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BELLSYSTEM PRACTICES SECTION 502-533-403
AT&TCo Standard Issue 4, June 1977
SERVICE
2511F, 2511H, AND 2511HM TELEPHONE SETS
1. GENERAL TABLE A
1.01 Reissued to: POLARITY GUARD CONNECTIONS
• Show 2511F and H telephone sets MD, Fig. [819040528 (P-90D052) GUARD ASSEMBLY[
1
REMOVEFROM CONNECTTO
• Add D16J mounting cord, Fig. 2 LEAD COLOR
• Delete 2511FM telephone set information
(never manufactured). Dial BK RR T
Line
Switch
Polarity G RR
Guard W C
Note: For use when specified by local instructions
for end-to-end signaling installations.
G-W C S
W C S
NET. NET.
POLARITY
GUARD
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in
U.S.A. Page 1
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SECTION 502-533-403
DESIG ( NOTE2 } RI NGER (NOTE 6) HANDSET
PLUG (NOTES 3,
46
EXCN I (BL) ii!_ii K !ii_!iiii!.
E.0 EXCNK YHTYPEI'ETWOKiiiG3TYPE
I 4, AND 5 )
f Q
(S) STRAP A l}iiiil
L INEI _ (NOTE 5 ) (_
I (w)_
8 L INE SWITCH !i!i!iiiiil
g (BK) _! (W) (_)
d e _ (R)_)
SPI !ii!!i!i!i
CKT ............
......... iiiiii! ii
i!!_i!i!iii
iiiii
...........
!ii!.:..:%
ii%i ..... i!i!ili!i
3. TWO-LINE PICKUP CONNECTIONS PROVIDE FOR RINGING ON
I LINE I. FOR RINGING ON LINE 2, MOVE(S) STRAP LEADFROM
SIG 5. FACTORYVIREO FOR BRIDGED RINGING SERVICE. CONNECTIONS
CKT FOR HIB RINGER SHOWN. IF HIA RINGER IS USED, WIRE
I
2, REMOVE(S) STRAP FROMA OF NETWORKTO I OF T.S.
NOTES: ::::::::::: 6. LEADS SHOWNCONNECTEDAT TERMINALS S AND T ON 425K
I. NTG CORDFOR 2511H TELEPHONESET SHOWN. NETWORKARE CONNECTEDAT TERMINALS LI AND G
251 IF TELEPHONESET IS IDENTICAL EXCEPT RESPECTIVELY IN SETS EQUIPPED WITH 425G NETWORK.
EQUIPPED WITH D20J SPADE-TI PPED NOUNTING CORD. 7. LINE SWITCH SEQUENCE, HANDSET REMOVED:
2. TWO-LINE PICKUP CONNECTIONSPROVIDE FOR EXCLUSION bC-MAKES
ON LINE I. FOR EXCLUSION ON LINE 2, CONNECT (BK) de-MAKES
(Y)p AND (S) EXCLUSION SWITCH LEADS TO TERMINALS 5p Ob-BREAKS
6, AND 7 RESPECTIVELY. fCJ-BREAKS
14 iiiiiiiiii(BL) 4. TO SILENCE RINGER FOR ALL CLASSES OF SERVICE
iiii::iiiiii (S-R) TO A OF NETWORK
Fig. 1--2511F (MD) and H (MD) Telephone Sets, Connections (Factory Wired)
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TERM.I TO TERM.5 AND(BK)RINGERLEADFROMTERM.:>TOTERM.6.
REFER TO APPROPRIATE SECTION IN DIVISION 501.
AS FOLLOWS:
(BK) TO 2 OF TERN. STRIP
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ISS 4, SECTION 502-533-403
LEAD EXCN KEY NETWORK DIAL H40U GISA
PLUG 0ESIG (NOTE I ) (NOTE5 ) HANOSET NAN0tRT
TO
(XCL (eL) x
Sl"A
CORD
(NOTE 7)
(o)
LI
A
LIN( (_)
I
LI_ (V)
2
, < _._ ._
J I
I
I
J
I
8
33:
I
43 I. TMOLINE PICKUPCONNECTIONSPROVIDEFOREXCLUSIONONLINE I.
StG IS NOTREQUIREDDISCONNECT,INSULATEANDSTORE(BK), (Y) AND
CKT (S) EXCLUSIONKEYLEADS.
18." _. TO SILENCERINGERFORALLCLASSESOF SERVICEREFERTOAPPROPRIATE
J RINGERSECTIONIN DIVISION 501.
2, 4. FACTORYMIREDFORBRIDGEDRINGING.
INSULATEDAND STOItI[D CONNECTEDAT TERMINALSLI ANDG, RESPECTIVELY,IN SETSEQUIPPED
(BL) FOREXCLUSIONONLINE E. CONNECT(BK) (Y_. AND(S.) EXCLUSION
NOTES:
KEYLEADSTOTERMINAL5_, 6, AND'1 RESPECTIVELY.IF EXCLUSION
Z. TMOLINE PICKUPCONNECTIONSPROVIDEFORRINGINGONLINE I.
FORRINGINGONLINE 2, NOVE(S) STRAPLEADFRONTERN. I TO
TERM.5 AND(BK) RINGERLEADFROHTERN.2 TOTERN. 6.
5. LEADSSHOI,INCONNECTEDAT TERMINALSS ANDT ON4251(NETI4ORKARE
I_ITH425(; NETMORK.
6. TO PREVENTA FALS'EHOLDCONDITIONMHENGOINGONHOOKTHETIP AND
RINGLINE SMITCHCONTAC:rSMUSTBREAKBEFORETHEA LEADCONTACTSBREAK.
7. RUSTBEORDEREDSEPARATELY.
8. PROVIDEAI GROUNDAT EXCLUDEDSTATION.
(sx) _
Fig. 2--2511HM TelephoneSet, Connections (Factory W'wed)
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