Page 1
BELLSYSTEMPRACTICES SECTION502-503-120
AT&TCo Standard Issue8, July 1982
REFERENCE
2503-TYPE TELEPHONE SETS
IDENTIFICATION AND CONNECTIONS
1. GENERAL control with the exclusion key operated, refer to
1.01 This section contains information for the
2503C manufacture discontinued (MD) and 2.03 The 2503C (MD): With the exclusion key
2503CM (modular) (Fig. 1) telephone sets. Refer to operated (up position) this telephone set may
Section 502-500-110 for common maintenance infor- be used with the J1D402B data set to provide data
mation for 0- and 1-button telephone sets. service. With the exclusion key nonoperated (normal
1.02 The reasons for reissuing this section are
listed below. Revision arrows are used to era- Note: The relationship of features to exclu-
phasize the more significant changes.
• Add the 641E jack 2.04 These telephone sets are used in Data Access
. Add the D-180896 Kit of Parts (polarity owned equipment is connected to the DDD network
guard) through a coupler. Figure 2 and 3 provide connection
• Show the 819040528 (P-90D052)guard assem- phone sets. The 2503CM is a modular set which is
bly MD. shipped with a G15A handset but without the H4DU
2. IDENTIFICATION handset cord or the D8AA mounting cord, which
2.01 The 2503-type telephone sets are desk sets in- 2.05 For application of these telephone sets, refer
tended for use in conjunction with other to Division 590.
equipment to provide DATAPHONE ® data commu-
nications service. 2.06 Table B lists replaceable components for these
2.02 The 2503CM: With the exclusion key
nonoperated (normal position) this telephone 2.07 When a polarity guard is required with these
set may be used with the J1D402B data set to provide sets, install the D-180896 Kit of Parts (guard
data service with monitoring of computer-generated assembly) or the 819040528 guard assembly (MD) as
voice replies. With the exclusion key operated (up shown in Table C. Polarity guards should be installed
position) the set provides regular telephone service, only when authorized by local instructions to prevent
To deactivate monitoring feature, refer to Fig. 3, battery and ground reversals encountered in end-to-
Note 4. To use the telephone set to provide data set end signaling installations.
Table A.
position) the set provides regular telephone service.
sion key differs in the 2503C (MD) and 2503CM
telephone sets.
Arrangements (DAA) where the customer-
information on the 2503C (MD) and 2503CM tele-
must be ordered separately.
sets.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A. Page 1
Page 2
SECTION 502-503-120
EXCLUSION KEY
FACEPLATE
LATCH
Fig. 1m2503CM Telephone Set
$TABLE A_I
TO PROVIDE DATA SET CONTROL WITH
EXCLUSION KEY OPERATED (2503CM ONLY)
LEAD COLOR
Exclusion
Key
641E or
641D (MD) O-W 8 7
Jack
S E2 L2
R L2 E2
BR 1 R
O R 1
REMOVEFROM CONNECTTO
TERM.STRIP NET. TERM.STRIP NET.
Page 2
Page 3
ISS 8, SECTION 502-503-120
w
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or)
, _
o ,,_
I--- _
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,.C
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:.:.:.:.:.:.:.:,:.: _)
" 0
rjA
_uJ (_1
z_
.... _z
w
_ ....
- g
w , __z
...............................
_ o _
.z _
L_
mz
-r- ....1
Page 3
u
Page 4
SECTION502-503-120
635-TYPE CONN ::i::!RiiiiDBAA iiii::i::ii64 IE i::::::!ii TERM. STRIP TRNSF AND LINE SWITCH NETWORK
BLOCK(NOTES i!iiiiMTG CORDi!ii;ii JACK ii!iii
lAND 2) H_H ii_H_,NOTE3 _H_ CAP. ASSY
["T 5 (W-BL) iii!i_ii!!ilI IAND 2)i_iiiii!il(W-BL) iiiiiiiiiii
I .-------/-A _ • \ ...... :::::-::::
ii::::ii::ii::_(NOTES iiiiiii::ii!AND 4) i::iiiii::iil
(Y) )( h -_
(BR-W) <i::i::i::i]i]i< > -i_iJilC x -b , (Y'
i!::ii::::i::::i iii;i;iiii:: ;;;iiiii;i; / (R) iiiiiii iiii!ii !I_ (R)
','_!'/,iii!i !_i_;_i::i::; i!iil;iiii; y iiii_iiiii_ il;i;i;i;;
........... ::::::::::: ...........
............................ __ ¢_
7 (G- W) ii;i_i;::!!, i!!!!!i!!ii _:;:_:i:!:i :_..... i:i::. , g _ (0 ) 0
i:!:i:iS: '::':':':" ":':':':':'
EXE2/ (S) iiiiiiiii_if iiiiiiiiiii
--_5 iiiii::i::iii 'ii_i..... II _-
_o !ililiiiiiii ;]iii:i]i]i _!!iiiii!i_
;i;i;i;i;_;i iiiiiii'_ii! !!ii!_,_/,_,ii6 w ::;::;_i;_i_ i::;_;_;::;_;
...................... ::::iiii::i:::::: (G) (G)
i_i_?_i ........... "..........
co NN iiiiii::::::i:_ _:##:; ...........
BLOCK i!!!iiiiiii_ iii!iiiiii! ii',ii'_i!!'_i (w)iiiiii!i iii!iiiii iI
,NOTE2, T, (2)8 ( W- BR, <i:_:_:_:i:i:(............ ]):..........( W- BR) ii_ii i]iiiiiI
2 ( W-G ) ...........]/ !_::_::;::;::;ii :_:;:i:_:_' :..L.........
...........:..........iiiiiiiiii
!i!!!ii!iiiii!iiiiiiiiii........... (o,N
<_;_ > (w-G) _gliii:Ca 4
:ii_i!iiiiiii iiii!!_iiiiii _!_i_i!iii_i_!_!:! (BK) ii_iii{ii!! (R)
_,_,:_,'_iiiiiii!ii!iiiii_ ::::::::::::Mii!iii_e_ (_) .iiiiiiii'_._; ...........
MIC 6 (0 -W ) iii_;_;!i !_;_;_"
_._ (w-o) <!mi_i_( )_i_m_i_,,,(W-O)i_ilili;!i;iii,_9 (W) !i!i!iii! e
NOTES:
I. _HEN D8AA MOUNTING CORD IS PLUGGEDINTOTHE 5. THE TELEPHONESET IS FACTORY-WIREDFOR DATA
6_5-TYPECONN BLOCK THE SHORT ACROSS T, TI, CONTROLWITH EXCLUSTIONKEY NON-OPERATED.
ANDR, R1 IS REMOVED. FORDATA CONTROL_ITH EXCLUSIONKEYOPERATED
2. MUSTBEORDEREDSEPARATELY. REFERTO TABLEC.
3. THE 041E JACK MAYAPPEARAS A 641D(MD) JACK 6. TODEACTIVATEMONITORINGFEATUREMOVE(R)
ON OLDERVERSIONSOFTHE TELEPHONESET. TRANSFORMERANDCAPACITORASSEMBLYLEADFROM
4. TO HAVELINE SWITCHINDICATIONONLY, MOVE NETWORKTERMINALL2 TONETWORKTERMINALG.
(O-N) 641E OR 6410(MD) JACKLEADFROM
TERMINAL 8 (OR 7) ON TERMINAL STRIP TO
TERMINAL 10 ON TERMINAL STRIP.
!!i::!::i::i::ii::i::!::ii!i!ii::iiiii::iill d...................... !'_.:Y..:.i."..
Page 4
Fig. 3--2503CM Telephone Set, Connections(Sheet 1 of 2)
Page 5
ISS 8, SECTION 502-503-120
NETWORK i!i!i!iiiii616D iiiiiiiiii!H4DU iiiiiiiiiiilGI5A iiiiiiiiiil DIAL
..................... ............ :::::::::::
iiiiiiiiiilJACK iiiiiiiii_HANDSET iiiiiiiiiilHANDSET !:!:i:!:!:!
iiiiiiiiiii iiiiii!ii.CORD iiiii!!Uii iiiiiii!iil
iiiiiiiiiii iiiiiiiii:(NOTE 2) iiiiiiiiiiii iiiiiiiill
i!ii;iiiilliiiiiiiiiliiiiii!ii!ii _!_i_i_i_i_
iiiiiiiiiii.....!.... !iiiii!ii!ii i_i_i_i;i_i
(G) iiii!iiiili(G) iiiii!iiii!_i_i_i_i_i_ iiiiiiiiiii
(Y) , ii!iiiiiiii il;;;i;;;; ii!i!i_i!ii
[ ;;;;; i_i_i;i;i; _ ..........."
_!_i_i_!_i;i iiiiili!i!ii iiiiiiiiiii
!iliiiiiiii(BK) :!i!i!_i_i_ ililiiiiii iiiiiiiiiil
iiiiii!iiii (R-G) iiiiiii!i!i ;iiiiiiii_ i_i *
ili;;i_i;;; :ii!iiiii!! ii!!;3;!;3i iiiiilili!i
i:i:i:i:i:[
;i:i:i;i:i: iiiiiiiiiii _i_i_i_i_i_ i:i:i:i:i:i=
iiiiiiiiii: iiiiiiliiii i!i!i!i!ii.
....•,:,,..(w) :iiiii!i!i! i;i;iil;;ii _;_i_i_i_i:
-, _:_:_:_:_:: :::::::::::
B (BK) <...........(_ .
F_ _iiiiiiiiii,iiiiiiiiiiI iiii_
L I (_) iiiiiiiiiii iiiiiiiiii, i!ili!i!iii
_ iiiiiiiiiii_ ii;iiiiili_ ...........
!i!i!i!i!ii(BL) iiiiiliiiil
T iiiiiiiiill (R) iiiiiiiiill
(R) _;i;i_i_iii
z:_:_:_:_:_ :::::::::: _
:i:i:_:i:i:. :i:i:!:i:i :::::::::::
_iii_iiiiii_ iiiiiiiiii: ii!iiiiill
.......... :::::::::::
.......... ......:.:.:.:.:. :.:.:.:.:..
iiii!iiiiii iiiiiiiiii! i_i_;_;_!_i
................ :::::::::::
...... :.:.:.:.:.: .:.:.:.:.:.
iiiiiiiiiii;(O-BK) iiiiiliiiii iiiiiiiiii :.........
::::::::::: :::::::::::
......................
iiiiiiiiill i_i'_i_i -
>i_i!iii!iii>(BK)
iiiiiiiiiii TRMTR !iiiiili!i:
...... :::::
.....
i
Fig. 3--2503CM TelephoneSet, Connections (Sheet 2 of 2)
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SECTION 502-503-120
TABLE B
REPLACEABLE COMPONENTS
TELSET HOUSING MTG HANDSET
(NOTE 1) ASSY CORD JACK JACK (NOTE 2)
2503CM-61 G15A-61 840698088 D8AA-87 H4DU 641E 616D
2503C-61 G3A6-61 818636615 D6AA-29 H4CJ or -- -- (P-86D570)
(MD) (P-86C661) H4CL
Note 1: These sets are available in Light Gray (-61) only.
Note 2: Includes 812558039 (P-25E803) cord retainer.
HANDSET DIAL RINGER CORD CORD ASSY
35Y3D HIB 818645707
I_TABLE C_l
POLARITY GUARD CONNECTIONS FOR 2503CM AND 2503C (MD) TELEPHONE SETS (SEE NOTE)
TYPE REMOVEFROM
GUARD LEAD COLOR NET. NET. POLARITYGUARD
840364202 Guard
Part of Do180896
Kit of Parts Ringer BK L2 T
819040528 Dial BK RR T
(P-90D052) Guard Line Switch Y C S
Assembly (MD) z
Note: For use when specified by local instructions for end-to-end signaling installations.
* The W-BL lead is used when the 2503CM telephone set is modified and the G lead is used when the 2503C
(MD) set is modified.
Line Cord W-BL (G)* L2 T
Line Switch Y C S
Polarity G L2
Guard W C
Polarity G I RR
Guard W I C
MTG HANDSET FACEPLATE
CONNECTTO
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