Bell 502-523-402 Service Manual
BELLSYSTEMPRACTICES SECTION502-523-402
AT&TCo Standard Issue 10, May 1982
SERVICE
2554B, 2554BM, 2554BMP, AND 2554BMPG TELEPHONE SETS
CONNECTIONS
1. GENERAL equipped with a 72-type dial with a built-in polarity
1.01 This section contains information for the ing 35-type dial with a 72-type dial. Refer to Section
2554B (MD) (Fig. 1 and 2), 2554BM (MD) (Fig. 502-503-101 for additional information on 72-type
3 and 4), 2554BMP (Fig. 5, 6, 7, 8, 13, 14, 15, and 16), dial when used with 2554-type telephone sets.Q
and 2554BMPG (Fig. 9, 10, 11, 12, 13, 14, 15, and 16)
telephone sets.
1.02 This section is being reissued to add informa- nections for sets equipped with 4010D or 4228-
tion on the 2554BMPG telephone set equipped type network.
with 72-type dial, Fig. 13, 14, 15, and 16. Revision ar-
rows are used to emphasize the more significant 1.06 Refer to Fig. 6, 8, 10, or 12 for set modifica-
changes, tions when set is equipped with 35-type dial
1.03 When end-to-end signaling is provided, install
a 2554BMPG set or add a D-180896 Kit of
Parts (polarity guard) to a 2554B, 2554BM, or 1.07 Ifa28A ringer isolator is required, refer to the
2554BMP set. Refer to Table A for polarity guard appropriate table in Section 501-375-101 for
connection information and Section 502-503-101 for connection information. If a 603A ringing extender is
installation information, required, refer to Section 501-380-102 for connection
1.04 SEarly version 2554BMPG telephone sets are eight party semiselective ringing is required, refer to
equipped with a 35-type dial plus a polarity Section 501-320-100 for D-180697 Kit of Parts infor-
guard, later version 2554BMPG telephone sets will be mation.
guard. Refer to Table D modifications when replac-
1.05 Refer to Tables B or C for line and ringer con-
and modified for A-lead control.
information. Whenever four party full selective or
Not for use or disclosure outside the
Bell System except under written agreement
NOTICE
Printed in U.S.A. Page I
SECTION502-523-402
L,,E iiiiiiilTER..i_ _,_,,GE, .::-:r° L,,_ iJi_i _o,oo _ G3-_PE_ 0,
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NOTES:
I. WIRED FOR BRIDGED RINGING,REFER TO TABLE B
2. STRAP ON LATER VERSION ONLY,
* INSULATED AND STORED
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..,......, .:.:,:,:.. :::::::: ........,. .:.:.:.:,: .:.:.:.:.: 1,
FOR ALL OTHER CLASSES OF SERVICE.
Fig. 1--2554B (MD) Telephone Set EquippedWith 4010D Network and 35-Type Dial,
......,.,. ........ :::::::::: -:.:.:-:.:
Connections
:::::::::: i:i:!:i:!: i:!:!:!:i:
.....
Page 2
ISS 10, SECTION 502-523-402
LINE PIA RINGER _ LINE SWITCH 4228-TYPE G3-TYPE DIAL
WiRE (NOTE I) _ _ (NOTE 2) NETWORK HANDSET
.....
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...................... _!_:: IST_ (AP ...........
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[i:_i!iiiil RR !iiiii!iiii !:i:i:!:!:i
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NOTES:
I. WIRED FOR BRIDGED RINGING, REFER TO TABLE C
FOR ALL OTHER CLASSES OF SERVICE.
2. ON SOME SETS (S) LiNE SNITCH LEAD IS CONNECTED
TO A OF NETNORK.
INSULATED AND STORED.
Fig. 2--2554B (MD) Telephone Set Equipped With 4228K Network and 35-Type Dial,
"""" !!!!!!!!!!(BR)iiiiiiiiiii':':':':':'':':':':':'
i)iil)iii))i iiiii!!!ii_ !i_!ii_iiii :i:!:!:i:!:
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i:i:!:!:!:E: _i_E_E_E_i ::::::::_:.......................
Connections
:::::::::: ::::::::::: ::::::::::.
.:.:.:.:.:
..................... EEEiEEE_!E
:_:_ :.:.:.:....
Page 3
SECTION502-523-402
L I NE 4010D D I AL
W I RE NETWORK
TIP (G) (G)
G RR (BK)
® -
LI (R-G)
(W-BL)
< )
<
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( ):""i_!i_(R) e
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i:i:i:i:i
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R I NG (R ) ::::::::::: ..... :i:i:i:i:i:
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(BK) -- ")(" ¢ ")("
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_i iEEiEiiEiEE :::::::::::
NOTES:
I. WIRED FOR BRIDGED RINGING, REFER TO TABLE B FOR ALL
OTHER CLASSES OF SERVICE.
2. STRAP ON LATER VERSION ONLY.
3. H4DU CORD MUST BE ORDERED SEPARATELY.
-X- INSULATED AND STORED
:E:E:i:i:E E:i:!:i:i:i iE"..:EEiiiiE iEiiEiiiE_i
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( (b
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E:E:E:E:i:E ................
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:::::::::::
..... •........,,
A
C
Page 4
Fig. 3--2554BM (MD) Telephone Set Equipped With 4010D Network and 35-Type
Dial, Connections
":'_ _ (G) ,-. (NOTE)) ..,:..:_; (BK) _
L,NEO..RN EOL,NE04220TYPEN T. K06'6BO '0U! ) 0AL'
(S ) .. d v e i_.';."i_(W) F iiiii):: (G)
ISS 10, SECTION 502-523-402
:(s-_. lii!i) .,< >> <
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..... iiiiEi!i!!
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.... ............... :::::::::: :.:.:.:.:.
i:::::::i:::"- _!i_i_!:. :i:i:i:i:_ ...............
R ING (R) iiiiiiiii .... iii!iii!ii L;' A iiiiiiiill iiiiiiiiii ::ii::::!::!!!
GRD (Y ) ilili::ili G :i:i:!:!:i :E:E:i:!:i iiiE!i!E!E
::::::::: i:i:i:E:! iii!i!i!!! :i:i:i:i:i :i:i:i:i:i :!:!:i:i:i
......... i_i:i:.: .................... iiiililil; ..........
i:i:E:i:i _!iiiiiiii i:!:i:i:i:
::::::::: ..... •......... ::::::::::
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•.-...... :::::::::: :.:-:-:.:. ..... ..........
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:i:E:i:E: .......... :i:i:E:i:E ::::::::::
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::::::::: ..... ..... ::::::::::
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......... _:_:_:_:: i::i:.!iiii:: iiiiii!!!_ .......... _:_:_:_:!...........
Fig. 4--2554BM (MD) Telephone Set Equipped With 4228K Network and 35-Type
::::::::: ::::::::::
......... !:E:i:i:ij
iiili ..........
NOTES:
I. WIRED FOR BRIDGED RINGING, REFER TO TABLE C
FOR ALL OTHER CLASSES OF SERVICE.
2. ON SOME SETS (S) LINE SWITCH LEAD IS CONNECTED
TO A OF NETWORK.
_. H4DU CORD MUST BE ORDERED SEPARATELY.
-_ INSULATED AND STORED.
Dial, Connections
_i:i:-_iE!:_': iiiiEiiEii ::::":::": :.::i:i:i:i
:::::::::: ..........
iiii:iiiill (R-G)
E:E:E:i:E:
Page 5
SECTION502-523-402
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Page 6
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