..
1-1- J 1-1- -
5"
J.
-
N -
(Y) A
(B) T
(R) R
(Y-G)
%
-
..
..
~ ~ ..
N - ~ ~
~t;-~.-i 1-1-1-
1-1-
tJtJttiDfJUtttliJUUtl~iJUtt~
CHAIJIIIII
llaTQt
IIJlD
LifE 1
LifE 2 LIIE 3
P08
L---------------------------~PAII=T~DF~M~7~~~~~y----------------------------------- · ,
Fig. 10-831A1M (MD), B1M (MD), C (MD), CT (MD), CM or 2831A1M (MD), B1M (MD), C (MD), CT (MD),
CM Telephone
Set , Key and Mounting Cord Arrangement (Sheet 1 of 4)
Page 19

SECTION 503-702-101
l!i
A (Y)
T (8)
~ (A)
(Y-G)
(1114)
(81.4)
-
i
I
I • •
~
~
i
.. ..
.. ..
.. I!!
V'V' v~w,Jl,,u,u .J.,-u,.~--ui
PART OF IIJI.WTIIIl OORil ( OORil ASSEIIIL Y •) ~ TEJIIIIW. BI.DCI(
(JIJTE
3)
; :
:::a; ' Iii
,_'I' ~1'~1'~1'.;'1'
l!i
!fi
i :1.
UUU~UUU~UUU~UUU~UUU~UUUY
LIIE 4
LIIE 5
LIIE 8 LIIE 7 LIIE 8 LIIE 8
PART OF 847AI5C KEY
Fig. 10-831A1M (MD). B1M (MD). C (MD). CT (MD), CM or 2831A1M (MD) , B1M (MD), C (MD). CT (MD) ,
CM Telephone Set , Key and Mounting Cord Arrangement (Sheet 2 of 4)
Page 20