Page 1
BELLSYSTEMPRACTICES SECTION502-523-401
AT&TCo Standard Issue8, May 1982
SERVICE
2500D, 2500DM, AND 2500DMG TELEPHONE SETS
CONNECTIONS
1. GENERAL 1.04 If 28A ringer isolator is used for ringing range
1.01 This section contains information on the 501-375-101.
2500D (MD), 2500DM, and 2500DMG tele-
phone sets (Fig. 1, 2, 3, or 4 and Table A).
1.02 This section is being reissued to add informa- tive ringing using the 425A electron tube,
tion on 2500DMG telephone set equipped with refer to Section 501-320-100.
72-type dial Fig. 4. Revision arrows are used to em-
phasize the more significant changes.
1.03 SEarly version 2500DMG telephone sets are to Section 501-380-102.
equipped with a 35-type dial plus a separate
polarity guard, later version 2500DMG telephone sets
will be equipped with a 72-type dial which has a 1.07 When end-to-end signaling is provided, install
built-in polarity guard. Refer to Table C for modifica- a 2500DMG set or add the D-180896 Kit of
tions when replacing 35-type dial with a 72-type dial. Parts (polarity guard) to a 2500D or 2500DM set.
Refer to Section 502-503-101 for additional informa- Refer to Table B for polarity guard connection infor-
tion on 72-type dial when used with 2500-type tele- mation and Section 502-503-101 for installation in-
phone sets.e formation.
extension or ringer isolation, refer to Section
1.05 For 4-party full selective or 8-party semiselec-
1.06 If the 603A ringing extender is required, refer
Not for use or disclosure outside the
Bell System except under written agreement
NOTICE
Printed in _T.S.A. Page 1
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SECTION502-523-401
LINE iiiiiiiii!CONN iiiiiiii!iiD3BN i!iiiiiiilRINGER iiiiiiiii!G3-TYPE iiiii!iill4228-TYPE, 425G OR iiiiiiillLINE SWITCH iiiiiiiiiiDIAL
..... .....
WIRE iiiiiiiiii BLK ii!i!i!!i!iMTG CORD !iiii!i!i! (NOTE 1) iiiiiiiiii HANDSET iiiiiiiiii 425K (MD) NETWORK iii!i!iiil :i:i:i:i:i
.:.:.:.:.: :.:.:.:.:
T,P(G__;_ iiiiii!i!i(G__;;i_;i!iiiiilili i_!_i_i_i_(NOTE_)L, _;;;(G) iiiiiiiiii
Ciiiiiii _iiiiiii_i_iiiiiiiiii(S-R) .......... _i_i_i_i_iA F ;_i_ (W) ..........
,:.:.:-:.: :.:-:.:.:. ............... . ..... ..........
........... ,:_:,:,:,:) .......... ;iiiiiiiii_ .......... =
!:i$!:i............ o(BK .......... iiiiiii!i!G RR iiiiiiiiii ii)iiiiill (8K)
.....ii!iiiiii.........................................
iii!iiiill iiiiiiilill;:;;:;;: ..........I ® ili!i!i!ic ::::::::; =
_'At (_ .......... ..................... ? .......... iiiiiiiiii (O-BK)
...... _:_:_:_:_: i_i!i!i_ _i_i_i_i_i _i_i_iiiil ..... c
- R,NG (R) iiiiiiiiiiR iiii;iiiili (R) i!iiiii!ii iiiiiliiii iiiiiiiiil L2 iiiiiiiii{ (Y) _:
:iiiiii!ii_ i ,(_) i;i;i;;ii! i;;;iiiiii i;!iiiiiil(_) ........i
NOTES: i_i_!_i_i_(W) ii!}iiiiii U iiiiiiiiil(aK) iiiiiiiiii
• TABLE A FOR ALL OTHER CLA;SES OF SERVICE. iiiiiiiiii (W) !iiiiiiiii S ;iiiiiiiii(R)
1 WIRED FOR BRIDGED RINGING REFER TO }iiiiiiiil i:_ i:i:;:i_ ;iiiii;iii +_ .....
2 LEADS SHOWN CONNECTED AT S AND T ON iiiiiiiiii @ ;iiiiiiiii (_ iiiiiiiiii
• NETWORK APPEAR ON TERMINALS 10 AND 11 iiiiiiiiii iiiiiiiili iiiilili_i iiiiiiiiii (W-BL) A
RESPECTIVELY, ON TERMINAL STRIP IN SETS iiiiiiiiii (BK) iii!!iiii! B iiiiiiiiil i!iiiiiii! (BL) -
EQUIPPED WITH 425-TYPE (MD) NETWORK. iiiiiilili @ iiiiiiiiii (Z) iiiiiiiiii iiiiiiiiii •
::::::::::: .......... :.:.:.:.:......
....... ........ ..........
:::::::::: :.:.:.:.:. :.:.:.:.:.
•..... ....... ..... _
.............................. ii
iiiiiiii!i ii!iiiiiii ..... ......... _
iiiiiiiiii (R) ii!!i!iiii T i!iiii!!ii !iiiiiii!i (P)
;_;_ e iiiiiiiiiio :i:i:i:;ii i;iiiiiiii--
......... .......... ........-. .,...,..,
iiiii!i!i! iii!iiiill GN !i!!!!iiii iiiiiiiiii (W)
Fig. 1--2500D (MD) Telephone Set, Connections
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ISS 8, SECTION 502-523-401
_NS_DEii!iiiiiii6_'5A iliiiiiiilD'mU !iiiiiiiil62303 ;iiiiiiiiR,NGERiiiiii!i_4228-TYPEiiiiiiiiiiiLINESWITCHiiiiiii!!ilO_AL
WIRE iiiiiiiiil CONN BLK iiiiiiiill MTG ;iiiiiiil; JACK iiiiiiiiii (NOTE 1) ?iiiilill OR 425K ii!!i!iii!i iiiii!iiiii
,,. (_) iiiiiiiiiiiiii.....e_(_)<i_i_i_....................< >_i_i;_;>(_) :_!ii_ii_i......... i!i........./_ i '_:i_ii_i_i!iiiiiiiii..............(_) ½d_;_,_,,_
,NO << >> ..... iiiiiii/ ............
i_i_!_)_). )ii)ii)i)i i_i_!_!_)_ iiiiiiiiii iiiilili! )i)i)iiiiii )iiiil))iii
:::::::::: :::::::::- i:i:!:i:i: .......... ?:i:i:i:i:i
:::::::::: :.:-:.:.:. :::::::::: ::::::::::: iiii!ii_!ii
i_iii_i!il ii_iliiiii iii_iiii!! (BK) iiiiiiiilil (W) iii!iiiiiii
!:!:!:!:!: _!_!!!ii_! :i:_:i:i:i ::::::::::: ilililiiii_
.:.:.:.:.: ....-..... .......... .........
.......... e (BK) ii!iiiiii! iiiililili !iiiiiii!i (S-R) iiiii!iii A !iii}!ii!ii (G)
.:.:.:.:.: ..-.-...- .:.:.:.:.:.: ......
(BK) iiiii;iiii _ < (_ _) !ii!!i!i!i ¢ iiii;i;!i _ ........... ---
......... .:.:.::::: .......... :::::::::: ........... :_:!:i:i:!:
ii!i!ii_ii :::::::::: :::::::::: i_iiiiii_ :i:!:!:i: :_:_:i:i:i: :::::::::::
i!il iiiiiiiiii _;_ iiiiiiiiii= _ _ ,iiii:i:i:i: ::::::i =
......................... :......... .......... _iiii!iii_ ;iiiii_i_i_
(Y) iiiiiiiiil y (y) :i:!:i:!:i iii!iiiill (y) iii!!!ii_i ilililili G C iiiiii!iii!i i_iiiii_ii: (O-BK)
..... :................... _iiiiiiii! ................ iii!i!iii!.
:-:':':':" "......... :!:i:;:_:i '"""" ;:::::::::: ::::::::::
(R) iiiiiiiiilR (R) iiiiiiiiii iiiiiiiiii(R) i!i!!!!!ii !i!i!i!iiL2 iiiiiii!!!!i(Y) _i iiiiiiiiii
iiiiiiiiii .......... i iiii!i!iii (R) iiiiiiiiiiii (S) ii!!iiiii;
NOTES:
I. SET FACTORY WIRED FOR INDIVIDUAL OR BRIDGED RINGING.
SEE TABLE A FOR ALL CLASSES OF SERVICE.
2. MUST BE ORDERED SEPARATELY
..... :.:.:.:.:. :::::::::: ::::::::: :::::::::::
:::::::::: :::::::::: ::::::::::
iiiiiiiiiil}iiiiiiiii!iiiiiiiiiii!iiii_iiii!ii!iiiiiiiiiiiii);;iiiiiiiiiiii!ii;iiiiiiiii;)iiiiiiiiiii)ililil}iiiiiiiii;ili)ii;iiiil)iiiiii!iii!iiiiiiiiiiiiiiiiiiii)iilili;iii;; iiiiiiii!;i
iiiiiiiiii GI5A ililililil H4DU !iiiiiiiii 616D JACK iiii!iiil :ililiiiiill )iii)iiiiii
.......... HANDSET iiiililili HANDSET ;:i:!:!:!: -......... i;3ii_3ii!i :i:;:i:i:;:
;ii .......... :i:i:!:i:iiiiiililil iill iiiii_iiiii iiiiiiiiiii (R-G)
.......... iiiii?ii!i (NOTE 2 ) ii!iiiiiii :iiUiiiiii iiiiiiiiiii
i;i;iiiiii iiiiiiiiil ililililil(W) R i?iil;iiii;i(BK) iiiiiiii!i!
•...w. ".......... I=
........... <..........< >..........> ......... T;iiii!iiiil ,,_,_,,_,:
iiiiiiiiii(G) i!iiiiiiii ii!i!i!i!i(G) i !iiiiiiiiili(R) iii)iiii;il
....i..... :......... iliiiiii)i (BK) i;iiiiiii B i;i!i_i!i3i ;_)_))_m (BL)
..... :!:;:;:;:i iii!i!iiii (R) T )i))))))))i Eii_iii!ii(R)
i ; _iiiiiiiii ......... :.....................
..... "'i'"'i'" iiiiiiiii :::::::::: _:i:i:i:i:i
-......... :.:.:.:.:. ::::::::::: ..........
(BK) < < > > iiiiiiiii _ i!i!i!iii ;;i;;;;; --•...-. .:.:.:.:.: i:_:E:_:i:i
iiiiiiiiii ..................... i_i_i_i_i_;
(R) < < > > ;:_;_: e ii:i:;ii:ii :;i:i:;; -
.......... i!iii!iii GN i:i:!:!:!:i :!:;:i:!:i: (W)
.......... ii_i!i!i! :........ i_!_i_iii!_ iiiiiiiiiil
.........._ ; .......................,o,f
ii!iii!iii i)iil)il})i iiiiiiiiii;(W-BL)
iiiiiii??i _i?;i;;i_ ci:;i:;:;=
.......... :.:.:.:.:.: ::::::::::
'"" ..... ::::::::::: _:i:i:i:i::
iiiiiiiii, _ iiiii;iiii _;;;i:;: =
::::::::::: :i:i:!:i:i:
_!!!!!!!i!! iiiiiiiiiii
.......... :.:.:.:.:.:
Fig. 2m2500DM Telephone Set, Connections
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SECTION 502-523-401
INSIDE 625A D4BU 623D3 RINGER 4228-TYPE LINE POLARITY DIAL
WIRE CONN BLK MTG JACK (NOTE I) NETWORK SWITCH GUARD
TIP (G) _ _ ,) > (G) (G) dxe (W)
(BK) < ), = (S-R) _ (G) =
GRD (Y) < _) > (Y) (_ .... (O-BK) .
CORD
LI T
F
K RR
= (S) _) (_ (BK) =
(w) _
RING (R) _ <_ _> _. (R) / (Y) b vc(BR) S
G15A H4DU 616D JACK
HANDSET HANDSET
CORD (R-G) =
(W) / < > > (W) R
(NOTE 2)
(BK) _ (_ > ,-" (BK) _) (eL) ,
(R) / < > \ (R) _ (R)/\
NOTES:
I. SET FACTORY WIRED FOR INDIVIDUAL OR BRIDGED RINGING.
SEE TABLE A FOR ALL CLASSES OF SERVICE.
2. MUST BE ORDERED SEPARATELY
Fig. 3--2500DMG Telephone Set Equipped With 35-Type Dial and Polarity Guard,
Connections
= (R) __ ._(__a
B
T
;N
_, (W) .
(W-BL ) =
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ISS 8, SECTION 502-523-401
INSIDE 625A D4BU 623D3 RINGER 4228-TYPE LINE DIAL
WIRE CONN BLK MTG JACK (NOTE I) NETWORK SWITCH
CORO
. < > > ,(G)
: (BK)
(BK) _(BK)/<. > : (S R) _ I (G) .
K RR
=(s) Q (D (BK_.
GRD (Y) _(Y) < < ....> > (Y) _ _
Y G C
._._(_I _(.I< < >>(.I '___ °
= (R) / L_ "t-(S)Ia
G15A H4DU 616D JACK
HANDSET HANDSET
CORD
(_(w).,< > > (w) R
"I I g
(G).,< > > (G)
_(R) < < > > (R) (BL)__.
(_(BK) < <, > > (BK) . _ (R) ,
NOTES:
I. SET FACTORY WIRED FOR INDIVIDUAL OR BRIDGED RINGING.
SEE TABLE A FOR ALL CLASSES OF SERVICE.
2. MUST BE ORDERED SEPARATELY
T
GN
(2)--- ----__-
Fig. 4--1_2500DMG Telephone Set Equipped With 72-Type Dial, Connections_l
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SECTION 502-523-401
BTABLE A _1
LINE AND RINGER CONNECTIONS FOR 2500D (MD) 2500DM,
WIREOR LEAD BRIDGED PARTY GROUND 1000_ 2650_
LineWire at G G G G G G
Conn Block
Mtg Cord at
Conn Block G G G G G 13
(2500D) Y G Y Y Y Y
Mtg Cord
in Set G L1 L1 L1 L2 L2
(2500D) Y G G G G G
Jack Conductors R L2 L2 L2 L1 L1
in Modular Set, G L1 L1 L1 L2 L2
2500DM
or 2500DMG only Y G G G G G
Line Switch
Leads Wt F F F C C
Ringer Leads* BK _ G G G B
* To silence ringer permanently for all classes of service, refer to the appropri-
ate ringer section in Division 501.
t This change for tip party does not apply to sets equipped with a 35-type dial
and polarity guard or 72-type dial (2500DMG telephone sets).
Terminal G for 2500D or terminal L1 for 2500DM or 2500DMG
OR 2500DMG TELEPHONE SET
TIP PARTY
INDIV ID GROUND
OR RING NO ID
R R R R R R
Y Y Y Y Y Y
BK B B B B B
R R R R R R
R L2 L2 L2 I Jl L1
S L2 L2 L2 A A
BRt C C C F F
R L2 L2 L1 K B
S K K K B K
S-R A A A B G
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ISS 8, SECTION 502-523-401
STABLE B!
_ _ _ . , ,, ,, ,
POLARITY WIRE OR
GUARD LEAD
....... , .......
D-180896 BR C S
POLARITY GUARD CONNECTIONS (SEE NOTE)
REMOVE FROM CONNECT TO
COLOR
NET. NET. POLARITY
Line
W F T
Switch ........
GUARD
Kit of Parts • _
Guard
Assembly
G F
W C
.......
W F T
Line Switch
819040528 BR C S
(P-90D052) (MD) .........
Polarity G F
Guard .....
W C
............ _., .......
Note" For use with a 35-type dial when specified by local instructions for end-to-end signaling
installations.
STABLE C4
MODIFICATION TO REPLACE 35-TYPE DIAL WITH 72-TYPE DIAL, IN
2500-TYPE TELEPHONE SETS
REMOVEFROM NET.TERM. CONNECTTO NET. TERM.
ORTERM.STRIP OR TERM.STRIP
WIREOR LEAD COLOR (35-TYPEDIAL) (72-TYPEDIAL)
W GN GN
W-BL S S
O-BK C C
Dial BK RR RR
R T T
BL B B
R-G R R
G F F
Line Switch
616-Type Handset R T R
Cord Jack BK B T
Polarity Guard* W C --
BR C or St D_
W F or Tt F
G F --
* Polarity guard should be removed from telephone set.
t Polarity guard terminal.
$ 72-type dial terminal.
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7 Pages
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