reference 500a/b, 500c/d, 500j/k, 501a/b, 501c/d, 501j/k
TRANSCRIPT
I ,_
BELL SYSTEM PRACTICES
AT&TCo Standard SECTION 502-501-101,
Issue 3, July 1972
REFERENCE 500A/B, 500C/D, 500J/K, 501A/B, 501C/D, 501J/K, 554A/B,
554f, AND 556A/B TELEPHONE SETS
1. GENERAL
1.01 This section provides identification and connection information for general purpose
500-type telephone sets.
1.02 This section is reissued to:
• Include D4BT mounting cord
• Revise Fig. 8 and Table F
Changes or additions in the body of tables are indicated by shaded areas.
1.03 Code numbers such as 500C/D cover both manual and dial versions, respectively, of
the same type telephone set to permit converting to either type without changing the code number stamped on the base. The letter R was added to the code number at one time to indicate the set was equipped with a retractile handset cord.
2. IDENTIFICATION
2.01 The 500-, 501-, 554-, and 556-type telephone sets are single line sets for use in common
battery areas, manual or dial.
2.02 501-type telephone sets are identical to a similarly coded 500-type set except for the
addition of a 3-�lement, cold-cathode, gas-filled tube, coded 426A.
2.03 554A/B, F, and 556A/B are standard, wall mounted telephone sets. The 556A/B is the
same as the 554A/B except for the addition of a 426A tube.
2.04 The 554F is factory equipped with a 9-foot handset cord.
2.05 The 554-type sets are suitable for A lead control with wiring modifications.
2.06 500C or 554A manual telephone sets can be ordered modified per D-180405 or D-180406
Kit of Parts, respectively. The kit modifies the set for use with semipublic single slot coin telephone set as an extension station.
2.07 All parts of the set enclosed by the housing mount on the metal base. The network
and line switch are riveted to the base and are not replaceable. Table A list components of these sets.
2.08 Ringers are mounted to base with two P-43A456 washer head mounting screws in
rubber grommets.
2.09 Ringer off position can be provided, when authorized locally, by bending back ringer
stop spring to provide a fifth position (OFF) on the ringer volume control.
2.10 The G1- or G3-type handsets in these sets may be replaced by a G6AR (MD), G6B, or
D-180413 handset for impaired hearing, a G7AR (MD) or G7B for weak speech, or a G8A (MD) or G8B for noisy locations. Refer to section covering these handsets.
2.11 425A, 4-element tube may be substituted for 426A, to care for cases of excessive
power induction. See section entitled Inductive Noise for additional information concerning inductive interference.
2.12 For negative stations in offices without ANI, (R) lead from 426A tube may be
connected to G if ringer operation is marginal.
2.13 Tube assembly is held to base of set with single screw (Fig. 3).
2.14 These sets are available in all standard colors as indicated in Section 500-12(}100. Components
available in color include the dial or apparatus blank, handset, mounting cord, and housing.
@ American Telephone and Telegraph Company, 1972 Printed in U.S.A. Page 1
BSP 502-501-101-i03_1972-07-0l.;pg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:39:08
SECTION 502-501-101
SET CODE DIAL
9ct
TABLE A
THEPHONE SET COMPONENT PARTS
APP BLK§§
95C
NET. RINGER
C4At:t
C4A§
425Ett C4A
HANDSET
Gl- or G3-Type
• MD ** Includes 311A equalizer
t 554F factory equipped with 9-foot handset cord tt Replaces 425B network
t Replaces 7C or 7D dial tt Early models had C2A ringer
§Early models had C3A ringer §§Replaces 95A or 95B apparatus blank
Fig. 1 -5008, D, K, or 5018, D, K Telephone Set
'1 Page 2
Components other than the housing must have the code completed by adding the desired color suffix. The housing P- number must have the desired color suffix substituted for its last two digits.
Note: •The D4BT universal mounting cord is available in ( -29) transparent only .•
3. INSTALLATION AND MAINTENANCE
3.01 Refer to Section 502-500-11 0 for common installation and maintenance information
SSP 502-501-101-i03_1972-07-02.Jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:39:41
ISS 3, SECTION 502-501-101
P-43AI06 SCREW
Fig. 3-501-Type Telephone Set, Tube Assembly
Fig. 2-554- or 556-Type Telephone Set With Hondset
in Waiting Position
SSP 502-501-101-i03_1972·07-03.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:40:13
r
Page 3
SECTION 502-501-101
TABLE B
LINE, RINGER, AND TUBE CONNECTIONS FOR SOOA/B, J/K, AND SOIA/B, J/K TELEPHONE SETS
(NOTE 3)
TIP PARTY IDENT GROUND NEGATIVE (-)
POSITIVE <+l TIP PARTIES
PARTIES WIRE INDIV PARTY
RINGER REV. (NOTE 4)
OR COLOR OR RING
NO NORMAL WHEN CONN
LEAD PARTY CONNECTIONS TO L.L. EQUIP. ·-
BRIDGED I DENT (NOTE 2)
GRD RING TIP RING TIP (1-S) (2-6) <3-n (4-8)
1000!) 2650!l 1000!l 2650!l
R K K K K M R G E E A A Ringer BK G G G G R M K E "E K K Leads s E E E M K G R K K E E
S-R E E E R G K M A A E E
Line Switch s L2-A L2-A L2-A A A A A A A A A
426A Tube R Ll or G Ll or G A A
BK G G E E (3-Element) y E E G G
Mtg R L2 L2 L2 L2 L2 L2 L2 L2 L2 L2 L2 Cord G Ll Ll Ll Ll Ll Ll Ll Ll Ll Ll Ll
in Set y G G G G G G G G G G G
Mtg R R R G G G G G R G R G Cord
at Conn G G G R R R R R G R G R
Blk y G y y y y y y y y y y Line
Ring R R R R R Wire
R R R R R R R
at Tip G G G G G G G G G G G G Conn
Blk Grd y y y y y y y y y y y y
Notes: 1. To silence ringer permanently:
(a) For all classes except tip party identification, connect (Y) mounting cord to same terminal as (R) mounting cord
lead at connecting block.
(b) Tip party identification:
• For lOOO!l ground remove (R) from K of network and insulate and store on unused terminal.
• For 2650!l ground remove ( S) from K of network and insulate and store on unused terminal.
2. If bell taps on stations connected to long line equipment, use these connections to retain party ground identification.
3. When grounded ringer arrangements are used with 96 volt long line circuits, a D-180036 ·ringer isolator must be used.
4. See Note 5, Fig. 4.
Page 4
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ISS 3, SECTION 502-501-101
WIRE OR
LEAD
Ringer
Leads
Line Switch
Lead
426A
Tube
( 3-element)
Mtg
Cord
in
Set
Mtg
Cord
at Conn
Block
Line Ring
Wire
at Tip
Conn Grd
Block
Notes:
TABLE C
500C/D AND 501C/D TELEPHONE SET LINE, RINGER, AND TUBE CONNECTIONS
(NOTE 3)
NEGATIVE (-) TIP PARTY !DENT GROUND PARTIES
TIP (NOTE 4)
INDIV RING
PARTY COLOR OR NO
RINGER REV.
BRIDGED PARTY
I DENT NORMAL WHEN CONN
GRD CONNECTIONS TO L.L. EQUIP. RING TIP
(NOTE 2) (1·5) (2-6) -10000 26500 10000 26500
R L2 L2 L2 K B B G G G
BK G G G G B B K G G
s K K K B K G B A A
S-R A A A B G K B K K
s L2 L2 L2 A A A A L2 L2
R Ll or G Ll or G
BK K K
y L2 L2
R L2 L2 L2 L2 L2 L2 L2 L2 L2
G Ll Ll Ll Ll Ll Ll Ll Ll Ll
y G G G G G G G G G
R R R G G G G G R G
G G G R R R R R G R
y G y y y y y y y y
R R R R R R R R R R
G G G G G G G G G G
y y y y y y y y y y
1. To silence ringer permanently:
POSITIVE ( +) PARTIES
RING TIP
(3-7) (4-8)
L2 L2
L2 L2
A A
K K
L2 L2
L2 L2
K K
G G
L2 L2
Ll Ll
G G
R G
G R
y y
R R
G G
y y
(a) For all classes of service except tip party identification, connect (Y) mounting cord to same terminal as (R)
mounting cord lead at connecting block.
(b) For tip party with 1000 ohms identification ground; remove (R) ringer from K of network and insulate and store
on unused terminal.
(c) For tip party with 2650 ohms identification ground; remove the (S) ringer lead from K of network and insulate
and store on unused terminal.
(d) For the 501C/D telephone set connect (Y) mounting cord lead to same terminal as (R) mounting cord lead at
the connecting block.
2. If bell taps on stations connected to long line equipment, use these connections to retain party ground identification.
3. When grounded ringer arrangements are used on 96 volt long line circuits, a D-180036 ringer isolator must be used.
4. See Note 4, Fig. 6.
Page 5
SSP 502-501-101-i03_1972-07-0S.;pg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:41:09
SECTION 502-501-101
GRO
CONN BLK
RING
TIP
GRO
RING
TIP
GRD
4 I ��fc �{ I I @!j (Y)
I I I
�--.;iitr--------,�#!�1 ;.... . .'..::�:!.._i_:_}j I I I I I I I I I I I
-i!+------'"11;;;."1�1!1 •�::.!......:: _: }1:: Et (S)
Tl P
CONN BLK
RING
GRD
Tl P
RING
GRO
(Y)
(Y)
C4A RINGER AND 426A TUBE
NEGATIVE RING PARTIES
(S·R) (R)
l<s-Y)
(S)
(S)
(S·G)
(s-Y)
Fig. 4-500A/B (MD) and 501A/B (MD) Telephone Sets, Connections (Sheet 1 of 2)
Page 6
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TO T- SH.2 I I I I I
TPA-!542628
FROM SH.I -
ISS 3, SECTION 502-501-101
ll NE SWITCH
(S-G} d e
(5 -Rl
IS-R I
(S-W)
g.{�� I <'� 425A (MD} NETWORK ' 311A EQUALIZER df:
L2 A K E G * 121 0---j E---121 121 121 )
I (NOTE 4} 1!11
-, (BL) I �(NOTE I}- 1/
·:I I '' _j I 1 l.---+--, 7 Rt Mt I i�
I r._,:_�··.i.�_;r :C·:,_.i.i_!_.-.::·:.1 . Rw lli\1 .�\d • .A-
�� r.til ttn� ::,�3:
Gl- OR G3- TYPE HANDSET
(W)
(w) L RCVR
(R) ?J TRMTR
: (BK)
(S-Y)
(S)
(S)
NOTES:
• •r T I 4 � lf.t.' �� L---a-.. -...J �r f'_�_;_:_:_=.•.r.:�-�---mi -��
I. FOR MANUAL SERVICE, MOVE (S-BR) LEAD FROM r T O RR TERMINAL
2. 500 A/B SET FACTORY-WI REO FOR RING PARTY. 501 A/B SET FACTORY-WIRED FOR NEGATIVE RING PARTY. SEE TABLE B FOR CLASSES OF SERVICE NOT SHOWN.
3. ll NE S\11 TCH OFF-HOOK SEQUENCE: (I) ab BREAKS
(2) de MAKES
(3) be MAKES
(4) f g BREAKS
4. 425A NETWORK INCLUDES .311A EQUALIZER.
5. STATIONS WITHOUT ANI,(R) TUBE LEAD MAY BE CONNECTED
TO G IF RINGER OPERATION IS MARGINAL. AT NEGATIVE STATIONS ON 96V LONG LINE CIRCUITS, t R) TUBE "LEAD SHOULD BE CONNECTED TO G.
SAME TERMINALS MAY APPEAR ON RINGER CONNECTION.
OP- DIAL PULSE CONTACTS ON DIAL OFF- NORMAL CONTACTS
TPA-542628
Fig. 4-500A/B (MD) and 501A/B (MD) Telephone Sets, Connections (Sheet 2 of 2)
Page 7
SSP S02-501-101-i03_1972-07.{)7.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:42:02
SECTION 502-501-101
RING
TIP
RING
TIP
Poge 8
500J/K �OIJ/K
C4A CONN 03BN TERMS. CH RINGER BLK MTG ON NET. RINGER
CORD AND (S-G) h 426A
(S-Y nJBE
s (G ) Ll
Tl P s
I I
J GRO
TIP
RING
TIP PARTY 100011 IOENT GRO
(S)
A 1\:'-o--;..+:� _;;:_i: } � i
··::" , ·:s [W ��i .
(S )
.
I I £\j ' I I I POSITIVE RING PARTIES
GRO
I y t�(Y)
I L_ ______ -----
Fig. 5-500J/K (MD) and SOIJ/K (MD) Telephone Sets, Connedions (Sheet I of 2)
BSP S02-501-101-i03_1972-07-08.jpg Scanned by Frank Harrell, !Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:42:23
TO
f- SH.2
I I I
� I
I I I I
_j TPA 542629
FROM SH. I
LINE SWITCH
(S-G} d
425A (MD} NETWORK
Ll L2 A K E G ( 0 0 0---1E----0 0 0 )
i.'.�: . . '.!,, ,�, t 1'�' ,, ::
G " ',, , I _J I l ""l_
�(S-BK) t.i.·.· . ·.:.. �- ,-,. . 7 R*
I 1 *� II RR M'* / .--4���-------++-------------------'
(S-R) (S-R)
i�� ON (w l ��f ]f1*·�����¥$�{ -G-N-----------------------' I (w) ;;;;ll m:;:.;: ::tt:
ISS 3, SECTION 502-501-101
I I i i I
TERMINAL BLOCK
•• �� k,,:.: .. � .. . �.} .. �· :.:.� I
�"'
I � i
Gl- OR G3-TYPE HANDSET
(\1)
A� l �---(_s_-B_K_) __ -+.m#lli� ------�}ffim�--------------------------r�Mf�•
�.·.:$:.·� .... '.:�· ___ RW
����----
��#10�: _______ 1R_ I __ �-;1J TRMTR
(S-W) I �ff c Ifu ij!\ ,--r----�:�ffiww��,,-s-- w-)-----m�e;�------jf II :: II (Wl :::.()
R CVR
(s-Y)
(S)
(S)
NOTEc I, (S-BR) SWITCH LEAD IS CONNECTED TO F TERMINAL IN DIAL
SETS AND TO RR TERMINAL IN MAifJAL SETS. 2. 500 J/K SET FACTORY-WIRED FOR RING PARTY.
501 J/K SET FACTORY-WIRED FOR NEGATIVE RING PARTY SEE TABLE 8 FOR CLASSES OF SERVICE NOT SHOWN.
3. LINE SWITCH OFF-HOOK SEQUENCEc (I) ob-BREAKS (2) de-MAKES (3) be-MAKES
(4) fq-BREAKS
*SAME TERMINALS MAY APPEAR ON RINGER CONNECTION.
IBK}
DP- DIAL PULSE CONTACT ON -DIAL OFF-N ORMAL CONTACT
Fig. 5-500J/K (MD) and 501J/K (MD) Telephone Sets, Connedions (Sheet 2 of 2)
TPA 54 2629
Page 9
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SECTION 502-501-101
50 I C/O
RING R .,, .. (G) TIP l f (R)
Fig. 6--SOOC/D and 501C/D Telephone Sets, Connedions (Sheet 1 of 2)
Page 10
BSP S02-501-101-i03_1972-07-10.jpg Scanned by Frank Harrell, !Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:43:19
LINE SWITCH
{ (G) ( s-G] d FROM SH I -- ..:__(S'-'-) ___ ,
(Y ) I S-Y ]
1 9C, 7C (MD), OR 70 (MD)
I 425B (MD ) OR 425E NETWORK
. DIAL .
• r�' I &.� !1'/ (W )
i;jj I II I s-w] Mil !NOTE 11
(BL) h/j �� I ;::r'
DP II ,i--. '% I # �, I (BL OR G) �r& '-..,.. RR
(BR) IS-BR] IW<
GN
ISS 3, SECTION 502-501-101
I G 1- OR G3- TYPE
' "'"�"
I .;lt] (W)
'� 1I ... ',! ..... � ... t.! .. !J}(R l ls-R] '? *B�--------+-+-��M+�(B=K�)----�
NOTES:
�(BK )[S-BK)
I �(� W�)��--------------------� b� ON* (wl ·9 �� 'M fu i%i I • FOR MANUAL SERVICE, MOVE (W) I S-W) LEAD FROM F TO RR TERMINAL, 2. 500 C/O FACTORY WIRED FOR RINC. PARTY. 501 C/0 FACTORY WIRED
FOR NEG AT I VC R ING PARTY. SEE TABLE C FOR CLASSES OF SERVICE NOT SHOWN.
3, L I Nf SWITCH OFF HOOK SEQUENCE: (I) ab BREAKS (3) be MAKES (2) de MAKES (4) IQ BREAKS
4. STATIONS WITHOUT ANI, ( R) TUBE LEAD MAY BE CONNECTED TO G IF RINGER OPERATION IS MARGINAL. AT NEGATIVE STATIONS ON 96V LONG LINE CIRCUITS, (R) LEAD SHOULD BE CONNECTED TO G.
* SAME TERMINAL MAY APPEAR IN RINGER CONNECTIONS. ( ) CURRENT COLOR CODE
[ ] MD COLOR CODE
DP-DIAL PULSE CONTACT
ON-DIAL OFF-NORMAL CONTACT
Fig. 6-500C/D and 501C/D Telephone Sets, Connections (Sheet 2 of 2)
BSP 502-501-101-i03_1972-07-ll.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:43:48
TPA �42630
Page 11
SECTION 502-501-101
INSIDE WI R£
554A/B, F I ��R�T. �·!� ���GER j
TIP (G) ff L� j); (NOTE 2) iF (G) (S-G] } R I NG;'-'( R"-)�··.,:
·: . ....... f-rl'-{ 22}--4;;!*';i-: ----ii*-( Yr)_:_( S_ -_Y.:_] :u····
\ ',
· .•.•.•. •.•.•.•.••..• (S)
•. , ••.•••. (R)
RING (R
TIP (G)
GRD I Y)
RING(R} Tl P (G)
GRD (Y)
t 2650n
•••••••••• (S)
10000 BRIDGED
Ll � � L2 ';:
fK (R)
B n.
G ,.., IOOOn Tl P PARTY I OOOn I DENT GRD
Ll L2 .fA
;,.
� B fA
G _/">
(S)
(BK) j • � (R)
l'o! (S-R) j TIP PARTY, 265011 I DENT GRD
:�: :::�: J, (S)
(G) (S-G] (Y) (S-Y]
(S)
LINE WIRE :¥�!
556A/B TER�. :{:::• C4A ON NET • �!!!}�
(s-Gj TIP �IG�)�-----+'i;�--�3--ff----�ff-'-�� l �:::::··· RING (�R�)�-----4'�::���+--����----f?------(5-Y]
TIP R lNG
REVERSE FOR Tl P PARTY SERVICE
(G) (R)
REVERSE FOR TIP PARTY SERVICE
AND TIP PARTIES
TO }- SH.2
I I __ _j
TPA 542631
Fig. 7-554A/B, F and 556A/8 Telephone Sets, Connedlons (Sheet 1 of 2)
Page 12
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ISS 3, SECTION 502-501-101
FROfo4 SH. I
LINE SWITCH
(G I [ S-G]
(Y)(S-Y)
d e (W)
9C,7C !MDI
OR 7DIMOI DIAL
js-w)
425E OR 4258 (MOl
NETWORK ��1� �t:� .f:H Ill ��:��� j¥- (NOTE I) lit
GI- OR G3-TYPE HANDSrT
1 r • ::g (w) (fBC::.L'-) ---f*£�'--i;--e; r-:-------{OJ"'):')Il,---filif-i__:_:.:_-<! ··EJY>--(}: RCVR
OP l �� :� / � ��� �+� TRMTR
.__<_o_o_•_
BL +! ...• i'-, _l'-:e-+��AAA..· . ·c=:; ��; g;;: RR ¥H (BR) n; tt:: � . -
(S·BR)
(s) 1-: iii ;;; (BK)
! +'-��;��-)-%�. :�:-�:��-�---f�f!--------G N��-+-� (w) )}
NOTES: I. FOR MANUAL SERVICE, MOVE (W) [S-WJ LEAD FROM F TO RR TERMINAL. 2. 554A!B, F IS FACTORY WIRED FOR BRIDGED SERV ICE,
556.4./B IS FACTORY WIRED FOR NEGATIVE RING PARTY, FOR CLASSES 'Of SERVICE NOT SHO� .. REfER TO TABLE Q,
3. LINE SWITCH OFF�HOOK SEQUENCE: (I) be-MAKES (3) ob-BREAKS (2)de-MAKES (4) gf-BREAKS
4. STATIONS WITHOUT ANI, (A) TUBE LEAD MAY BE CONNECTED TO G IF RINGER OPERATION IS MARGINAL. AT NEGATIVE STATIONS ON 9611 LONG LINE CIRCUITS, {A) LEAD SHOULD BE CONNECTED TO G.
l CURRENT COLOR CO.OE
( ) MO COLOR CODE
OP-DIAL PULSE CONTACT
ON-DIAL OFF-NORMAL CONTACT
TPA 542631
Fig. 7-554A/B, F and 556A/B Telephone Sets, Connedions (Sheet 2 of 2)
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Page 13
SECTION 502-501-101
TABLE D
554A/B, F AND 556A/B TELEPHONE SETi LINE, RINGER, AND TUBE CONNECTIONS
(NOTE 3)
WIRE OR COLOR
LEAD
R
Ringer BK
Leads s S-R
Line Switch s
426A Tube R
BK (3-Element) y
Line Wire Ring R
in Tip G
Set Grd y
• No ground required
Notes:
1. To silence ringer:
TIP INDIV
RING PARTY
OR NO BRIDGED
PARTY I DENT GRD
L2 L2 L2
L1 G G K K K A A A
L2 L2 L2
L2 L2 L1 L1 L1 L2
G* G G
NEGATIVE (-) POSITIVE(+)
TIP PARTY IDENT GROUND PARTIES (NOTE 4)
PARTIES
RINGER REV. NORMAL WHEN CONN
CONNECTIONS TO L.l. EQUIP. RING TIP RING TIP (NOTE 2) (3·5) (2-6) (3·n (4-8)
1000fl 2650!1 1000!1 2650!1
K B B G G G L2 L2
G B B K G G L2 L2 B K G B A A A A
B G K B K K K K
A A A A
L1 or G L1 or G L2 L2 K K K K L2 L2 G G
L1 L1 L1 L1 L2 L1 L2 L1 L2 L2 L2 L2 L1 L2 L1 L2 G G G G G G G G
(a) For the 554A/B and F telephone sets for all classes of service except tip party grd. identification, connect (S) and
(BK) ringer leads on K terminal of 424E network.
(b) For tip party with 1000!1 identification ground, remove the (R) ringer lead from K of network and insulate and
store or connect to spare terminal.
(c) For tip party with 2650!1 identification ground, remove the (S) ringer lead from K of network and insulate and
store or connect to spare terminal.
(d) For the 556A/B telephone set, connect (R) and (BK) ringer leads to K terminal of network.
2. If bell taps on stations connected to long line equipment, use these connections to retain party ground identification.
3. When grounded ringer arrangements are used on 96 volt long line circuits, a D-180036 ringer isolator must be used.
4. See Note 4, Fig. 7.
Page 14
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INSIDE · P-338886 TERMS C4A WIRE .•. � TERM. ON RINGER
STRIP NET. TIP (NOTE 3 I � !NOTE II 3 (RI Cl
01
A (S-R} �� ., 2 0
f " 05
(SI 06 �§ K
(NOTE II 4 ·IBK)
0E1
E2 RING
0 ll
AI(GRD)
�G
A �
L2
I CONVERSION TO "A" LEAD CONTROL
(C URRENT COLOR CODE) (SEE TABLE E)
CONVERSION TO •A• LEAD CONTROL (MD COLOR CODE) (SEE TABLE F)
' I a·
( G)
IBR)
(Y)
(S)
LINE SWITCH
d •
*c
b 0
�+
�+
(NOTE 5 I
(W)
(R)
IBK)
w-I I I I
I I I
(S-BR)}J
[S-R]
[S-BK]
fu"\\ 9C, 7CIMOI OR (NOTE 41 425E OR 425B(MDI Gl-OR G 3-f.. 70(MO) DIAL /_F
NETW�K HANDSET R !WI
I\--- m # A " IBLI
JL
TYPE
RCVR l �E-1 I r " �· DP I TRMTR I �
(G OR BLI l �� $, RR
J (W) [S-BR] c IBKI -
(W) ON :{ (W) GN (W)
" ..
(R) [S-R] '·' m (BK) [S-BK] .•
I NOTES:
I. TO TIP AND RING FOR INDIVIDUAL LINE RINGER OR TO COMMON AUDIBLE S I G NAL LEADS FROM EQUIPMENT CABINET.
2. WHEN RINGER IS USED AS COMMON AUDIBLE, CAPACITOR CAN BE REMOVED BY CONNECTING (S) RINGER LEAD TO A OF NETWORK.
3. MOUNT P-338886 TERMINAL STRIP W ITH P-3 38888 RETAINER AND P-294615 SCREWS. IF THE ABOVE ARE NOT AVAILABLE, CONNECT RINGER LEADS WITH 0-161488 CONNECTORS. INSULATE AND STORE TO AVOID MECHANICAL INTERFERENCE.
4. FOR MANUAL SERVICE, CONNECT TIP OF LINE TO RR TERMINAL OF NETWORK.
5. LINE SWITCH OFF-HOOK SEQUENCE: ( 1) bc.MAKES 13) ab BREAKS ( 2) de MAKES ( 4) IQ BREAKS
6. IN SETS WIRED ACCORDING TO MD COLOR CODE, SWITCHING SEQUENCE IS REVERSED TO PREVENT FALSE HOLDING CONDITION WHEN HANDSET IS RESTORED, SWITCH CONTACTS be MUST BREAK BEFORE de BREAK.
) CURRENT COLOR CODE. [ ] MD COLOR CODE. OP- DIAL PULSE CONTACT ON-DIAL OFF-NORMAL CONTACT
B-188107
'V a ca .fig. 8--554A/B and F Telephone Sets, Modification for "A" Lead Control. • ;;;
BSP 502-S01-101-i03_1972..07-15.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:45:30
SECTION 502-501-101
TABLE E
554A/B AND F TELEPHONE SETS MODIFICATION FOR "A" LEAD CONTROL
CURRENT COLOR CODE
REMOVE CONNECT TO
WIRE OR LEAD
Line Switch
Ringer
Leads
Line Wire
in Set
Page 16
16 Pages
w BR
R
BK
Ring
Tip "A" Lead
Al-Grrl
FROM NET. NET.
TERM. STRIP
F c c G
L2 3 G 4
Ll
F L2
G
TABLE F
554A/B TELEPHONE SET MODIFICATIONS FOR "A" LEAD CONTROL
MD COLOR CORE
REMOVE WIRE OR LEAD FROM
Line Switch
Ringer Leads
Line Wire in Set
[S-W]
(R) (BK)
Ring Tip
"A" Lead Al-Grd
( ) Current color code
[ ] MD color code.
NET.
F L2 Ll
SSP 502-501-101-i03_1972-07-16.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:45:50
CONNECT TO
NET. TERM. STRIP
G
3 4