Bell 502-523-401 Service Manual

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

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

Page 2

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

Page 3