reference 500a/b, 500c/d, 500j/k, 501a/b, 501c/d, 501j/k...

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.

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

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

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.

SSP S02-501-101-i03_1972-07-04.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:40:35

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.


3. When grounded ringer arrangements are used on 96 volt long line circuits, a D-180036 ringer isolator must be used.


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)

BSP S02-S01-101-103_1972-07-06.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:41:30

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)

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

BSP 502·501-101-i03_1972..07-09.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:42:57

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)

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

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)

BSP 502-501-101-i03_1972-07-12.jpg Scanned by frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:44:10

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)

SSP 502-501-101-i03_1972-07-13.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29, 2012 23:44:39

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.


3. When grounded ringer arrangements are used on 96 volt long line circuits, a D-180036 ringer isolator must be used.


BSP 502-501-101-i03_1972-07-14.;pg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Jan 29,2012 23:45:00

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

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

reference 500a/b, 500c/d, 500j/k, 501a/b, 501c/d, 501j/k...

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