Western Electric 1A1 User manual

TELEP~HONE
EM
l
I
wesrem Electric

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Copyright, 1955
Westem Electric Company, Incorporated

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I
Table of Contents
General Description ~ ~ ~ ~~ ~~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~. ~ ~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~~~~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~ ~ ~ ~~~ ~~~ ~ ~ ~~~~ ~~ ~~~~~ Page 1
Station Apparatus
Backboard
Bracket
Buzzer
~~~~ ~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -~---~~~~~~~~~~-~
Condenser ~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~
Connecting Blocks ~ ~ ~~~~~~~~~~~~ ~~~
Covers~~~~ ~ ~~-~~~~~~~~~~~~~~
Fuses ~~~ ~~ ~~~~-~~~~~~ ~~~~~~~~~~~
Telephone Sets ~~~~~ ~~~~~~~~-~~~~~~ ~~~~~~~~~~
Cord &Cable Connections~ ~~~~~~~~-~~~~
Common Equipment
19,22
21
26
27
22
~~~~~~~~~~~~~~~~ 18,19,22
~ ~~~~~~~~~ 25
~~~~~~~~~~~~~ 3
22,23
Cabinets ~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~ ~-~~~~~~~-~~~ ~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~
18
14
14
Individual Feature Key Telephone Units~~~~ ~~ ~~ ~ ~~~~
Multi~feature Key Telephone Units ~ ~~~~~~~~~~ ~
Ringing Arrangements ~~~~~~~~~~~~~~~~~~~~~~~~ ~ ~~~~~~~~~~~~~~~~
Power Supply ~ ~~~~~~~~~~~~~~~~~~~~~~~~
Operation
Line Circuits ~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ ~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~
Holding ~~~~~~~~~
Wink ~ ~~~~ ~~~~~~~~~ ~
Intercommunication~
Manual~
Dial ~~~~
Audible Signal ~~ ~ ~~~~~~~~~~~~~~~~~~~~~~~~~-~~~~ ~ ~ ~ ~~~~~~~~ ~
Hypothetical Installations ~~~~~~~ ~~~~~~~~~~~~~~~ ~~~-~- ~~~ ~ ~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~
16,24
24
25
25
26
26
26
26
27
Interconnections Between Units ~~ ~~~~ ~~-~ ~~-~-~~~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~ ~ ~ ~~ ~ ~~~--~~~ ~~ ~ ~ ~ ~~~ ~-~ ~~ ~~~ ~ -~ ~~~~~ ~-~~ ~ ~~ ~~ ~~ ~-~~ ~ ~ ~
31

..
Uleslern Electric
lAl
Key Telephone
System
General Description
The lAl Key Telephone System is a switching sy:;tem designed to provide a method of signaling
cu~tomers stations on one or more lines from a common battery Central Office or PBX without the
assistance of an attendant or operator. The lAl Key Telephone System is a revision of the lA Key
Telephone System incorporating all the features available in the lA System and introducing the wink
and dial intercommunicating features. The cabinet type units of the lA System are replaced by new
cabinet type units with 3 instead of 5 relays per circuit, the relays being of a different type requiring
less mainknance.
The lAl System permits the subscriber to utilize the following features:
a. Answer and originate calls on from one to six central office, PBX, intercommunicating or
private lines.
b.
Hold calls on from one to five central office or PBX Lines.
c.
Answer and originate calls on ringdown tie lines and automatic tie lines between stations
of Key Telephone Systems.
d.
Answer and originate calls on lines to distant individual station telephone sets.
e.
Answer and originate calls on manual or dial intercommunicating lines between stations of
a lAl Key Telephone System.
Any single operating feature described above requires the assignment of one key of the multi·
hutton key telephone sets associated with the lAl System. The multi-button sets have either four or
six buttons and accordingly the features provided with one lAl System are limited to combinations
of either four or less or six or less depending upon the types of telephone sets used.
The combination furnished by a given set may be varied to some extent by making suitable
changes in the connection of the spade tipped leads in the sets as, for example, to convert a pick up
key to a signaling key in those sets arranged for such conversion.
Some codes of telephone sets are equipped with an exclusion key which permits manual cut off
of any other station or group of stations associated with a line appearing at several stations.
Table l on the following page indicates the telephone set codes and feature combinations avail-
ablt• for
USt~ with the lAl System. Circuit Figures l to 4 noted in Table l illustrate the differences in
wirin11: of the various sets. It should be noted as stated in information note 301 that manual sets can
he obtained only by conversion of dial sets.
l

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CIRCUIT NOTE 5:
101. PROVIDE THE KEV TELEPHONE SET IN ACCORDANCE WITH REQUIREMENTS AS INDICATED IN THE
FOLLOWING TABLE- THE CORD CONDUCTOR COLORS ARE SHOWN UNDER THE DESIGNATION Of THE
TERMINALS IN THE SET, EXCEPT WHERE "DO" APPEARS WHICH INDICATES THAT THE SPADE TIP Of
THE CONDUCTOR IS TAPED AND DRESSED UNDER THE TERMINAL PLATE Of THE KEY.
1
I
~- ~-- ------------------------------.--.----------,------------,----~---------~------------~-----------r--------~~----------r~~~"'----.-----------~~~~----------------------
•. FEATURES PROVIDED FOR CODING TO LINE 1 TO LINE 2 TO LINE 3 TO LINE 4 TO LINE 5 TO LINE 6 SIGNALING ST:J~.~N RINGER TO EXCLUDED ~~;o6~ LAMP LEADS
OR SIGNALING OR SIGNALING OR SIGNALING OR SIGNALING CKTS. .AMI" LEADS STATIONS ";,;·,r'
--STATION CONTROL KEY SIGNAL f---~-~-.-----,------,----+--+-.--.-:::BA"'Lc-r:HO-:::L-,D+-.---r--rH-c:O:-L-::Dt--r'-·--1------· HOLD HOLD OLD HOLC
1 l
PI! -:::} ,.
ARRANGEMENT EXCLLAMPSS KT SET CODE CORD KEY RINGTIP OR OR RINGTIP BAL OR RING TrP BAL AOR RING TIP BAL AORRING TIP BALAOR RING TIP AOR SIG.LEADS :R~ BUSY R B RINOJI'-P BALHOLCRI.,TIFLI~E~A:; LI~E LI~E LI:E LI~EL~,
H•HOLD P•PrCKUP S•SIGNAL KEY SEE BUSY I FIG SEE NOTE 301 GOOE CODE AI A A ~- ·~ SIG SIG SIG SIG
pS•CONVERTIBLE PICKUP SIGNAL NOTE LAMP : f--::·-·-- <><~I<,NATION OF TERMINALS ON KEY ANO LAMP TERMINAL STRIPS EXCEPT AS OTHERWIS.£E:-'!S.!.T~A.'.T.£E~D-'---,--,--,--r-,--,--r---r.,.--,--r---,......,-,-~,----,,---j
C•CUTOFF ITURNBUTTON) 310 DIAL .. ANUAL IR IT 18 IH 2R 2Ti DO" 2H 3R 3T l DD" 3H 4R 4T DD" 4H 5R 5T DD" 5H, 6R 6T 6H IS SOR2sj SG L2(0NINO.CL R::~RTHRI ET EB ~E_H_ CR CT 1 LG 2 3 4 5 6
~--P~-Po_Po 1 1 s4iisilw s4oBAW DI4D 3
588
A R G v BK BL w·eR-R BR·GBR·YBR:_eKj_BR·BLBR-w Y·BLY-wf-- .. -· -----~---+--+-+-----4--1-----+-+--+-+----1
e-----..;==-~====----+--1---+--+ -4----+---+-----'r-------~- - f--- -t ~· --- -t- -- t ~ -- -c-- - -
~-~~====~=~~-~-~-JT+--~-2~~s~~~s~s~w~s~~~B~A~w*---J.-~D~I~~~-~3~.---+-hR~~G~~Y~t~a~K~~B~L~~w~e~R~-~R~B~R~~~~~~~~~BLB~w G~ ~BL~w-- 1 --~--e-- s~ ~BK s~L ~w
Ho Po PoPO
1
f----t--.!....-+----+--+--"--+---+---~------' 5eee \
i-----~G=cp~O~P"'o"'·=Po"'2!n"=Po"'s~---!---.f.---J 3 s~;:B~ ~~4A~t ~~_ll~~~3j~~BBC R G ~ :~ :~C..~~~~~ ~~~;~~R-BK~~:R~W R-G R=~~ R-BL ____ -_-- f---+- __ ~~ ~~ ~=~-=- !;~y:: =·1·~ _ -- --c---~;~-KJ--S---BL+S---w+s---6-R+-f----i
__ IH() Po Po Po Po Po I 1---f---r-r---~=- I 564BB\I;Is648A'wl---- '__o2B_A_::i:~
8
_
9
__ A __ +--+f--"R'--+_G,+Y BK _B_l,_ 'II BR--R~~~ sii:YeR·BK BR:el."BFM¥~-~:'(_~BK ~:BL R-w G:Y~e'K"G-BLC..--t-- :~ 1-- -+--- --- ---- Y~Bl~~ --- f--_:::__1--f---- s-vfs::'sK~_:_BL,_ii:-_w S-BR BR
f-~~"'H=io~P=iO."=P~Oi==P~Oi==P~0~
5
~0~~'-i--1f-~J+---·-_- _- ++- _- r_l-·-1o-5-5':64"_lC:tJBV\.W'f5'!'6:::4C"'-A'.":W+--- t---~~5_A- __ 3 ___ t--_
58
_9 _0
_-+----l-R-t-_G--t- __ Y-t !lK __ B'= W BR R ,!!f!.:G BR·Y BR·BK BR--BL BR-W R-G R·Y R-BK R·BL _____ 1---- ____ ___ e-- _ - -G: BL ~ -~--- ~BL y;,v -j - - - . _ S-Y S·BK S-BL S·W+S'-·_,_B_R+-------4-~
[ H0 P0 P0 P0 s0 s0 I v 1 s64Dow s64DAw D25A· 3 5B9 e: R G v BK aL w eR-R eR-G sR-Y eR BK BR-BL sR-w~ ~ ~ t R·BL G·BL iG-w Y-llL v-w ~ s-Y s-eK s-BL s-w ~
f.-~~;;P;;o;;;P;:O;;;p;:O;;;P;:b;;;P;'6;;;;:P;';6~1--i-.j__;f---.j~+-.j--+-3-f-5-6-5A_BV:: 565AAW D34A-3 589C R G . Y BK BL W BR·G BR·Y BR-6K BR·W R·G R·Y R·Bl R·W G·Y G·Bl G·W Y·BK R·13K C·BK BR·BL Y·BL Y-'N~K-13L BK·W BL·W S ~- Y S·BK S·BL S·W S·BR BR BR·F
[ Ho Po Po P6 P6 P~ j v .; v 2 s6sssw s6sBAw --t--D-3_4_A_·_3-+_!5_B_9_a __ +---+-R---t-G-+--' , " , " w " ~';;;:; "'""' ":""_.,' ,,' ,:;, ',_;~ ,. ,:;-~, •-oc C-- ·1l• ,_,, '," .~: l"'~ ' ,_, ~ '~" ':_• ,'~'-R+e ___ R+---1
~-'-H_o_P_O_p_O_p_O_p_~ __ C~-~-.j-~-.j+-.J-
41
-4-~5-6-5E_B_W"·5~6-5~E-A~W-:I-----~·-~D~3~-I-A~-~3-:~-5-8_9_F--:--:~R-.·G~:-- __ -Y_-."B_K_~C-B-Li•-W~j-B-R~---R·LB~R-·-·GLB~R-·~~~,.W~4- •• •oc ~~ ~: __ ~-·~ ':"_~-~-~··~~,--~-~- ~·~-
c=:::) A CIRCLE AROUND A COLOR ABOVf INDICATES A CORD CONDUCTOR • DO INDICATES CONDUCTORS THAT ARE TAPED
L------------'--L..-....L __ __L _ _L __ J._ __ ....L __ __r ____ __L ___ _J._j____.! ____ W_H_IC_H_IS_N_O_T_R_cE_O_U_IR_E_D_F_O_R_U_S E IN THIS SET, AND STORED UNDER THE TERMINAL PLATE OF THE KEY
________________________ _J
INFORMATION NOTES:
310. FOR MANUAL SERVICE REPLACE THE DIAL OF THE CORRE-
SPONDING DIAL
SET (E.G.-540BB) WITH A 958 APPARATUS
BLANK AND TRANSFER THE GREEN KEY LEAD FROM TER-
MINAL "F" TO TERMINAL "RR" ON THE NETWORK TO OB-
TAIN THE MANUAL SET (E.G.-540BA).
302. PROVIDE "M" WIRING WHEN THE BUZZER IS TO OPERATE
ON 60 CYCLE AC, AND PROVIDE "N" WIRING WHEN THE
BUZZER IS TO OPERATE ON DC.
303. All CONVERTIBLE KEY POSITIONS ARE ARRANGED IN THE
SHOP AS PICKUP POSITIONS. TO CONVERT A KEY POSITION
FROM
PICKUP (LOCKING) TO SIGNALING (NON-LOCKING).
REMOVE THE SCREW DET All P-12A892 ENTIRELY FROM THE
PLUNGER AT THE KEY POSITION TO BE CONVERTED. MAKE
THE NECESSARY CONNECTION CHANGES AS SHOWN IN
TABLE C OF THE FIGURE INVOLVED. TO RECONVERT A KEY
POSITION TO LOCKING, INSERT A SCREW DETAIL P-12A892.
304. WHEN USING THE ARRANGEMENT FOR A COMMON SIG-
NALING
KEY FOR TWO OR THREE, PRIVATE AND INTERCOM-
MUNICATING
LINES AS PROVIDED FOR IN FIG. 2, THE SIXTH
KEY IS CONVERTED TO NON-LOCKING AND IS USED AS THE
SIGNALING KEY. THE SIGNALING IS DIRECTED TO THE "S"
OR "S I" LEAD OF THE 2nd 3rd OR 4th LINE, AS REQUIRED,
THROUGH THE CROSS CONNECTIONS SHOWN IN TABLE C
FOR FIG. 2. THE AUTOMATIC CUTOFF FEATURE OF THE IAI
KEY TELEPHONE SYSTEM CANNOT BE USED ON A LINE CON-
NECTED TO THE COMMON SIGNALING KEY.
305. TO PROVIDE FOR A STATION BUSY LAMP FOR THOSE SETS
WHERE SPECIFIC PROVISION FOR THIS FEATURE IS MADE
(SEE TABLE NOTE 101} THE NECESSARY CONNECTION
CHANGES SHOULD BE MADE AS SHOWN IN TABLE A OF
THE PROPER CIRCUIT FIGURE. FOR THE IAI KEY TELEPHONE
SYSTEM IT IS NECESSARY, IN ADDITION, TO PROVIDE A IN91
DIODE (G.E. CO. OR EQUIV.) AND A MIW CORD (OR EQUIV-
ALENT) AND CONNECT THEM AS SHOWN IN FIGURE, WITH
THE DIODE CLOSE ENOUGH TO THE TERMINALS TO PRE-
VENT IT TOUCHING THE CAN OF THE 425B NETWORK. SEE
ALSO CIRCUIT DRAWING, SD-69241-0 I, FOR STATION BUSY
SIGNAL.
306. PROVIDE "Y" WIRING FOR METALLIC RETURN. (METALLIC
RETURN SHALL ALWAYS BE PROVIDED WHEN THE BATTERY
IS NOT LOCATED IN THE SAME BLDG. AS THE KEY TELE-
PHONE SYSTEM OR WHEN IT IS LOCATED IN THE SAME
BLDG. AND rT IS CHARGED OVER METALLIC RETURN FEED-
ERS. METALLIC RETURN SHALL ALSO BE USED ON A-C
SUPPLY). PROVIDE "Z" WIRING FOR CABLE SHEATH RETURN
(CABLE SHEATH RETURN SHALL ONLY BE USED WHEN THE
BATTERY IS LOCALLY GROUNDED AND LOCATED IN THE
SAME BLDG. AS KEY TELEPHONE SYSTEM.)
30i. SETS EQUIPPED WITH CUTOFF KEY PER FIGURE 4 ARE WIRED
IN THE SHOP WITH THE G-W AND R-W LEADS FROM THE
CUTOFF KEY CONNECTED TO TERMINALS "2T" AND "2R"
RESPECTIVELY. AS SHOWN IN TABLE B FOR THIS FIGURE,
THESE LEADS MAY BE CONNECTED BY THE INSTALLER TO
OTHER "R" AND 'T' TERMINALS TO CUT OFF EXTENSION
STATIONS ON LINES OTHER THAN 2. WITH THE IAI KEY
TELEPHONE SYSTEM THE "A" LEAD SHOWN IN FIG. 4 CON-
NECTING TO THE EXTERNAL CONNECTING BLOCK FOR
LINE 2 MUST ALSO BE CONNECTED TO THE CORRESPOND-
ING
LINE.
30L THE RINGER SHOULD BE CONNECTED WITHOUT CON-
DENSER FOR PRIVATE LINE, COMMON OR INTERCOMMUNI-
CATING
LINE SIGNALS EXCEPT WHERE LOCAL INSTRUC-
TIONS
DIRECT OTHERWISE.
30~. THE "R" AND "RR" TERMINALS IN THE TABLES A & BOF EACH
FIGURE ARE ON THE TERMINAL STRIP UNLESS OTHERWISE
SPECIFIED.
31 1'. THE LAMPS ARE NOT REGULARLY FURNISHED AS PART OF
THE CODED SET.
31 I. BLOCKING RING P12A858 CAN BE USED TO MAKE A HOLD,
PICKUP OR SIGNAL KEY INOPERATIVE.
CONNECTION
OF I N91 DIODE FOR USE
WITH STATION BUSY LAMP
IAI KEY TEL, SYSTEM
4258
NETWORK
SEE NOTE 30~
TOTERM.NORM
SEE TABLE A OF
FIGUPE INVOLVED
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TO
SWITCH
*CONNECTIONS PROVIDED
WITH SPADE TIPS
TABLE
3

•
TO LINE AND SIGNALING CIRCUITS DR
TO EXCLUSION K!YS OR CUTOFF KEYS AT OTHER STATIONS
TO LINE &SIG CKT. TO LINE AND
( AUO. SIG. CONTROL l.EAI)g SIGNALING C KT
TO 2ND LINl TO 5TH LINE TO LINE AND SIGNALING CKT.
TO 1ST LINE
TO 3RD LINE TO 4TH LINE
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SEE NOTE 302
RINGER
TERMINAL STRIP
ON KEY ,@,
A
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1SSEr.ABLY
NO
l(~h ' ON 44A BRACKET
TI
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SEE NOTE 301
w
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NORMAL
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DIAL
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PUL~r/
CIA
HAND SET
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425 B NETWORK
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PROVIDED ONLY AS
SHOWN IN NOTE 101
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1ST PICKUP KEY
2ND
3RD PICKUP KEY 4TH PICKUP
KEY
5TH PICKUP
KEY
ONE
TWO
!
SIGNALING SIGNALING
( ( !
KEY
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CORD CONDUCTORS
TO LINE AND SIGNALII CKT OR TO LAMP LEADS IN OTHER
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CORD CONDUCTORS
THESE LEADS ARE TAPED
AND STORED UNDER
TERMINAL STRIPS
TABLE A OF FIG.I
IA-IAI SYSTEM CONVERSION CONNECTIONS OF KEY
AND SWitCH LEADS (SEE NOTE 309)
KEY AND SWITCH LEAD.
KEY TEL SYSTEM
S-W S-G S-Y
y
Y- BK
lA
IB IB N R
IAI
IB
N R M N
TABLE B OF FIG.!
RINGER CONNECTION (SEE NOTE 309)
RINGER OR
BUZZER LEADS
S-R S BK R
SET RINGER USED AS LINE
RINGER ON ANY LINE
SET RINGER USED
AS
PRIVATE LINE RINGER
WITH
OR SET
RINGER
OR
CONDENSER
BUZZER USED
FOR A
COMMON
SIGNAL OR
WITHOUT
OTHER USE (5'EE NOTE
308)
CONDENSER
** T OR R
LEAD
OF LINE INVOLVED
A
A K
RT RR
A A
RT RR
* INDICATES CONNECTIONS INSIDE SET PROVIDED WITH SPADE
TIPS.
FIGURE l
Key and Telephone Circuit
Arranged for Pickup, Holding, Lamps and Signaling
No Convertible Keys
5

•
•
PU
7 D DIAL
SEE NOTE ~01
w
w
G
l
* RR
r-1--1----Jijlf\, y,...-+
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*
61A HANDSET J R
(~_nr7~B~K---------------------r--------~
~
~
-~
S·R f
TO STATION BUSY
LAMP CIRCUIT
~
---------
---------
- ---------- -
TO EXCLUDED
STATIONS
EXCLUSION KEY
PROVIDED ONLY
AS SHOWN IN
NOTE 101
BR-R
~I
HOLD
TO LINE AND SIGNALING CIRCUITS OR TOE XCLUSION KEYS OR CUTOFF KEYS AT OTHER STATIONS (WHEN
(()NNECTEO TO AN I NTERCOMMVNICATI NG Ll NE Cl RCVIT WITH CODE SIGNALING CONNECT THE "S"OR "s1"
LEAD TO THE ASSOCIATED LEAD IN THE INTERCOMMUNICATING CODE SIGNALING CIRCUIT.)
rTO-tST LINE TO 2ND LINE TO 3RD LINE TO 4TH LINE TO 5TH LII;E\
-
I ST PICKUP KEY Z NO PICKUP KEY 3 RD PICKUP KEY 4TH PiCKUP KEY 5TH PICK liP KEY
LAMf"cSTRIP
ON 4
BUTTON
S"TS ONLY
OP SIG KEY OR SIG.KEY OR SIG.KEY
PROVIDED ~N C:NVERTI~=E-E~AB~~ C-A~O NOTE 30\ :J
BUTTON SET ONLY ·7
t--t-~ -----'--. ~ ..... +-------------------+-+--R ~----j
r-t-LG:+-1 -------+-2---- -----4-3------------+-4·-------t-,5
'--tr*-4*~-----+[*-c--------+*--- --·- ----- +*·:-------·f:c*:-'
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TABLE A OF FIG 2
lA -IAlSYs'fEMCONVE RSION ·STATION BUS:CY-"-:Scci::G:-:N--:A-:-L--::-C-::0:-:N-:-Nc:E:-::C-::T:c-10::--::N-::5--,
r----C_ONNECTION OF HOLD KEY AND SWITCH Lf AOS(SEE NOfE 309)
~~[ HOLD KEY a SWITCH-~~~ M IW
SYS. S-W S-G S-Y Y Y·BK C_O_R_D---t---,-o---t
NO STATION lA 18 IB N R M '--
BUSY LAMP IAI IB N R M N
WITH STATION lA SG L2 + N R M
BUSY LAMP IAI IB L2+ R M N G+TONSEENOTE305
!'_T_ER~f<4.1!1AL_()!I~ • .II-£:!WOR~--------------------'
TABLE B OF FIG.2
RINGER AND EXCLUSION KEY CONNECTIONS(SEcNOTE309J
RINGER OR ~X"Ll'~lr···• XEY I
B~fAEOR ,, ~~ t ;, ' . i
S·R S BK R G-·i1fi::-yi~;Y.:v,j:,~
I----;,S-;:E;;T--,-;-Wc;-H:c-E;;-N:::-;U:-:S::-;E::-;Oo;-:;A-;S;-;:;B;:R-;;IO;-;G;:;E;:;D::--t=-f-C--f-il.,
1
.-.!-"lnl~"r--r-~f- --;--
RINGER RINGER ON ANY LINE A K T R I
oR auzuR WHEN us Eo As I WITH ---r --r--
Nor TO BE PRIVATE LINE OR COND. A t<: f
I CUT OFF IN COMMON SI G. 0 R !WITHOUT -t-i RT RR 1
SfT FOSRE~TN~\~~g~ I COND "t;V!AAI I
c------ WHEN USED AS BRIDGED -"* ·-:,.;-;,.:+---t----t
SET RINGER RINGER ON ANY LINE A JK ET ER T R EH EB
~~ ~~l~5~ WHEN USED AS I WITH A K
OFF BY PRIVATE LIN~ OR COND. ET ER RT RR EH EB
EXCLUSION ~g~MOOT~i~\~~~ !WITHOUT A A
~- SEE NOTE 308 I GOND
LINE EXCLUSION
TABLE C OF FIG.2
PICKUP SIGNALING CONVERSION
CONVERT FROM LOCKING TO NON-LOCKING OR VICE-VERSA (SEE NOTE 3031
AND CHANGE L[ADS AS FOLLOWS:
KEY LEADS
NO. OF SIG. NO. OF PRIVATE
KEYS AND INTER-
CONVERTED COMMUNICATING
NO. OF
PICKUP
KEYS
FROMP.U. LINES WITH COMMON Y-BR BR S-BR BK-BR
KEYS SIG. KEY
4 3
BUTTONr-~-1--~---f
SET$ 2 I
5- - MM M X
6
~ 4 I M M M SG_
BUTTON 3 2 - M M SG X
SET 2 3 - M X SG X
4 I 2 M X
5H SG
4 I 3 X X !IH SG
----------·c"'"c-=RD CONDUCTORS _ -· -- -·-- ---~__:_:_:::' __ =:-:::::::--::::-:=· =-==~l=~---'
EXTERNAL CONNECTING~LOCK /1:,_ ~ !1-, !? I *
INDICATES CONNECTIONS IN~IDE SET PROVIDED WITH SPADE TIPS.
t SEE \\_ 1---::- ... -_J; I \'-+-------'/ I \~=--......./_/ I\ I I
~ ~"" ' . .J.tPv.JI' rv/v\ ' _.J_fPv.J~ ""
1
v Tc fv\ fc
t; , ~~ ~ ~fv \V _ ~~\V~- \V ~}
0
2._;~ ~t~~
TO CABLI' \TO 1ST LINE TO ZND LINE TO 3RD LINE TO 4TH LINE ____ TO 5TH I~
SHEAo~ TO LINE AND SIGNALING CIRCUIT OR TO LAMP LEADS IN OTHER SETS,
FIGURE 2
Key and Telephone Circuit
Arranged for Exclusion, Pickup, Holding, Lamps and Signaling
with Individual Signaling Keys or on Private and Intercom-
municating Lines with Common Signaling
Key (See Note 304)
7

•
to
Ll14£ !l TO ,,_ TO EXTENSION RINGER, LISTENING IN
SIG CKT STA TO LINE a SIGNA~ CIRCUITS OR TO EXCLUSION KEYS OR CUTOFF LINE CKT ,CUTOFF STATIOIIS,OR Tl 6 Rl ~ _ TABLE A OF Fl(; 4
(AUO SIG BUSY 1< HYS AT OTHER STATIONS TO LINE 8 SIG CKT (AUX. HOLDING CKT.) r IA-IAI SYSTEM CONV(R'>ION- STATION BUSY-SlG-IIIALCOIIINECTfONS -
c~l~~~l Lt:t T~:'Axr~~~~ED ~ s~~~~~~KT ;-:;:; ISTLINE J.o lN(UINE TO 3RO LINE TO 4TH LINE TOS~~N~K~ ~~c~$~T~~: ~~~ASJ~i6~~~~6~~~~~ CONNECT lOIN OF! HOLD KEY AND SWXtfl::i_LEADS (SEFE NO~OS')
~O:o-,_ "'o: ~ "'_ o- m "':;:r - o: ,_ en :5 ; ~ ~ ~ ~ ~ co cr cr ,_ ro = ;;: "' ::0 ~ ""~,_ I ----~'}, '"" '"'f'P' "'"'" ""'
'· t\' "\1 -·-- -~-----, ::;t ----~-+--+----,·--:;:- < L. _ ·,.-:\ _ L ? ~---,~~- -~ ;:; "\ KT~YL HOLD KEY8tS\IIIfCH LEADS MIW
l/ - - I [; v r ' I; I I;. I; l! ~v I; I;~ ~
0 0
z~ ~T.lTION _If<_ IB JIL rt- R M_ - --
-f----- <r >- ~ r 8USYLAMP IAI 18 111 R M N
p 1- U) w1ht STATION· I_A_ SG- _Lz_• -_-~~~-- R- ,_M
I_ -- - 1-- - --~·- ~------------ tr""----Ex:~::A~o:oo::T~~~c-K--~-'J:.f-----e:=;t::=;t=;t:J-'--l~' • ~~.== ) I -·1---. { -~Q ________ .hr::;U • ~~!~·Ml{P Oil ~:~T~~Il_K_~-· ~-- _::_-----c_N'--=====+-=-~----'
~- I ¥ ;;! ~ ~' j.- -lo>-----lo- <9 >- ~ cr! 3: :.:: .J
_J~ Q)lV~~ ~ ~I I I <!)~aJ!
"'
'
U)
'
U)
! ._:. ;.. ;f; i;; .;: U> cr "' >- m i !I -~ f~f-- _ :;;-+--:lj-4--:;;+ -~+---"'-+--- "'
- ----- - ----- - ---1---~---- -- - -1-------1-- - __ T_H_E_S_E-LEAD_S_A_R_E-TA-P-ED-8--1----+--- '' -+----+-- -1-------· - ------1- f-..-.---
TABLE B OF FIG 4
C4A
RINGER
!700\AL ~-~W A~~ K
SEE NOTE NORMAL•L--~ )B~L=+--*~-<FY'y~--.
301 \~/ ~
OLI
G *
RR
STOREO UNOER TERM STRIP
EXCEPT
AS COVERED IN TABLE *
B FOOT NOTE
1-l--- ,---------------------L·---·-+r·----f--. ;t!, ...... ---+--. I ..
---+--1-----i--------t=*'-----:c·--- ~---------+-----J--#fr -· -----+----l--+----l-+--+----+--+- .. f2'-
1
"----- -- --------+--11-~
,f'_T_ ~~~_li__ EB '": 1! 111 R ~- M 1T IH 2r -+2=-H-f~2_R __ +3_T __ +3_H+3:..R_4 _4_T __ +--4=-H+4_R:.___:.__SG:.___ _____ --------1--x=-T-+- 9X..:.R___,.-c:..T+.::.c:.:JR I
- --~.t:*~··~=~·~~~~f*~~~~·~~~~~~;*~"'*:+f::..J~- ~f: ~f: -="l'~"~~·~~-~·::~:~:K:l=-- :-~~-;!:'_ \ ~-·~~ "~~:~~(.·~;;·-···1\[:~ '• "TL...-lr----1--~
-----f--------- .;,
EXCLUSION
KEY
'-'
'
a:
,..-
d
~
HOLD
0::
"'
(/')~~~
----t--~
1ST PICKUP KEY
-· -----+---+--1---f----+-.......,
'1-· ···--
r--t------
NO PICKUP KEY 3RD. PICKUP KEY 4TH. PICKUP KEY
OR SIG KEY
CONVERTIBLE SEE
TABLE C a NOTE 303
·-
L.
CUTOFF <EY
w ~
l...!!_tt=t.;_r::::::=t:::::::::::!UtJ __ s.-_R ___ ~--~-------------l-Q---'--.]_
SWITCH
c
GN
Vi
II
w
B
*
~ )--,__s_BK --------- -------- ---...J..:Co---.L.U
y
S-BR
I
~t_ ---+-+----- ~.....4-!-------r J I
LAMP STRIP- _ __';~L[G:jl£1 =:t:·-··=::::;~2r:=======:lt~3·;:;;:;~f~l'l
CORO CONOUCTORS -
"' ..J
m >- m
- ------ - ------ - _.;,+-_.,_· 1-- ~---~!----- ---- 0 ----- - -U)+----- - -----
GIA HANOSET
A>
R
II
BK
- ----- - ----- - -----
-----
_j
rl--t------
L--f'r----l--------·11'\-- f/..--j-------fj~p..,-j----------/-~l-----~(
SEE NOTE306l\ !1\\ jJ\ ~
r-(!rJ0I -( ~~0'-+..J ~0--.-JJ~, (,) j3~~'
'- ----'--------~ '---~ !----_:____..:.___; \__~ \.....___C___:____;
TO CABLE ~ST LINE _0 2ND LINE TO 3RD LINE TO 4TH. LiNE;
SHEATH TO LINE IG. CKTS.OR TO L ·~p LEADS 1111 OTHER SETS
EXTERNAL CONN BLOCK
*INDICATE> CONNECTIONS INSIDE SET PROVIDED WITH SPADE TIPS.
[
:--- ~ RtNG(R_,_EXC"i,01QN_- t:<~Y -~CUTOFF ~EY CONNECTIONS(SEENOTE 30
RINGER OR EXCLUSION CUTOFF
BUZZER KEY KEY
f-----,_J,EAD LEADS LEADS
·-·- ____ S-R sfu R G-Y R·Y BK-v.IBR-R G-W R-W
WHEN USED AS :I ... *"
SET BRIDGED RINGER A K T R
RINGER Q.f:I.~~-NO.,ET----+-+-+--+......,1---+-+-+--t--+--1
OR BUZZER WHEN USED WITH A K I
NOT TO BE e,~nkv~~ COND.
CUT OFF
IN ~JG OR FOR Wf:-llcT::-H-:-cOc-U--cT+-----1---4 RT RR
SET OTHER USE I! COND A A
(SEE NOTE
f--.-~-- ~~::;E:-;;D!-A~S:::--+-t-f--if-f--f--+----f-+--1~--l /
SET RINGER BRIOGED RINGER A K I ET ER T** R"" E H EB (
OR BUZZER ~NY LINE
T~N ~~T X"sH~~c-I:V.:.UA-~ST':::EE:CDT---W-IT-H-+-A---4-K+---+-t----f--l--+--+----+-~
EXCLUSION LINE OR COM. COND
KEY SIG OR FOR 1---+---J---4 ET ER RT RR EH EB
OTHER USE WITHOUT A A f
<sE~o~rE coNo I
~----- ~~~~~~-U~S~E~D~A~S~--r--+-+·--r-+---~~--~-+-,.-.+---*--1*
BRIDGED RINGER A K CT CR T R
()J\1 AN'f LINE
WHEN USED AS BOG.
LINE RINGER 11\1
PLACE OF EXTERNAL
6~TB~~~~~ ~fg~~~~N~~REY;_J~~N A **
**
T R
TO BE CUT CUTOFF KEY IS
OFF BY
OPERATED
0
lf!E
0r
X"sH~~~~iH I wiTH 1 A K
LINE OR COM COND
SIG OR FOR 1-----+----+--ICT FR RT RR
OTHER USE WITHOUT I
( SE~O~~TE COND A A
LINE EXCLUSION
OR CUTOFF
EXCLUSION
ON LINE I OR NOT USED =..:..:::...:,.-,1-=T--r~IR~-~~H--r-IB~----r~
EXCLUSION ON OTHER I lA KEY TEL SYSTEM T"" R*" H"*
18
t
THAN LINE 1 I IAI KEY TEL SYSTEM T** R"" H"" EB
CUTOFF ON TIP 8 RING OF ANY LINE
CUTOFF OF HEAD RECEIVER USED AS A
Ll STEN lNG IN SET
* * OF THE LINE INVOLVED
t REMOVE THE YELLOW CORD CONDUCTOR FROM TERMINAL 18 a
TAPE a CONNECT THE BALANCE LEAD CORD CONDUCTOR OF
THE LINE INVOLVED TO TERMINAL 18
t TERMINALS ON NETWORK
rABLE C OF FIG 4
PICKUP-SIGNALING CONVERSION
CONVERT KEY FROM LOCKING TO NON- LOCKING
OR
VICE VERSA (SEE
NOTE 303) a CONNECT S-BR
LEAD AS FOLLOWS.
I CONNECT 5-BR LEAD TO
4 PICKUP
KEYS
"'
3 PICKUP KEYS I SiGNALING
KEY I
SG
FIGURE 4
Arranged
Key and Telephone Circuit
for Cutoff, Exclusion Pickup,
Lamps and Signaling Holding,
1l

Station Apparatus
Key Telephone Sets arc combined telephone sets which include in a single housing the switching
keys, line
and busy lamps if desired, subscriber set apparatus, ringer and the additional cord conduc·
tors required for keys and lamps. Where more than one line terminates in a set the ringer may be
connected to any one of the lines, ringers in adjacent sets or externally mounted ringers being used
for the
balance of the lines. If desired, the set ringers may also be used as an audible signal common
to a group of lines. This feature is described in more detail on page 21 of this bulletin. The keys of
the set serve to switch the talking circuit to any one line. On sets having 4 or 6 button keys the keys
are equipped with a device that prohibits two keys from becoming locked when depressed simul·
taneously.
Common Equipment
When line and signaling equipment for an installation is required it is provided in the form of
Key Telephone Units
(K.T.U.). These are small panel type units approximately 7" high varying in
wtdth
from 2-Y.-:" to 91;.4" wide. Two rows of key telephone units can be mounted in an apparatus
cabinet consisting of a l6A Apparatus Mounting and a ll7A W Cover. The 200DW and 200EW Key
Telephone Units consist of such an apparatus cabinet equipped for 3 or 4 central office or PBX Lines
respectively
in which line, lamp flashing, incoming common signaling and incoming line lamp time out
circuits are assembled and wired. One lamp flashing and time out circuit will provide the requirements
for 5 line circuits when a wink signal is provided or 6 line circuits without wink.
If 6 lines with wink are required an additional 209A Unit must be installed. Other key telephone
units
may be added to the units provided in the 200DW and 200EW Key T~lephone Units depending
upon the operating features desired in a particular installation.
It is sometimes desirable to provide the apparatus cabinet separately to be equipped with indi-
vidual feature units. The following table lists the Key Telephone Units available for use with the
lAl Key Telephone System and indicates the number of each required per line, per station, per group
of lines, etc.
13