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BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 518-114-110
Issue 3, October 1972
REFERENCE
1 A 1 KEY TELEPHONE SYSTEM
KEY TELEPHONE UNITS
CONTENTS PAGE
1. GENERAL
2. IDENTIFICATION
201C KTU (Fuse Unit)
202A (MD), 202B (MD), 202C (MD)
and 202D KTUs (CO or P B X line
Circuit)
203A KTU (Automatic Tie line Circuit)
204A KTU ( Ringdown Tie line Circuit)
205A KTU (Station line Circuit)
207B (MD) and 207C KTU (Selector
Circuit)
208A KTU (Signaling Unit for Flashing
line lamps) . . . • . .
209A (MD) KTU (lamp F lashing and
Time-Out Circuit)
210A KTU (Wink Circuit)
211 A KTU (Intercom line Circuit,
Ringing lamp Circuit, Noise Suppression
Circ uit and Audible Signa l Control
2
2
2
3
3
3
3
3
3
3
4
Circuit) • . . . . . . 4
212 A (MD) KTU (CO or PBX line
Circuits with lamp Flashing and Incoming
Signals Time-Out Circuits) 4
227B KTU (Common Audible Control
Circuit).
228A KTU (Blank Unit)
4
4
CONTENTS PAGE
230A (MD) and 230B KTU (CO or
PBX line Circuits)
2 3 2 A ( M D ) a n d 2 3 2 B K T U
(Electro-Mechanical F lash, Wink, Ring
and Time-Out Circuit)
233A (MD) KTU (CO or PBX line
Circuits)
237B KTU (Bridging Circuit)
238A KTU (CO or PBX line Circuits)
239A KTU (CO or PBX line Circuits)
4
4
4
4
4
s
26B KTU (Automatic Cutoff Circuit) S
29A KTU (Cut Through Relay Circuit) s
30A KTU (Time-Out Circuit) s
Functional Schematics
Fig. 1-201C KTU (Fuse Unit) 5
Fig. 2-202A (MD) and 202B (MD)
KTU (CO or PBX line Circuit) 6
Fig. 3-202C (MD) and 230A (MD)
KTU (CO or PBX line Circuits) 7
Fig. 4-202D, 230B, 238A (line Circuit
Portion) and 239A KTUs (CO or PBX
line Circuits)
Fig. 5-203A KTU (Automatic Tie line
Circuit) • . • • • . • . . . .
8
9
@) American Telephone and Telegraph Company, 1972 Printed in U.S.A. Page 1
BSP 518-114-110-i03_1972-10-0l.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock.,c, C!-'-o,..lo,.,ra,._d"<o ..:O�c"'t -"13"'-"2 '-'0l,..2�17l.":4:'17 -":0"'S-------------
SECTION 518-114-110
CONTENTS PAGE
Fig. 6-204A KTU ( Ringdown Tie Line
Circuit) . . . . . . . . . . . 10
Fig. 7-205A KTU (Station Line Circuit)
1 1
Fig. 8-207B (MD) and 207C KTU
(Selector Circuit) . . . . . . . 12
Fig. 9-208A KTU (Signaling Unit for
Flashing Line Lamps) . . . . . . 13
Fig. 10-209A (MD) KTU (Lamp Flashing
and Time-Out Circuit) 14
Fig. 11-210A KTU ( Wink Circuit) 1 5
F i g . 12-211 A KTU (Intercom Line
Circuit, Ringing Lamp Circuit, Noise
Suppression Circuit and Audi ble Signal
Control Circuit) . . . . . . . . 1 6
Fig. 13-212A (MD) KTU (CO or PBX
Line Circuits with Lamp Flashing and
Incoming Signal Time-Out Circuits) 17
Fig. 14-232A (MD) and 232B KTU
(Electro-Mechanical Flash, Wink, Ring
and Time-Out Circuit)
Fig. 15-233A (MD) KTU (CO or PBX
Line Circuits)
Fig. 16-238A KTU (CO or PBX Line
1 9
2 0
Circuits) 22
Fig. 17-26B KTU ( Automatic C utoff
Circuit) and 29A KTU (C ut Through
Relay Circuit) . . . . . . . . 23
Fig. 18-30A KTU (Time-Out Circuit)
24
1. GENERAL
1.01 This section identifies the key telephone units (KTUs) used in the 1A1 Key Telephone
System. Functional schematics (Fig. 1 through 18 cover the basic circuitry of the KTUs and their relationship with associated apparatus. For additional information on the 1A1 Key Telephone System,
Page 2
refer to Section 518-1 14-105 for identification and arrangements and Section 518-114-425 for connections.
1.02 This section is reissued to:
• Revise KTU schematics
• Rearrange text.
1.03 This issue of the section is based on the following drawings:
SD-69203-01, Issue 7B
•SD-69288-01, Issue 18D•
If this section is to be used with equipment or apparatus reflecting later issues of the drawings, reference should be made to the SDs and CDs to determine the extent of the changes and the manner in which the section may be affected.
2. IDENTIFICATION
2.01 KTUs are individual circuit packages which provide switching and control functions and
are arranged for panel mounting in standard equipment cabinets or apparatus mountings.
2.02 The 1A1 Key Telephone System KTUs provide the following station service features:
• Holding on CO, Centrex, or PBX lines
• Visual and audible line signals
• Manual and dial intercom
• Cutoff, exclusion, and selective privacy
• Time-out
• Private lines.
201C KTU (Fuse Unit)
2.03 The 201C KTU (Fig. 1) is a fuse mounting unit arranged to mount seven No. 24-type
fuses.
BSP 518-114-110-i03_1972-10-02.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Oct 13,2012 17:47:23
202A (MD), 2028 (MD), 202C (MD), and 202D KTUs
(CO ar PBX Line Circuit)
2.04 These KTUs provide:
• Line pickup
• Hold feature
• The control of other KTUs for visual signaling
• Ringing options which include steady ringing, interrupted ringing, and relay control of a common audible signal.
2.05 The 202A and 202B KTUs (Fig. 2) are arranged for grounded ringing only.
2.06 The 202C (Fig. 3) and 202D KTUs (Fig. 4) are arranged for metallic or grounded ringing.
2.07 Ringing options are steady ringing, interrupted ringing, and relay control of a common
audible signal.
203A KTU ( Automatic Tie Line Circuit)
2.08 The 203A KTU (Fig. 5) is used on private (tie)Jines to provide:
• Automatic signaling to the called station
• The control of the KTUs for visual signaling
• Ringing options as shown in 2.07.
One 203A KTU is required at each end of the private line.
204 A KTU ( Ringdawn Tie Line Circuit)
2.09 The 204A KTU (Fig. 6) is used on private (tie) lines to provide:
• Manual signaling to the called station
• The control of the KTUs for visual signaling
• Ringing options as shown in 2.07.
One 204A KTU is required at each end of the private line.
ISS 3, SECTION 518-114-11 0
205A KTU (Station Line Circ uit)
2.10 The 205A KTU (Fig. 7) is used on private (tie) lines to provide:
• Manual signaling toward the distant station
• The control of other KTUs for visual signals
• Ringing options as shown in 2.07.
One 205A KTU is required to serve both the originating and terminating stations.
2078 (MD) and 207C KTU (Selector Circuit)
2.11 The 207B and 207C KTUs (Fig. 8) are the basic selector only intercom unit. The KTUs
provide:
• Station Selection
• Busy Lamp
• Audible Signaling.
Each 207B or 207C KTU can serve nine stations.
208A KTU (Signaling Unit for Flashing Line Lamps)
2.12 The 208A KTU (Fig. 9) is used on intercom lines to control:
• Flashing and busy lamp signals at the called station
• Time-out at the called station.
The 208A KTU serves three stations and is used in conjunction with the 207B or 207C KTU.
209A (MD) KTU (Lamp Flashing and Time-Out Circuit)
2.13 The 209A KTU (Fig. 10) is used on CO or PBX lines to provide:
• Interruption interval for flashing lamps
• Time-out of locked-in signals approximately 30 seconds after a call is abandoned.
The 209A KTU can serve five lines when wink option is provided and six lines when wink option is not provided.
Page 3
SECTION 5 18-1 14- 1 1 0
2 1 0A KTU (Wink Circuit)
2.14 The 210A KTU (Fig. 11) is used on CO or PBX lines to provide the interruption interval
for the wink option.
2 1 1 A KTU (In tercom Line Circ uit, Ringing Lamp
Circuit, Noise Suppression Circuit and Audible Signal
Control Circuit)
2.1 5 The 211A KTU (Fig. 12) is used on intercom lines to provide:
• Busy lamp (other signals must be provided separately)
• Protection against an overload of the ringing supply
• Noise suppression circuit
• Independent common audible control of two lines to the same station.
2 12A (MD) KTU (CO or PBX Line Circuits with Lamp
Flashing and Incoming Signal Time-Out Circuits)
2.1 6 The 212A KTU (Fig. 13) provides line pickup on three CO or PBX lines and common
equipment for up to six lines.
227B KTU (Common Audible Contro l Circuit)
2.17 The 227B KTU contains three relays which provide control for:
• Auxiliary lamp relay circuits
• Multisignals, ie, buzzers, bells, or ringers
• Common audible signals (CO, Centrex, or PBX line circuits).
2.18 Refer to Section 518-310-401 for additional information on the 227B KTU.
228A KTU (B lank Unit)
2.19 The 228A KTU is a blank unit with 40 screw type terminals. It is used for miscellaneous
purposes.
Page 4
230A (MD) and 230B KTU (CO or PBX Line Circuits)
2.20 The 230A KTU (Fig. 3) is the equivalent of five 202C line circuits, and the 230B KTU
(Fig. 4) is the equivalent of four 202D line circuits.
232A (MD) or 232B KTU (Electro-Mechanica l F lash,
Wink, Ring and Time-Out Circuit)
2.2 1 The 232A or 232B KTU (Fig. 14) plus the associated interrupter provides the following
timing features:
• Audible signals
• Lamp flash
• Lamp wink
• Busy tone
• Audible ringback
• Time-out on abandoned call
• Busy lamp control for manual intercom line.
233A (MD) KTU (CO or PBX Line Circuits)
2.22 The 233A KTU (Fig. 15) is the equivalent of ten 202C KTUs. Circuits terminate on
back of units in five KS-16671, List 1 plugs. A25B connector cables must be used for cabling to distributing frame or equivalent. Lamp fusing is provided on the unit.
237B KTU (Bridging Circ uit)
2.23 The 237B KTU provides an arrangement for bridging two PBX lines for conferencing
purposes under control of an exclusion or nonlocking key at a key telephone station.
2.24 Refer to Section 518-310-407 for additional information on the 237B KTU.
238A KTU (CO or PBX Line Circuits)
2.25 The 238A KTU (Fig. 16) is the equivalent of nine 202D (Fig. 4) KTUs. It also contains
circuitry to provide all the functions of the 232A or 232B KTUs (See 2.21).
239A KTU (CO or PBX Line Circuits)
2.26 The 239A KTU is the equivalent of eleven 202D (Fig. 4) KTUs. The 239A KTU is
arranged in line groups of 4-4-3 and each line group can be associated with its own time-out and auxiliary interrupter equipment.
268 KTU (Automatic Cutoff Circuit)
2.27 The 26B KTU (Fig. 17) disconnects cutoff stations from CO or PBX lines under control
of the 25B KTU. One 26B KTU will serve five cutoff stations.
29A KTU (Cut Through Relay Circuit)
2.28 The 29A KTU (Fig. 17) is used to provide manual cutoff on CO or PBX lines.
30A KTU (Time-Out Circuit)
2.29 The 30A KTU (Fig. 18) provides system time-out on abandoned calls. The KTU will
time-out approximately 20 seconds after the call is abandoned.
TO LINE
AND S I G
CKTS
ISS 3, SECTION 518-114-110
�*� �*� �*� �* � �* � �* � �*�
GRD
!:. GRD
GRD
GRD
GRD 18 GRD
GRD 19
GRD 20
GRD
TO
POWER
SUPPLY
* 24-TVP( fUSES ARE NOT fURNISHED WITH THE KTU.
THEY MUST 8( PROII I OED LOCALLY.
Fig. 1--*Functional Schematic of 201C KTU (Fuse
Unit).
Page 5
SECTION 518-114-110
CO OR [ T PBX ll NE
R
I (311
2 (321
A
,- ,�, H 'm
2B 3 4B I : ... I KS- 13490, L3 :.
TO RINGER OR
TO 211A KTU
BUZZER OR [RI, BZ OR COMMON AUDIBLE SIGNAL CONTROL Bl CIRCUIT .=--
TO AUD ST SIGNAL CONT
l CA 32 [7]
3:;[e] �
J. OR GRO �] �
[20) � 38[29] 00 TO [ B B A T.
POWER SUPPLY _B_G_ R_o ______ 40[30] 00
68ll ..-
* .. I• "" B
G D
� Rl �� -el I (361 B R
2T
Rr:T
2T
I
2T
A I
9 (II
H II (21
A
R TO KEY AND TEL CIRCUIT
� 'if--H B 15 (61 AI
5
3 3 H
4T
B •I�
17 (41 L
19 (51 LG •I� C 30 (401 LG
A 3l),;;l t OR B AT. J 6B 26 (181 ,..,;.., LB
J R 2Sli'11 LF ;.-,;..,.. 4B
26Q 2l (91
LA�P SUPPLY
TO 209A OR 212A KTU
2 1 e � (10) z
r--r L\1 LB
REMOVE Z STRAP AND R UN R ED
LEADS TO 210A KTU FO \liNK CIRCUIT \IHEN US
4 [34] � � 3,.£;,31 � 2�] � �J 7!3s l ,..,;.;,
"'J Tl
R
T
H I K
TO 209A OR 212A KTU
OIA OR IOIB EY EQUIP IF
24 1'381 p ,..,;.., LK
B 'iH---o-�c....,,.--2�2(/X;(
2�8_1 ___ _:::::::....] ;;· ;,;
..... --l*"-----{?f}�---...:.::::.... KTU
L..��=--{��---�T�O-
Fig. 2--*Functiona l Schematic of 202A (MD) and 2028 (MD) KTU (CO or PBX Line Circuit).
Page 6
7:48:45
ISS 3, SECTION 5 18- 1 14- 1 10
T 7 � .... I OR PBX
R 8
� 4
IAH I 5
� AH
'1-
A 10
8 H
II I
R 10
AH A 15 5 L 13�] � LB TO LAMP SUPPLY
� " ] TO 210A, 232 TYPE,
� Lr 238A KTU � T C\
f ��r---n1R 4
R ..---.>:��o----2
-
LK
TO AUO t (NOH)
TO 51 G
17
'(V AH ;;_ CO
211A �)-0-----------4�-----.._ ____ ...J 1 � TO 209A, 212A, 232 TYPE, OR 238A
KTU
NOH: rOR THE 230A KTU THE rDLLOWING APPLIES CKT I TERMINALS ON TSA CKT 2 TERMINALS ON TSB CKT 3 TERMINALS ON TSC CKT 4 TERMINALS ON TSO
INTERNAL STRAPS ON 230A KTU TERMINATED ON TERM. STRIP A ONLY,
H 21 HA •IH-----:�-::f-<�0-----"::.._
R
4 R 23 TO
lOlA OR B KEY [QUIP. lr PROV I OED
g tOR BAT. OR G�: RINGER]
tO Rl OR BZ ORCA
OR BUZZER TO AUO OR COM
AUD SIG. S I G SUP
25 RG CONT CKT
28 81 OR BZI
•I� 8 27 B GRO J 26
B BAT DC POWER SUP
-20V �
Fig. �Functional Schematic of 202C (MD) and 230A (MD) KTU (CO or PBX Line Circuits).
Page 7
Revised August 1974
BSP 518-114-110-i03_1972-10-07.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock.,_, C�o_,. Jo.,r"a"'do"---'O�c"'t -"1""3'-'2"'0'"1�2 �1"7�:4'-'9"':0'0:4!.---------------
SECTION 518-114-110
T 7
I (NOTE 3)
CO OR PBX LINE
NOTES:
R 8
17
317S, �
AH 4
�
H 8 c:?H
'12
A
A 9
R a · l�
\D f � I MP BATTERY ON 2020, OR 2308 CKT I AND 2 USE I. FOR LA
TERM. 2 9. ON 2308 CKT 3 AND 4 USE TERM 28.
2. IN TERNAL STRAPS ON 2308 KTU TERMINATED ON TERM
STRIP A ONLY.
3. TERMINALS SHOWN ARE FOR THE 2020 KTU (T YPICAL).
REFER TO THE APPROPRIATE CONNECTION SECTION FOR
TERMINAL NUMBERS FOR OTHER KTUS INVOLVED.
4. STRAP BETWEEN TERMINALS 20 AND 29 IS FOR
STEADY HOLD LAMP AS REQUIRED.
R 4 I
I I I T
(NOTE 3)
12 2 R
8 A 1 3 3 A
•I HI I� 1 4 4 AI •lf-----0---0---
AH 1A )...5 5 L 2 8 ��� LG
LGJ
� tORBAT
: (NOTE 4)
::Y "] R
19 Lr 10
� AH 22 LK
5 'V AH 2 4 co
l
I
B H � HA •I 4 +--(NOTE 2 )
R � TO
8 'V
TO KEY TEL SET
TO LAMP SUPPLY I NOTE I)
T O 210A, 232
TYPE , 238A KTU
10 2 09A,2 12A, 232 TYPE OR
238A
TO lOlA OR B KEY EQUIP. lr PROV I OED
R�l �� TO AUO
Sl G SUP
2� RG
TO RINGER OR BUZZER
OR COM AUO SIG
CONT CKT 81 OR BZI
��] 26 DC POWER SUP
-20V � Fig. 44Functional Schematic of 2020, 2308, 238A (Line Circuit Portion) and 239A KTUs (CO or PBX Line
Circuits).
Page 8
Revised August 1974
TO Dl STANT STATION OR SIMILAR T IE-LINE CIRCUIT AT DISTANT KEY TELEPHONE SYSTEM
OPTIONS'
TB co • 11---::---7�-:-11-------l B 4T
TB Ll
co f-=-t-----1f--l 2T
I � 8
3T 2T
@) STEADY C0/440N AUDIBLE SIGNAL USING COMMON AUDIBLE SIGNAL CONTROL CIRCUIT (21/A OR 1 6A KTU). @ INTERRUPTED AUDIBLE SIGNAL OR C01440N AUDIBLE SIGNAL USING ELECTROMECHANICAL INTERRUPTER (2328 OR 238A KTU). 0 STEADY AUDIBLE SIGNAL OR COMMON AUDIBLE SIGNAL. @ INTERRUPTED CCH40N AUOIBLE SIGNAL USING RELAY CONTROL CIRCUIT (227A AND 2328 OR 238A KTU).
I•HI• A TB
II 11
ISS 3, SECTION 518-114-110
TO TEL SET
� �J TO LAMF 31 POWER t OR LB SUPPLY 26
TO 209 A, 5T TB 22 CO 212A, 232A OR �: j 1 ;�28 ��------=
T
::::
O
_ B,OR 238A
B; 28 I 32
f---
@
-
z
--
--'"'-
,------0--< CA I TO 2278 KTU
Ll 2T
@� R OR R l ] TO AUD S/G 33 �8 OR 8/ OR SIG OR � COMMON AUD 0----< 0 8 OR 81 SIG
37 0t GRO OR RG
J TO AUO t,BAT., SIGNAL POWER OR 105Vt SUPPLY
L....----(/36�_0-<y l0 RN TO 232A OR 8, OR 238A KTU @t 8 y,.
:::.:j ·::·:::" l ;��:-;�p��� a,,�
23 R
L l +4
3
8 ; ] TO COM AUO @) S/G CONT CKT 27 ______ .:.:R:..:...R (21 /A OR
'-"-----· � 1 6A KTU)
Fig. �Functional Schematic of 203A KTU (Automatic Tie Line Cir cuit).
Page 9
BSP 518-114-110-i03_1972-10-09.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock.,_, �co_,l.,o"ra..,d.,o�Occc<..t "13"'--' 2"-0"'1�2�1"7eo: 4""9"': :;o4 �1----------------
SECTION S18-114-110
TO SIMILAR TIE LINE CKT AT DISTANT KEY TEL SYSTEM OR KEY EQUIP
TO AUD SIG SUPPLY
T
R [ RG IOSV t
I �
2 �
,§.. 5
�
RO 5 6T
4 )� RO RO I I
RO 2 38 I
R Rl '1H1I I
'" t.. " Rl 6
OPTIONS @)STEADY COM�N AUDIBLE SIGNAL USING
COMMON AUDIBLE SIGNAL CONTROL CKT (211A OR 16A KTU).
® INTERRUPTED AUDIBLE SIGNAL OR CO�N AUDIBLE SIGNAL USING ELECTROMECHANICAL INTERRUPTER ( 2328 OR 238A KTU).
@STEADY AUDIBLE SIGNAL OR COMMON AUDIBLE SIGNAL.
TB 9 T
R 6R ,, 6T 'bib rc� ..
8 'I TB
2T I 8 'I
TB A I' 11�1, TO
" � 1/ TB 4 II R
TEL SET
Rl
I
RO
" 48 3
tT 3 TB
3
48
TB I 26
Rl 28
� ).! � ).! � 26
vftli il � 24
21
� � � � 31
�
LG
L
L6
Lr
co
LK
TO
GRD
tOR LB
TO 209A, 212A, 232A OR 6, OR 238A
] TO LAMP POWER SUPPLY
� 'Vi' RR ] TO 211 A &>-------< •-\.!!J ___
_ R_ KTU
A IS "A" BAT. ,1�11 �
16 "A" GRO TO 14-26V DC POWER
'IHII� SUPPLY
'I 8 40 B GRD
@INTERRUPTED COMMON AUDIBLE SIGNAL USING RELAY CONTROL CKT (227A AND 2326 OR 238A KTU).
6 � 7 13 'li-=-------jll f---------<0----0�------=- TO SIGNAL
KEY
Page 10
Rl
,--
--
--{'
3
�
2---
-<
•-'@:..._ _
_ C_ A_I_ TO 2276
2T
37
36
t KTU
@!L _ _ _ _
::: :: j ��GA��
COM AUD B OR Bl SIGNAL
:�DB:. �
G J !!�:� OR IOSV 1 SUPPLY
® RN 232A OR 8, OR 238A
Fig. �Functional Schematic of 204A KTU (Ringdown Tie Line Circuit).
7:50:00
[ RO
5 6T TO DISTANT STATION
RO 2 3B
[ RING GRD TO AUD SIG SUP lOS±
2 Uf
co I�� 3B
Ll
11�1•
TB B
•IHI I I l3 4B Ll
I 2B
19 ,.,. 17
Ll 25 5T •
�6
,/ 22
� � �
ISS 3, SECTION 518-114-110
II
tOR
�
LG
L
Lf
LB
co
TO
LB
GRD
TO TEL SET
209A, 210A, 232 TYPE, OR
238A KTU
}· ""' �· ""'. RO 13 s J
f------------0---0---- TO S IG KEY
OPTIONS:
LI� �] T0 211A KTU
��
• l� l(�l •IHI(� TO 14-26V
B 38 "B" BAT DC p� SUP. •IHII I-----0-----
B 40 "B" GRO • 1 1------'<:>--------
,..---{302 __ < ® CA I J TQ 227B KTU
@) STEADY COMMON AUDIBLE SIGNAL USING COMMON AUDIBLE SIGNAL CONTROL @�] C33
�
TO AUD SIG OR CKT(211A OR 16A KTU). @ INTERRUPTED AUDIBLE SIGNAL OR COMMON AUDIBLE SIGNAL USING
r:;.., ELECTROMECHANICAL INTERRUPTER (232B OR 238A KTU). 1..!.1 STEADY AUDIBLE SIGNAL OR COMMON AUDIBLE SIGNAL. ® INTERRUPTED COMMON AUDIBLE SIGNAL USING RELAY CONTROL CKT
(227A AND 232B OR 23BA KTU).
Ll 2T @ COM AUD SIG ® �
TO AUD SIG t, BAT., POWER SUPPLY OR IOSV:t
G) t GRD OR RG1 36 °f0-:-J TO 23 2TYPE,
c._---0--< � OR 238A KTU
®L� Fig. 74Functional Schematic of 205A KTU (Station line Circuit).
7:50:30
Page 11
Revised August 1974
SECTION 518-114-110
TO 208A KTU TO 208A KTU TO AUDIBLE S IG TO AUDIBLE S IG
·�� �·· nL�: irJ·· � S[L � S[L
ARC I
166
A BAT ._-2_o __ �9�e _______ _J 156
336
256 C B I NOTE II 0----,8;:-,)�(;---111•
TO 209A, co 56 B B OR �I• 212A KTU 6
BB
TO 20BA D OR L 36 KTU OR STA. B
TO LAMP [ SUPPLY B
LG TO STA
B
A
RLS O.N. A
I I I NET .
ROT
c
�--...------+'--1 B T 10 A
�a c
B B
A �. +
(NOTE 3)
!NOTE 3)
ARC 2
T
c
T
c B 3 96
66 366
1 t
± OR 105±V
AUO SIGNAL POWER SUPPLY
196 B BAT. •IH•Io----0------J TO PWR
ZOB SUPPLYo •I� INOTE3)
NOTES :
356
�,__e ---'7+ B
I • THC 2076 KTU IS NOT EQU I PPED WITH GROUND OR A STRAP FROM C RELAY TO TERM. 256.
2. REMOVE STRAP IF MORE THAN 9 STATIONS ARE SERVED.
3. PROPER POLARITY MUST BE OBSERVED WHEN M"'ii<'i'N'G POWER CONNECTIONS TO THE KTU. REVERSED POLARITY MAY CAUSE DAMAGE TO THE ELECTROLYTIC CAPACITOR.
Fig. �Functional Schematic of 2078 (MD) and 207C KTU (Selector Circuit).
Page 12
Revised August 1974
/ T
TO 207A, B OR C KTU
c
A
R
D
TO 209A OR 212A KTU [" TO
LB
TO LAMP [ POWER SUPPLY
LB
LG
12
21
: ;.,.
J �
13
1 5 "-'
� "-' � LS "-' 4
I:: 29
L
4 5T
1 L
j 0 \? 4B 3 L
L 2B I
LS 28 I
L
3 4B
::BT
LS
'*' B
5T ,,
RErERENCE PUNCH lNG DESIGNATION CKT I CKT 2
A (TIP)
8 (RING)
c (L) 33 34 D (A)
E (C) 18 19
F IB BAT.) 22 23 G (LG) 30 31
B II•
B jll------11• B
I • l------11·
B •I 36 37
CKT 3
10
35 II
20
24 32
ISS 3, SECTION 518-114-110
A T
14 H TO 207A, e--------::-- B OR C
KTU D A
�
8 R
c L "-' J,. LG "-' � AI � 39 B BAT.
38 B GRD �
TO TEL SET
] TO PO\I£R SUPPLY
Fig. 9-Functional Schematic of 208A (MD) KTU (Signaling Unit for Flashing Line Lamps)
Page 13
SECTION S18-114-110
FB f:T
FB t:T
FB tT
FB f �B
FB t !a
22A �A
24A �A
26A
iA
28A �A
30A
iA
LB ] TO 1ST LINE Lr TO 202 A,B,C OR O
OR 230 A OR B KTU LB
J TO 2ND L1 NE LF" TO 202 A,B,C OR 0 OR 230 A OR B KTU
LB
J TO 3RD L1 NE Lr TO 202 A,B,C OR D
OR 230 A OR B KTU
LB Lr TO 202 A,B,C OR D J TO 4TH LINE
OR 230 A OR 6 KTU
LB ] TO 5TH LINE TO Lr 202 A, B, C OR D
OR 230A OR 6 KTU
•1�,,� TO 202 A,B,C OR D
6 TO 16A OR 230 A OR B KTU •I f-----i ,,, � HA
co co
33A TO 207 8 OR C KTU
PF f�T 3� Tl J" '" ""
34A TO 202 A OR 6 KTU PF f�e 3� Rl
36A
PF f:a 4� Rl TO 2ND L1 NE
37A TO 202 A OR B KTU
PF f:r 3� T I
16
PF -f :T � T I
26 TO 3RD Ll NE
PF -f:a � TO 202 A OR 6 KTU
R I 56
PF -E:T � Tl
66 l" "" "
"
PF {:a � TO 202 A OR 6 KTU
Rl
96
PF -f�T �6 Tl lOB l· ""''" PF -f �oe I� TO 202 A OR 6 KTU
Rl
138
PF -f:�T I; Tl
146 ] " "" ""' PF -t:�a I; TO 202 A OR 6 KTU
R I
B 188 B BAT] TO •IH'i POWER ZOB 8 GRO SUPPLY •I�
FA B � B •I /lf------'1• 7 BT
PF B �TO B •I /lf----"11• 4T 3
Fig. 1()4Functiona l Schematic of 209A (MD) KTU (lamp Flashing and Time-Out Circuit).
Page 14
ISS 3, SECTION 518-114-110
II
66 w
13
14
I
W +L;:_e ____ _ � 3
: W �'-t_e ____ _,
5
� 7
W �L;_T ____ _ � 9
� w
�
"
;
_T
____ _
w
H A
TO
LW
LB
LW
LB
LW
LB
LW
LB
LW
LB
TO 20 9A OR 2 12A KTU
] TO 20 9A, 212A, 202A, B,C, OR 0, OR 230 A OR B KTU
J LINE I TO 20 2A,B, C, OR 0, OR 230 A OR B KTU
]LINE 2 TO 202A,B, C, OR 0 OR 230 A OR B KTU
]LINE3 T0 202A,B, C, OR 0 OR 230 A OR B KTU
]LINE 4 TO 20 2A,B, C, OR 0 OR 230 A OR B KTU
]LINE 5 TO 20 2A,B, C, OR 0 OR 230 A OR B KTU 18 l
•IHti� To
ZO POWER •I B B GRD SUPPLy
Fig. 11 ..... Functional Schematic of 210A KTU (Wink Circuit).
7:51:49
Page 15
SECTION 518-114-110
Page 16
Bf � 4 T
BF 3
+: R I
23 ;:;_ T � �4 R �
� L
3BF 48 � co
-!- �
B 35 LB
30 LG 0 � "A" BAT �
38 "A" GRD
37 "8" GRO
�
ST
TO TE L AND S I
LA�
STA PICKUP KEY G LA�PS
TO 209A OR 212A
SUP PLY
TO 238A, 230A OR B, 202C OR 0, OR 239A,
OR 233A KTU
8 R
Rl �] TO 203A, 20 4A, � OR205AKTU
14 IOSVt J TO 202A, 2028 OR 212A KTU
& RG
l POWER SUPPLY FOR AUO SIGNAL
Fig. 12--*Functianal Schematic af 211A KTU (Intercom
Line Circuit, Ringing Lamp Ci rcuit , Noise
S upp ression C i rc uit and A udible Signal
Cont rol Circuit).
BSP 518-114-110-i03_1972-10-16.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Oct 13,2012 17:52:09
TO 211 A ------7 KTU 1
TO lOlA OR 1018 KEY [QU I P If PROV IDEO
�.
• •I
ST
A 2T
H I
A
TO OTHER CO OR PBX LINE CKTS
28
H 2T
2T PF
PF
R
A B � • t l--t l·� B 6A 16A 26A AI •lt--------0--0-0 B 5A 15A 25A LG •lt--------0--0-0
A •• 5
LB -
H 1 --REMOVE Z Z STRAP AND
LW RUN U:ADS +--:,:*4,-,:T,--<2)--< «E---- TO WI NK CKT WHEN
R USED 48 LF
A 5 6T
R I 28 �:: } ------, :;, � ;;:'[ �: :; J:: +--::*=--e<:-\---:-:1-'
: ��
N
:.:·:ENT · [ LF' 1 1 "-;*co;;--"'----"::_
I ���;c�� PBX LB 2T t FB
Tl 39C
PF -�]T06TH �CLINE
�CJTOSTH PF � LINE
.�CJT0 4TH PF� LINE
TO 202 A OR B KTUS
Tl p f + G5T OFT. OR PBX J TO 3RD CENT. L--=----'-- ll NE CKT
+4T J TO 2ND CENT, PF 3 orr. OR PBX
LINE CKT
Tl
e PF TO e •11-<1•�1·
R
J
TO 2ND CENT. OfT .OR PBX
LINE CKT
PF t !a Rl OFF. OR PBX J
TO 3RO CENT.
L-=--- LINE CKT
R IBC
PF�c] TO 4TH � LINE R 2B
C
6 FB FA 37A z 27 •11-< l•� - >-0 �OVEZSTRAP
AND RUN LEADS TO WINK CKT WHEN USED
LB 188
FB � JT04TH �LINE
LB 288 TO FB �8
J TO 5TH 202 � LIN( A OR B
�]T0 6TH FB� LINE
KTUS
PF �c]TO STH � LINE TO 202 A OR B KTUS
"8" BAT. 29A 8 14-26V [-'-----0---<I•HI•
L------------� 3BC
PF�c ]To 6TH � LINE DC NR SUP GRD 3�1, B
[--'±'-'I-'-OV'-------<30A
LAMP F'W SUP _G_R_:.D
_____ 4-00A
BAT.,±, 105t., GRO 19A
AUD SIG PWR [ 0 SUP OR GRD GRD OR R GRD 28;-
B OR 81 SA OR VIS AND AUD SIG R Rl CAl 7A
REfERENCE DES !GNAT I ON
A • c D E r G
PUNCH INC CKT I CKT 2
IA,I IA,21A 18,118,218 2A, 12A,22A 28,128,228 3A,13A,23A 38,138,238 4A,I4A,24A 48,148,248
31A 318 32A 328 7A 7B
CKT 3 IC,IIC,21C 2C,I2C,22C 3C,I3C,23C 4C,I4C,24C
31C 32C 7C
I I I I I I L ___ _ -
LKI
HAl
COl
•
208 LK
• TO 196 HA •I HI 1]1 T�co
I ]., TO ('!7A TO
T c L 0 OTHER 0 OR PBX INE CKT R WINK KT AS EQ'O
0 c R TO COMMON AUD S I G [
CKT OR STA LINE �· ' CONCR CKT
4T R TO AUD S IC 194 3 PWR SUP
H J K
lOA lOB IOC 3SA 358 35C 36A 366 36C
•IH•I I 2T �IH•I r>r �6
0
2 I RE TOI � 2078 OR
KJ� AS
Fig. !�Functional Schematic of 212A (MD) KTU (CO or PBX Line Circuits with Lamp Flashing and Incoming Signal Time-Out Circuits).
BSP 518·114·110·i03 1972·10·17.jp Scanned by Frank Harrell, (Cowboy Frank Castle Rock, Colorado Oct 13,2012 17:52:29
u; "' � "' m !l 0 z
r-----'2:.:3::..2-.!_Y� .::KT:_:U:._t'-----, TO POWER SUPPLY [ �:� AC @ 2:6 2T I roR MOTOR ....::::.:....=--==-�>-1-{'f=-----...--'�-.--<
24V DC � j ST [ R ,..,_4 0 8� A 2B TO MANUAL T 30 � � -··
V
-'-------+0':::_-li_H H11 · ST I NTERCOM P I CKUP l 28 A
R, Rl, OR RN ::;:21 '------<
R, RI, OR RN R. R l , OR RN
TO AUD SIG B OR 81 BF 8 O R 81 8 OR Bl
B OR Bl
TO CKT REG AUO TONE OR KTS NO SA
Y [ R I NG GRD
TO AUD 5 I G SUPPL BAT· .t OR 105V ATI OR RO
29 �
34 �
,, �
32
AT
BTl OR BZI TO AUD TONE SUPPLY,CONT CKT OR GRD --""-------f"�:._l----------(
TO CKT REG BUSY TONE
TO BUSY TONE SUPPLY OR CONT CKT BT OR BZ �
,
lf OR Ll I
ISS 3, SECTION 518-114-11 0
I NTERRUP_T-' E�R-
*------, ;c=-- 1
(INTERRUPTER IS NOT FURNISHED AS PART OF 232-T YPE KTU)
2
I I
: f :
+6
TO 202A,B,C,OR 0,203A,204A, 205A.230A OR 8,233A,OR
lf OR l l I 2/ lf OR ll 3
rV Lf OR L l I 11
0 8 ,------< 1 1 7 I •
���---����----+------< 13 I 239A KTU {SEE NOTE l
TO 202A,B,C.OR 0 , 230A OR 8,
233A OR 239A KTU (SEE NOTE)
TO LAMP SUPPLY OR GRD
TO 30A KTU
lf OR L1
lf OR L1 I Lf OR I lf OR ll I LW OR L 1 LW O R l l I LW OR L 1 L W O R L l I LW OR L l L W O R L 1 l LWOR L I LW OR l l I
["""-:tLB OR GRD
tLB OR GRD :tlB OR GRO HAl
nc5 •.) 7
nV I I
,.B) '""" � ,-,1 5 ,..,�
17
,-, I �
� 1 0
�19
20
I
ST
1 6 8 " 5 1 9
*
MAX. 36 LAMPS PER LEAD BUT NOT TO EXCEED 50 LAMPS PER PAIR.
LEGEND
CONTACTS SHOWN IN STARTING POS I T ION.
T O 211 A KTU ® A35
A STI ?::::::"f_}' -24V
(� � I ®
ON 232A KTU, ST AND TO BATTERY CONNECTIONS TERMINATE ON TERMINAL 39. ON 232B KTU, TERMINAL 39 MAY BE USED TO TERMINATE THE AUDIBLE SIGNAL SUPPLY GROUND AND 8 OR Bl LEAD S.
TO 202C OR 0, 230A OR 8 233A, 239A , 203A,204 A, OR 205A KTU
[ �; G) 4 0 0A >-1}36 112Q 3T I ®
LK n.3B 1;,· U TO G) co 37n � r· A -••v 1 0 -24V BAT. ( A ) r 2NJT0 :':J @ GRO (A ) I �25 &---<VI· )(
4 I I • ®
@A. 39 I@ BF G) -
FOR USE WHEN ONLY THE INTERRUPTER CKT IS TO BE PROV I DED. WITH OUT AUX Tl ME- OUT CKT,
WITH AUX TIME -OUT CKT. KS-15900, L 2 INTERRUPTER. KS-19384, Ll (MD) INTERRUPTER
KS- 19384, L2 INTERRUPTER.
WITH MORE THAN ONE SYSTEM WITH T I ME- OUT.
@ 2328 KTU @) 232C KTU
Fig. 144Functional Schematic of 232-Type KTU (Electro-Mechanical Flash, Wink, Ring and Time-Out
Circuit).
BSP 518-114-110-i03_1972-10-19.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Oct 13,2012 17:53:09
Page 19
Revised August 1974
SECTION 518-114-110
A 36 OR 47
II OR 22
AH
MODifl ED
R RELAY CONTACTS (SEE NOH 4)
NOTES: I. TERMINALS I TO I I ANO 26 TO 36 ARE FOR ODD
NUMBERED CIRCUITS. TERMINALS 12 TO 22 AND 37 TO 41 ARE FOR EVEN NUMBERED CIRCUITS.
2. TH( POWER SUPPLY LEADS AND THE LEADS TO THE CENTRAL OFF" ICE OR PBX LINE ARE CONNECTfD TO THE TERMINALS OF" THE PLUG AS SHOWN BELOW:
CIRCUIT S LEAD
1-3-5-7-9 2-4-6-8-10
T CO OR PBX
36 47
R II 22
GRO LAMP SUPPLY
.t OR BAT. 9 20
BAT. GRO 35 46 SUPPLY -20 10 21
KS-16672, U PLUG
H (NOTE I)
-20 2 OR 13 I I
-20 II A I I
AH I I I I I
T I 26 OR 37
H I OR 12
H HA I 5 OR 16
I LB± 1 9 OR 20
A 12 AH
L I 3 OR 14 LW I
29 OR 40 I 10 I
R; Lf I 4 OR 15 R R A
LK I 31 OR 42 I
I I ST I
33 OR 44 A I
-20 ----""" 0 A: ( 27 OR 38
AH co I 30 OR 41
I R I
TO I 6 OR 17
RN I i � 32 OR 43
RII
7 0R I8
B BAT I -20 �·�-----��� B GRD I
3. EACH PLUG PROVIDES LEADS FOR TWO LINE CIRCUITS WHICH ARE ARRANGED ACCORDING TO THE fOLLOWING TABLE:
PLUG
A I B I c I o I E
ODD CIRCUITS I I 3 I 5 I 1 I 9 EVEN CIRCUITS 2 I • I 6 I 8 I 10
4, FOR NON LOCKING DPERAT I ON OF" R RELAY, MOVE THE UPPER WIRE SPRING CONTACT FROM ITS GUIDE IN CONTACT POSITION 4 TO THE LOWER GUIDE Of CONTACT POSITION 5. MOVE THE LOWER WIRE SPRING CONTACT fROM ITS GUIDE IN CONTACT POSIT I ON 4 TO THE UPPER GUIDE Of CONTACT 3. CONTACT POSITIONS 3 Aff:l 5 ARE UNEQUIPPED AND THE STATIONARY CONTACTS UNW I REO.
10 OR 21
35 OR 46
fig. 154Functional Schematic of 233A (MD) KTU (CO or PBX Line Circuits) (Sheet 1 ).
Page 20
Reissued August 1974
17:53:27
ISS 3, SECTION S 18-1 14- 1 10
TERMINAL BLOCKS LEAD I KS- 16672 , A258 CONNECTOR CABLE OESIG �� P
KL�
UG l ��(;�g��0·J 2 5 PR I W CABLE OR OTHER TYPES OF l TO lOlA OR 1018
KEY EQUI PMENT DISTRIBUTING FACILITIES H I I IBL-W) [BLJ (SEE NOTE 4 }
R T 26 26 (W-BLI [ W ]
2 2 (OR-WI [OR J H 27 27 (W-OR) [ W ] A I 3 I 3 I IGN-Wl [ GN ] I L 28 28 (W-GNI (Wl SPARE I
4 I 4 I IBR-WI ( B R J I LF LW 29 29 (W-BR) ( W ) HA 5 5 (5-W) (S l co 30 30 (W-5} [WJ TO 6 6 (BL-Rl CBL J
LK " " I R - BL) [ R J 7 7 tOR-R) [ORJ Rl
@) I I I I (!) I I I I
ODD ( I RCUI TS
I 32 I 32 I ( R - OR) [ R J I I r-
EVEN C I RCU I T s
RN SPARE
ST L B ±
SPARE 8 BAT 8 GRO
R T
R T H A
L SPARE
L F LW HA co TO LK Rl
I 8 I I 33 I 9
I 34 I 10 3 5 I I 36
I 1 2 I 37 " 38
I I 1 4
I 39 I 1 5 40 16
4 1 1 7
4 2 1 8
I I I I
8 I (GN-Rl [GN] I�!� 33 I (R-GNJ [ R J 9 IBR-Rl [BR] I �.
3 4 I (R-BRI ( Rl I J0 1 0 (S-RI [ S J 35 (R-Sl [ R ] I I (BL BK) [BLJ
36 (BK - B L J [ B K )
1 2 I (OR-BK) [OR] I 37 (BK-OR) [BK J " (GN-BK) [ GN ) 38 ( BK-GN) [ BK ]
I 14 ( BR-BK) [ BR ] I 39 I ( B K - BR) ( BK ] I 1 5 (5- BK) ( S ] 4 0 ( BK-5) [ BK ] 1 6 (BL-Yl [BL] 41 ( Y - BL) [ Y ] 1 7 (OR - Y ) (OR) 42 (Y-OR) [ Y ] 1 8 (GR-Y) [ GR )
@) I I (!) I I I I I I rt-RN 43 43 (Y-GR) ( Y ]
SPARE I 1 9 I 1 9 I (BR-Yl (BR J l�i ® 44 44 (Y-BR) [Y] ST I I I I � 20 20 ( 5 - Y ) (S] LB± SPARE I 45 I 45 I ( Y - S l [ Y J I J0 2 1 2 1 ( BL - V ) ( B L l B BAT 46 46 (V-BL) [VJ B GRO
22 22 (OR-Vl (OR J R 47 47 (V-OR) ( V ] T 23 23 {GN-Vl [GNJ SPARE I 48 I 48 I (V-GNl [V] I SPARE I 24 I 24 I (BR-Vl r••Li SPARE I 49 I 49 I ( V - BR) SPARE [ V J
SPARE I 25 I 25 I (S-V) (S l I 50 50 ( V - S ) [ V) SPARE
NOTES: I . Lr LEADS MAY BE STRAPPED NOT TO EXCEED 50 LAMPS PER GROUP. 2. LW LEADS MAY BE STRAPPED NOT TO EXCEED SO LAMPS PER GROUP. 3. fOR COMMON AUDIBLE S I GNAL WITH Z OR Y O P T I O N , STRAP All Rl LEADS. 4. THE TYPE Or TERMI NATING EQUIPMENT TO BE USED • SUCH AS 30- OR 66-
TYPE CONNECTING BLOC K S , BUNCH BLOCKS , DISTR I BUT I ON fRAM E . ETC, W i l l BE GOVERNED BY THE SIZE AND NEEDS Of" A PARTICULAR I NSTALLAT I O
l CURRENT COLOR CODE C J MD COLOR CODE
Ll NE R I NG I NG C I RCU I T
N. COMMON AUDIBLE
I ®, (v) (!)+
I ®, (v) (!)�
METALL I C
GROUNDED
R T
A A I L
LG L F LW HA co TO LK Rl 81 : GRO
: :!::. , BAT.1 OR 105V!
RN
I CA OR CA l ST
LB t GRD
8 BAT 8 GRO
R T
I H R T
A AI L
LG L F LW HA co TO L K R l 8 1 : GRD
: t 1 8AT.1 OR IOSV +
RN
I CA OR CAl ST
L B + GRD
8 BAT B GRO
R T
I I I I I I C I RCU I T NOTES
J( R
T
:M::: :::D�AMP)
PICKUP KEYS
l TO 232A OR 8 KTU {NOTES I AND 2)
J T O COM AUD SIGNAL ( NOTE 3)
J TO AUD SIG POWER SUPPLY TO 232A OR 8 KTU TO 2278 KTU TO 2 1 1 A KTU
J TO LAMP SUPPLY
) TO BAT. SUPPLY
) TO CO OR PBX LINE CKT J��y������J�I� TO TEL SET O R PICKUP KEYS
l TO 232A OR B KTU (NOTES I AND 2 )
J TO COM AUO SIGNAL (NOTE 3 I
J TO AUD SIG POWER SUPPLY TO 232A OR B KTU T O 2278 KTU TO 2 1 1 A KTU
J TO LAMP SUPPLY
J TO BAT. SUPPLY
J TO CO OR PBX LINE CKT
fEATURE OR OPTION APP OR W I R X
v _I COM AUO CONTROL RELAY PROVIDED w
I NTERRUPTED I I N TERRUPTER y R I NG I NG I COM AUD CONTROL
RELAY PROVIDED T STEADY R I NGING z
Fig- 1 54Functional Schematic of 233A (MD ) KTU (CO or PBX Line Circuits) (Sheet 2).
Page 2 1
7:53:47
SECTION S l S-114-110
TO PO\t'ER SUPPL FOR MOTOR y IOV ±
l GRD
TO CKT REG AUO TONE OR KTS 6A TO AUO TONE SUPPLY ,CONT CKT OR GRD
TO CKT REG BUSY TONE
A T / OR RO AT
9T I OR B Z I
- -39 F
,., 40F 2T I
COMI<>N ST I 2B I EQU I PMENT PORT ION ST OF 238A KTU
2 F I ,.,IF
4 F
T O BUSY TONE SUPPLY OR CONT CKT -=-BT:.....:O:.:.R_:B:;oZ __ �-+0-'-F----------( LF' OR Ll CKT I AND 2 1
TO l l NE CKT PART OF' 238A (F I G . 4 )
L F" OR l l
L F' O R l l
Lf OR L l L f O R l l
L f O R l l L f O R L 1
L f OR L l L W O R L 1 L W OR L 1
LW O R L 1
L W O R L 1 LW OR L l
LW OR L 1 L W O R l l
L W O R L 1
C K T 5 AND 6 1
CKT 3 OR 4 I
CKT 7 AND 8 I
CKT 9 t CKT I AND 2 1
CKT 5 AND 6 1
CKT 3 AND 4 I
CKT 7 AND 8 1
CKT 9 I
[ .. ... . ... t, BAT. OR GRO
t BAT. OR GRO
t BAT. OR GRO R R l O R R N CKT I THRU •
[ [
TO AUD S IG PWR SUP
[ OR V I S ANO AUD S I G CKT
TO 30A KTU
R . R I O R R N C K T 5 THRU 8 I
R R l O R R N CKT 9 1 R , R I OR RN
B OR B l CKT I THRU 4 I B OR 8 1 C K T 5 THRU 8 I
B OR B l C K T q 1 B OR B l GRD OR R GRD BAT •• t OR 1 05 t GJ H A l
®
TO
LK
co
5G MAX 50 lAMPS
� PER LEAD
n.25G
>5g) 6G
;r.y 26G ,-------< '•!Y
:::;:ro
)Jg) 27G
X'i:"'J I . BG
�"1 2BG
Xe� 9G
19G ,.,.29G
39G 22F .p
2 fl 2 F')
2 1 f
�Fl CI<T I THRU 4
INTERNALLY 2 5 Fl W I RED ON
Wl, 238A KTU
W1 leo ILK ITo I"• XJ >OF I I I I
,..------<
--<
r<
KS-15900, L 1 I N TERRUPTER FLRNISHED WITH 23BA KTU *
s l f-: __ _JV s I : f
1 0
3· 1 7 1 3
1 1 6
as I l l 1 9
1 2 la7 1 4
I S
I B 3 8 120
1 2 1
LEGEND * I NTERRUPTER CONTACTS SHOWN IN STAR T I N G POS I T I ON . t 238A KTU fURNI SHED W I TH I N D I CATED CKTS
EXTERNALLY STRAPPED AT fACTORY W I TH AUX T I ME-OUT CKT W I T HOUT AUX T I ME-OUT CKT I NTERRUPTED COH AUD S I GNAL U S I N G ELECTRO lotECH I NTERRUPTER (COiot EQU I P POR T I ON O F 238A O R 232A/8 KTU )
Fig. ! �Functiona l Schematic of 238A KTU (CO or P BX line Circuits).
Page 22
BSP 518·114·110·i03_1972·10·22.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock'L' �CO<JJIIC>O[<ra��;d�C>0'-.'-0!!-C <_t �13"'-.'2:c0C11�2.1�7c -:�54�:"'0!'.6----------------
:1111 CD < iii" CD a.. z 0 < CD 3 cr ., � : :(i CD .... � lol l.)
TO POWER
SUPPLY
7
0
268 KTU
co 1 3 6 BAT � ""' '<-'
B BAT ..; co • ,...,. -w 'U I ZT I I
� ""'\ � 'U
co ,.a, 'U
9 lOT
co ;,_ 1 O T "-'
co 1 0
• 6 T 'U co ).;.
3 4T 'U co � I 2T 'U
co 1 4
I 28 'U
co ;.;. 3 48 'U
co � 5 60 'U
co )..! 7 OB
'U co 1 8 ,...,.
l OB 'U
co )( 0 1 28 I I
co
B
T
T
R J TO CO OR PBX LINE CKT
T l
TO TEL S E T
R I
T l ] TO 2ND 29A KTU
R l
T l
R l J T O 3RO
29A KTU
T l ] T O 4TH
R l 29A KTU
T
J TO KEY TEL
R STA PU KEY OR
TO 5TH 29A KTU
29A KTU
0 1 2 c o ;;;, CT
1 5 ;;;_ B GRD 'U /"V./ 4T 3 0 B BAT
t -<;-I
0 � CT 0 B
"-' I 20
'<-'
T I CT 0 ,...,. 'U
6T • B BAT
R � CT
'U 60 5 0
T l 4
�
[ �· r
400A VAR
R l\_; 6
( "-' TO CO A ..;, CT
OR PBX 'U ll NE CKT 2T I
OPT IONS: 9 STAT ION CAN CUT�Off OTHER STAT I ONS AND CAN NOT BE CUT-Off § STATION CAN CUT-Off OTHER STAT I ONS AND
CAN BE CUT·OH EXCEPT DURING A CAll
0 3TAT ION CAN NOT CUT-Off OTHER STAT I ONS
AND CAN BE CUT-Off EXCEPT DUR I NG A CALL
Fig. 1 7--+Functional Schematic of 26B KTU (Automatic Cutoff Circuit) and 29A KTU (Cut Through Relay Circuit).
TO
POWER SUPPLY
iii "' � "' "' n .... 0 z
! 0
SECTION 518-114-110
Page 24
24 Pages
Reissued November 1973
Fig. 184Functional Schematic of 30A KTU (Time-Out
Circuit).
BE L L SYSTEM PRACTICES
AT&TCo Standard
1 . GENE RAL
:················································································································ REPLACING PAGE ADDENDUM
Filing lmtructioTUJ: 1. lfiiOV£ FIOII THE SECTION THE PACES NUllifiED THE SAllE AS THOSE ATTACHED TO THIS PINK SHEET. :: 2. INSERT THE ATTACHED PACES INTO THE SECTION IN THEIR PLACE. ::
3. nACE THIS PINK SHEET AHEAD OF PACE 1 OF THE SECTION. :: :-.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·········································-·.·.·.·.·.·.·.=·
REFERENCE
1 A 1 KEY TELEPHONE SYSTEM
KEY TELEPHONE UNITS 2. IDENTIFICATION
ADDENDUM S18- 1 14-1 1 0
Issue 3, August 1974
1 .001 This addendum supplem e n ts Se ction The following changes apply to Part 2 of the
518-114-110, Issue 3. The attached pages must be inserted in the section in accordance with the filing instructions above.
1 .002 This addendum is issued to:
(a) Correct Fig. 3
(b) Correct Fig. 4
(c) Correct Fig. 7
(d) Modify Note 3 of Fig. 8
(e) Correct Fig. 14 to show 232C KTU.
Attached:
Page 7 dated August 1974, revised
Page 8 dated August 1974, revised
Page 1 1 dated August 1974, revised
Page 12 dated August 1974, revised
Page 19 dated August 197 4, revised
Page 20 dated August 1974, reissued
Page 23 dated November 1973, revised
Page 24 dated November 1973, reissued
section:
(a) Fig. 3-revised
(b) Fig. 4-revised
(c) Fig. 7-revised
(d) Fig. 8-revised
(e) Fig. 14-revised
@ American Telephone and Tclc�raph Company, 1972, 1�)7:{, 1974 Printed in U.S.A.
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