518-410-100_i6 - 6a key telephone system identification & installation
TRANSCRIPT
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BELL SYSTEM PRACTICES
Plant Series
SECTION 518-4 10-1 0
Issue 6, November 196
AT&TCo Standar
6A KEY TELEPHONE SYSTEM
IDENTIFICATION AND INSTALLATION
1. GENERAL
1 01 This section 1s reissued to include the
following:
• 227B key telephone unit (KTU) replacingthe 227A KTU which is rated MD.
• Show 229B KTU as an additional choice forsingle add-on transfer circuit.
• Installation information formerly covered in
individual6A arrangement connection sections.
Since this reissue covers a general revision, arrowsordinarily used to indicate changes have beenomitted.
2. IDENTIFICATION
PURPOSE
2.01 The 6A Key Telephone System, available in
three arrangements ( s e l e ~ ~ . ~ ~~ . and two-talking link), is a single and/or 2-digitdial selective intercommunicating system designedprimarily for on-premise operation. However, with
the use of a long line circuit, remote stations haveaccess to the local 6A system facilities.
DESIGN AND OPERATING FEATURES
2.02 The 6A Key Telephone System offers avariety of service features to the customer
depending on the type of basic arrangement (selectoronly, single-talking link, or two-talking link) installed.Some optional features can be obtained by strappingchanges on key telephone units; other featuresrequire the addition of key telephone units.
2.03 The selector only arrangement (Fig. 1)
provides for:
(a) Access to a colmUon talking path for amaximum of 36 stati61l .codes.
(b) Rotary dial station selection.
(c) TOUCH-TONE® dial station selection utilizinthe 247A (MD) or B key telephone unit.
(d) Line busy lamps.
(e) Station signaling over a separate pair bmeans of a single-spurt audible signal.
(f) Preset Conferencing: This optional featurenables a 6A station to simultaneously selec
and signal a group of preselected station
(maximum of six) by means of either a diale
code or the operation of a signal key. Severapreset conference arrangements may be provideat an installation and a particular station caappear in one, all, or none of these. Assignmenof a single or 2-digit dial code for each prese
conference reduces the total number of 6A statiocodes in the system by that amount.
Note: For transmission reasons, prese
conference-connected stations should not b
bridged onto a central office or PBX line bmeans of the add-on conference circuit of th6A Telephone System.
(g) Off-premise Stations connected to the 6Asystem by means of a long line circuit wi
provide satisfactory transmission if the followinconditions are met:
(1) All off-premise stations must be equippe
with 500-type telephone sets.
(2) The maximum external loop between th
off-premise station and the long linecircuit (225A KTU) shall not exceed 500 ohm
when operated at a minimum battery potentia
of 20 volts.
(3) Off-premise stations that may be connecteto the add-on conference feature shoul
not exceed a 1000-cps loss of 8 db from thstation to the serving central office.
© American 'Fe.lephone and Telegraph Company, 1967
Printed in U.S.A. Page
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BU SY TO NE
FLA SHINGLAM P
INTERRUPTE D
RINGING
r--
'
lB KTU32
EL E
MEC H
FLA SHRIN G
CTRO -
ANI CAL
, WIN K,,AN D
E OUTIM Ci RCU IT
I PE R SYS TEM
214B KTU (M D)
SI NGLE -LIN K BATTERY FEED
AN D 9-STATIO N
SIGNALING CIRCUIT
19 B K TU ,
20 9A KT U, OR
21 2A KTUFLASH! NG
CIRCUIT
215A KTU3-STATION
SIG NA LIN G
CIRC UIT
21 7B KTU
CO NF ER EN CE
TIM E-OU T
C IR CU IT
227 8 KTU
STAT ION
BU SY
CI RC UI T
-- -
..__
.._____
f - - BU SY TON E
'---1--- - FLASHING
LAMP
,. . .---
·.-
' - - -
r--
._ __
I PER
AD DI TIO NA L 3 STA TI O NS
I PE R
SY ST EM
I PE R
3 STA TIO NS
ISS 6, SECTION 518-4 10-1 0
21 6A KTU
TRANSFERCIRCUIT
207 C KTU
SELE CTOR
CIRCUIT
I 24 7B KTU
TOUCH-T ONE
AD AP TE R
CIR CUI T
21 7B KT U
PR ES ET
C O NF ER EN CE
CIRCUIT
22 7B KTU
SIN GLE Ll NE
ADD -ON
TRAN SFER CIRCU IT
229B KT USINGLE OR
MUL TIPLE LI NE AD D-ON
TRANSFER
CIRCUI T
22GB KTU
ADO-ON
CO NF E R EN CE CIRCUIT
224B KTU
BU SY TO NE
AND CAMP-O NCONTR OL
CIRCUIT
22 7B KT U
RINGINGAND TONE
CONTROLCIR CUIT
22 5A KTU
LONG LINE CIR CU IT
227 B KTU
AUXILIARY
REL AYBUS Y LAMP
CIR CUIT
22 78 KTU
AUXILIAR YRELAY
LAMP FLASHCl RCUI T
I PE
ADO
R
ITIONALDE Sco
I PE
SYS
R
TEM
I PE R
TEM YS
I PE R 2
PRE CON
SET FERENCEANG EM EN TSRR
I PE R 3 CO NT ROL
TIONS TA
OR I G NATING
-O NFERENCING
AD D CON
I PE R CON TR OL
TION
GI NATING
-ONFER ENCING
STA
OR I
AD DCON
I PE R CO ORPBX L l NE TO BE C O N FE R EN C EO
f - -
I PE ~ ~ -
TO KEY
TELEPHONESYSTE M
R SYS TEM
DIAL TON E
BUS Y TO NE RINGING TONE
STA TIO N BUSY
I PE R SYSTEM
IPPED WITH
L TO N E AN D
ERRUPTEO
GING
EQUDIAINTRIN
I PE R OFF MISE
TIO N PRE STA ~ TO OF F
PREMISESTATION
I p
WHER SY ST EM
EN OVE R 40
Y LAMPS US
I PE R SY STE M
WH EN OV ER 20ULTAN EOUS SHI NG LAMPS
SIMFL A
Fig. 2-Single-Link Arrangement Using 2148 KTU (MD)
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SECTION 518-4 10-1 00
.BUSY TON E
FLASHING
LAMP
INTERRUPTED
RINGING
Page 4
----
r - -
232B KT U
ELECTRO -
MECHANICAL
FLASH,WINK,
RI NG, AND
TI ME OUT
C IRCUIT
I P ER SYSTEM
216A K TU234A KTU
TRANSFERSINGLE LINK
CIRCUIT BATT ERY FEED,
9-STATION
SI G N AL IN G
CIRCUITS,
SELECTOR
AN D 215A KTU
TRANSFER.___
3-STATIONSIGNALING
CIRCU IT
217 B K TU
'- -- PRESET
CONFERENCE
CIR CU IT
19B KTU,
20 9A KTU,
OR-BUSY TON E 227 8K TU
212A KT USINGLE LINE
r--- ADD-ONFLASHING f-- FLASHING TRANSFER
C IR C U IT LAMP CI R CUIT
2298 KT U SINGLEOR MULTIPLE
,.- LINE ADD-ON
TR ANSFER
CIRCUIT
,____
2268 KTU
ADD-ON . . . ._
C ON FE R E N C E
CIRCU IT
224B KT U
BUS Y TONE AND
CAMP- ON
....--- CON TROL
CIRCUIT
...._ 227B KT U
RINGING AN D
TONE CO NTROL
CIRCUIT
I PER
247B KT U SYSTEM 2 25 A K TU
TOUCH-TONELO NG LIN E
ADAPTERC IRCUIT
C IR C U IT
I PER
2178 KT U SY ST EM 227B K TU
AUX ILIARYCON FERENCE
RELAY BU SYTIME- OU T
LAMPCIR CUI T
CIRCUIT
I PE R227 B KTU
227B KTU 3 ST ATIONS AUXILIARY
STATIONRELAY LAM P
BUSYFLASH
CI R CUITCIRCUIT
Fig. 3-Single-Link Arrangem ent Using 234A KTU
!PER A DDITIONAL
S WHEN
MI S OVE R
9 CODE
SYSTE
18 COD ES OR WHEN SY STEM
R 9 CODES USING
KT U
IS OVE
24 7B
I PE R
AD DITI ONAL
TIONS ST A
I PER 2 T RESE
CONF ERENCE
ARRA NGEMENTS
I PER
ST ATI
ORIG I
CO N F
!PER
ST AT I
OR IG I
CONF
I PE R
3 CON TRO L
ONS
NAT ING A D D - ON
ERENCING
CO NTROL
ON
NATING ADD-ON
ERENCING
CO OR
PB X
BE C
LINE TO
ONFERENCED
f--
I PE R
f---+f---+
TO KEY TELEPHONE
SYSTEM
SYSTEM
DI AL TON E
BU SY TONE
RINGING
TONESTA TION BUSY
I PER SYSTEM
PPE D WITH
TO NE AND
RRUPTED
lNG
EQUI
D IA L
INTE
RING
I PE R OFF-
PR E MISE STAT ION
1----+TO OFF -PREMISE
ST ATI ON
IPE R SYS TE M
WHE N OVER 40
Y LAMP SUS
IPE R SY STE M
WH
SIM
EN OVER 20
ULTANE OU S
SHING LAMPSLA
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(j) Automatic cutoff of all, some, or none 0L
the associated stations. Stations that ate
wired for automatic cutoff are prevented, onpickup, from being transferred onto an exillting
talkibg connection on the link.
(k) Rrnging tone to the calling statioo wheninterrupted ringing is provided.
(l) Off-premise stations as described in 2.03.
(m) Preset conferencing is an optiGnal feature
that enables a 6A station to sE11.ect a groupof stations (maximum of six) by means of a
dialed code or the operation of a signal key.Several preset conference arrang ments may beprovided at an installation, and a articular stationcan appear in one, all, or no of these. Use
of a dial code for selecting a reset conference
would reduce the number of A stations on thesystem. The visual signal i used to indicatethe progress of a confere e call. When aconference call is originated. the calling station
has a steady busy lamp, anrl the called stations
have the flashing line lamp. As soon as thefirst called station answel1S, the calling stationlamp begins to flash and ctmtinues to do so untilall stations have answertfd. All lamps then gosteady indicating that the conference is nowcompleted. The preset conference unit (217B
KTU) provides a time" release of unansweredstations. I t eliminates .continued ringing of ·an
unanswered station be(!, approximately 30 secondsafter the calling patty goes off-hook. lt alsostops the flashing lamps of all conferees, silences
the busy tone if one of the called parties isbusy on the s y s t ~ m . and allows camp-on to beused.
Note: Fo:r: transmission reasons, preset
conference-connected stations should not bebridged onto a central office or PBX line bymeans of the 6A add-on conference circuit.
(n) Selective conferencing is available where
pushbutton signaling has been provided. Theconference is called by operating a number ofpushbuttons (maximum of six) simultaneously.The visual signal is used to indicate the progress
of a selected conference call, as described inpresJ!t conferencing.
ISS 6, SECTION 518-41 0-1 00
(o') Camp-on is a feature that allows a 6A s t a ~ o n ,wired for automatic cutoff, to go in over
the 'busy lamp, indicating the system is busy,
and dial a stat ion code. The dialed .tode isstored I'l:l the selector. The calling station receivesa busy t\lne indicating to him, as well as to any
other staf>ion which subsequently picls up, that
the system is now camped on. Whe1! the systembecomes f r e ~ , the previously sele<ted station isautomatically signaled without flrther operationby the calling .station. S t a t i o r ~ not wired forautomatic cutoff cannot orightate the camp-on
feature, as they Wi>uld immediately be transferredonto the primary 1\nk on p ~ k u p .
Note: When the SA ~ s t e m is equipped withstation busy circuits, '1. camped-on call will notcut through until all station busy circuits arenormal.
(p) A station busv circuit causes a station, soequipped, to :JPpear b u ~ y to the 6A system
whenever that s t ~ t t i o n is off-hook and connected
to any line othEt' than the 6.1. line. This circuitprovides for busy tone to ~ returned to the
calling statior1. To provide this service the 6A
system must be equipped with the busy signaland camp-Qfl control unit (2241! KTU).
Note: When the 6A system it equipped withthe ce.mp-on feature, a camped-()n call will not
cut {hrough until all station b u ~ y circuits arenotmal.
(q) Add-on conferencing as described 1n 2.03.
2.05 The two-talking link arrangement (l'ig. 4)
provides for:
(a) A selector and a pr imary talking link asdescribed in 2.04 plus the addition of a
secondary talking link. This enables one sys tem
to carry on two simultaneous and independentconversations. Whenever the secondary link isfree, a call on the primary link is automaticallytransferred to it, thereby freeing the primary
link for another call. A slight click is heard
during this transfer operation.
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SECTION 51 8-4 1 0-1 00
FLASHING
LAMPS
BUSY TONE
INTERRUPTED
RINGING
Page 6
r---
lB KTU32
ELEC
MEC H
FLASH
RING
TR O-
ANI CAL
, WINK,
, AND
OU TIM E
CIR CUlT
-
22 2A KT U --2-L IN K
BATTERY
FEED AND
9- STATION
SIGNALING
CIRCUIT
'----
~ 19B KTU,
20 9A KTU f..--- FLASHING
OR LAMPS
212A KTU
FLASHING f---+ BUSY
..____
CI RCUIT TONE
-
:,--
. .__
r--
' - - - -
I PER
223A KTU ADDITIONAL
3 - STATION 3 STATIONS
SI GNALING
CIRCUIT
I PE R
2178 KT U SYSTEM
CONFERENCE
TIME-OUT CIRCUIT
I PER
227B KTU 3 ST ATIONS
STATION
BUS Y
CIRCUIT
Fig. 4-Tw o-Link Arrangement
21 6A KTU
TR ANSFER
CIRCUIT
207C KTU
SELECTOR
CIRCUIT
I2'17B KTU
TOUCH-TONE
ADAPTER
CiR CUIT
1!17B K"f(J
PR'IS !!iET
CO NI'EftENC E
CIRCUIT
227B KTU
SINGLE LINE
ADD-ON
TRANSFERCIRCUIT
I PE R
TIONAL
DES
ADD I
9 co
I PESYS
I PE
RTEM
R
EMYS T
I PE
PRE
CO N ARR
R 2
SE T
FERENC E
ANGEMENTS
I PE
STA
R 3 CONTROL
TIONS
OR I GINATING ADD-ONFERENCINGON
229B KTU SINGLEI PE R CONTROL
TIONR MULTIPLE
LINE AD D-O N
TRANSFER
CIRCUI T
226B KTU
ADD-ON
CONFERENC E
CIRCUI T
224B KT U
BU SY TONE
AN DCA MP-ON
CONTROL
CIRCUIT
2278 KTU
RINGING
AND TONECON TROL
Cl RCUIT
225A KTU
LON G LINE
CIR CUIT
2278 KTU
AUXILIA RY
RELAYBUSY LAMP
CIRCUIT
227B KTU
AUXILIA RY
RELAY
LAM P FLASH
CI RCUIT
STA
OR I GINATING ADD-ON
FE RENCINGON
I PE R CO OR
PBX Ll NE TO
CONFERENCED E
t----TO KE Y TELEPHONE
SYSTEM
I PE~ R SYSTEM
DIAL TONE
BUSY TONE
RINGINGTONE----
/---+ ST ATION BUSY
I PE
EOUI
R SYSTEM
PPED WITH
TONE AND
RRUPTED
lNG
DIAL
INTE
RING
I PE R
PREMISEFF-
STA TION
f---+TO OF F- PREMISE
STATION
!PER SYSTEM
WHE NOVER 40
LAMPSUS Y
I PER SYSTEM
WH ESIMU
N OVER 20LTANEOUS
HI NG LAMPSLAS
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(i) Ringing tone
(j ) Selective conferencing
(k) Station busy feature
(I) Off-premise stations1 per
(m) Add- on c o n f e r e n c i n ~ 2·03
(n) Busy tone to a calling station when thecalled station is busy on the secondary link.
(o) Preset conferencing as described in 2.04 withthe added feature of the calling station
receiving a busy signal when a station that is
part of the preset conference arrangement calledis busy on the secondary link. Busy tone would
be heard until the first called station answers.
(p) Camp-on when associated with a two-linksystem and using the 224A KTU (MD) has
two phases of operation.
(1) Camping on a busy system (both links inuse) as described in 2.04 with the camp-on
control circuit locking operated under controlof the secondary link. The release of thesecondary link and the transfer operationfreeing the primary link would allow the called
station to be signaled automatically. Had theprimary link released first, the camped-oncondition would have persisted until the
secondary link had released, even though alink is available.
(2) The second phase of operation allows a
calling station to camp on when a stationthat is busy on the secondary link is called.Under this condition the calling station receives
ISS 6, SECTION 518-41 0-1 00
the busy tone and then reserves the intercom
system until the secondary link releases.
(q) Camp-on when associated with a two-linsystem and using the 224B KTU permit
the camp-on circuit to cut through when eithe
the primary or the secondary link become
available and the called station is idle.
Note: When the 6A system is equipped wit
station busy circuits, a camped-on call will nocut through until all station busy circuits ar
normal.
APPLICA l iON
2.06 Used in conjunction with CO or PBX lincircuits normally connected to lA, lAl, o
1A2 Key Telephone Systems or lOOA, lOlA, or B
or 102A Key Equipment.
ORDERING GUIDE
2.07 Unit, Telephone, Key __
Note: Order required units per Table A.
2.08 A two-talking link 6A Key Telephone System
is available in packaged form. For informatio
see Section 518-210-402.
ASSOCIATED APPARATUS
2.09 Power Supply
(a) The 6A Key Telephone System is designeto operate from a 20- to 26-volt de source
Since associated installations of other keequipment or key systems may operate at
somewhat lower value, 14 to 26 volts, it mabe necessary to replace the existing power supplor use an independent supply for the 6A system
equipment.
(b) The J86731A, List 4 (101G) power plant mabe used as an independent power supplfor any size and arrangement of the 6A KeTelephone System with the following limitations
• No load other than the 6A is placed on thpower plant.
• 20-volt talk terminals are used only fobattery designated A.
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SECTION 518-4 10-1 00
• 20-volt signal te rminals are used only for
battery designated B.
• 18 -volt ac terminals, audible and /or visual
si gnals, do not exceed 1.4 amperes .
• 10- volt ac terminals operate a m aximum ofseventy -two 51A la m ps, current drain not
to exceed 2.8 amperes .
When 10- and 18-volt ac taps are used
on the power plant, th e maximum
to tal current drain shal l not exceed
1.4 amperes.
• 105-volt ±terminals o pera te s imultaneously
one to e ight high-im pedance r ingers w ithou t
capacitors or one or tw o high-impedance
ringe rs w ith capacitors (one to three if 70
to 110 volts or one to five if 60 to 110 volts
is permit ted ).
• I f circuit failure occurs due to low line
voltage, move the p r imary tap to 111 volts.
(c) The following power plan ts have a capacity
large enough to be used as a common power
plant for combined sta t ion systems:
• J86471B, List 1 (101J)
• 19- o r 20-type
• 29- or 30-type
(d) ~ n r ingers are used as audible signals, a
separate pow er source supplying 105 volt s
20 cy cles must be provided when using the 101J
power plant. The 20- and 30-type pow er plants
include a 30-cycle ringing supply.
Note: W h e n us ing the 30-cycle supply ,
off-premise sta t ions must not be equ ipped wi th
intermediate t r ansmiss ion or toll ringing
repeat in g fa cilities.
(e) For power supp ly arrang e m e n ts , refer to
Section 167-400-180.
Page 8
(f) W hen centra l office, building, or local battery
is supplied, fuse as follows:
• One 2-amp fuse for talking battery designated
A.
• One 2-a m p f u se for signaling batterydesignated B.
• On e 2-amp fuse p er maximum of 36 signal
lamps.
• One 2-am p fuse for de audible signal supply.
Note: When th e sam e de source is used for
talking and audible signal operation a noise
suppression capacitor, such as the 23A KTU,
should be installed across the battery supply.
2.10 Appara tus m ountings, cabinets, and relay
racks for mounting key telephone units of a
6A system are as follows:
(a) A pparatus M ountings
• 16-type
• 26-type
(b) Cabinets
• 11 and 18 p late
• 26 plate
• 45 plate
• Floor-supported
(c) Relay Rack s
• Wall
• Floor-supported
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ISS 6, SECTION 518-41 0-1 00
TABLE A
KEY TELEPHONE UNITS
USE PANEL WIDTH
KTUQUANTITY REQUIRED SEL· SINGLE · TWO-
FI G .
CODECIRCUITS
7/16- INCH NO.ONLY L IN K LIN K INCHE S
MODU LES
ARR ARR ARR
207C Selector 1 pe r system • :=:
• 5 -7 /32 12 5
21 5A 3-stat ion signaling 1 per 3 additional sta tions • 3-2 9/32 9 6
216A Transfer 1 pe r additional 9 codes • • 3-1/32 7 7
Preset conference control 1 pe r 2 conference arr • • •217B 3-15 /3 2 8 8
Conference time-ou t 1 pe r system • •22 2A Batt ery feed and 9-station
signaling1 pe r sy stem • 23 49 9
223A 3-station signal ing 1 per 3 additional sta tions • 5-2/32 13 10
224 B Busy signal and camp-on co n - 1 pe r sys tem •t •trol
3-15/3 2 8 11 225A Long line 1 pe r off-p rem is e station • • • 5 12
226 B Add-on conference contro l 1 pe r CO or PBX li ne to • • • 3-15 /3 2 8 13
be conferenced ---1 per sy stem equipped
Ringing and tone control with dial tone an d in ter- • • upted ringing
1 per 3 control st ations
Single li n e add-on transfer each originating 1 add-on • •conference l in e
227B Au xil iary relay busy lamp 1 per syste m when over 40 • • •3-1/32 7 14
+ line busy lamps
Auxiliary relay lamp f lash 1 pe r sys tem when over 20
• •simultaneous flash inglamps
Sta tio n busy 1 per 3 st ations • • 228A Blank ap paratus pa nel assem- As required for bridging • • • 3 -1 5/3 2 8
bly purposes
22 9B Single or 1 per control stationMultiple line add-on transfer originating 1 to 7 add-on • • 3-1/16 7 15
conference l in es
Electromechanical f lash , wink, 1 pe r system for flashing232§ ring, and time-out, when lamps, busy tone, and
• • 3-15/32 8 16type equipped with KS 15 900 , interrupted ringingList 1 in ter rupter
234A Ba ttery feed , 9-station signal- 1 pe r system ing, selector, an d transfer • 23 49 17
24 7B TOUCH-TONE adapt er 1 per sy stem • • • 7-15/32 1 7 18--- 1-----19 B§ Flashing 1 pe r system fo r flashing • • Mounting detail pe r
lamps and busy tone lo ca l engineering
" Equivalent of on e of these units is included as part of the 23 4A KT U
t Supply only when camp-on, dial tone, ringin g tone, or st ation busy circui t i s fur nished
t Uni t consists of three identical relays. Some feature s li sted require one or two relays. Remaining relay(s) may b
utilized fo r othe r fea tures.
§The required interruptions may be fu rnished by an associated key telephone system.
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SECTION 518-41 0-1 00
(d) To determine the size of the mounting facility,
the following should be taken into consideration:
• Type 6A arrangement
• Number and size of key telephone unitsrequired
• Future requirements
• Mounting of power supply
• Whether 6A system to be mounted separatelyor combined in same facility with associatedkey system.
(e) Refer to Section 463-140-100 for identification
of the mounting facilities.
Page 10
SElSD69286·01
Fig. 5-207C KTU, Selector Circuit
A
3 - STASI G
CKTS
Fig. 6-215A KTU, Signaling Circuit, Single-Talking
Link
Fig. 7-216A KTU, Transfer Circuit
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ISS 6, SECTION 518-41 0-1 00
Fig. 8-2178 KTU, Preset Conference Control Circuit
9-STA SIG CKTS
COMMON
EQU IPMENT
Fig. 9- 222A KTU, Battery Supply an d Signaling Circuit, Two-Talking Link
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SECTION 518-41 0-1 00
3-STA
SIG
CKTS
Fig. 10-223A KTU, Station Signali ng Circuit,
Two-Talking Link
Fig. 11-224 8 KTU, Busy Signal Camp-On Cont ro l
C ir cuit
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lONG liNE
s o - 6 9 2 8 6 ~ 1p
Fig. 12-225A KTU, Long Line Circuit
F. 13-2268 KTU, Add-On Conferencing Cont ro lg.
Circui t
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Fig. 14-2278 KTU, Auxiliary Relay Circuit
ISS 6, SECTION 518-410-1 00
•
· ~229B KTU
Fig. 15-2298 KTU, Single or Multiple Line Add-O
Transfer Circuit
Fig. 16-2328 KTU, Electromechanical Flash, Wink,
Ring, and Time-Out Circuit
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SECTION 5 18-41 0-1 00
SELECTOR
CKT 9-STA SIG CKTS
COMMON
EQU IPMENT
Fig. 17-234A KTU, Battery Feed and Signaling (Single-Link) Selector and Transfer Circuit
Fig. 18-2478 KTU, TOUCH-TONE Adapter
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3. INSTALLATION
3.01 Before commencing the installation of a 6A
system arrangement observe the fo llowing:
• Determine from the service order and work
sheet the type arrangement and features
required by the customer .
• Select the key telephone units required byreferring to Table A.
• Select a suitable mounting faci lity .
• Select an adequate power supply.
3.02 A careful review of the immediate needs of
the 9u.stomer, together with a considerationfor his future rearrangements and requirements,
will be beneficial in determining the method ofinstallation. Since each installation will vary to a
degree because of individual requirements, they
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should be arranged in a m anner that will permit
maximum flexibility under the particular circumstances.
3.03 The installation of apparatus, key telephone
units, keys, stat ion sets, and other i tems
common to general stat ion work is covered in the
section pertaining directly to each ite m .
Handling of key telephone units
sometimes results in damage to
wire-spring relays . Af te r mou nting,
visually inspect all wire-spring re lays
for the fol lowing:
• Improper po sition of conta ct springs
• Broken actuating cards
• Im proper position of actuating cards
3.04 C ertain features can be obtained by st rapping
between individual key telephone units. O th er
features require such leads as T, R, L, LG, S,
Sl, A an d AI, normally ass ociated with stat ion
apparatus. For ease of w iring both at the t ime of
original installatio n an d at the time of fu ture
ad ditions or rea r rangement s , i t is suggested that
su ch leads be brought ou t and terminate d at a
common c r o s s - c o n n e c t m ~ ooin t.
3.05 Plant series sections covering the 6A Key
Telephone Sys tem ar rangements are as
follows:
(a) Con nections
• 518-410-400-Selector Only
• 518-410-401-Single-Talking Link
ISS 6, SECTION 518-41 0-1 0
• 518-4 10-402-Two- Talking Link
(b) Maintenance
• 518-410-300-Selector Only
• 518-410-301-Single-Talkin g Link
• 518-410-302 -T wo-Talking Link
3.06 Information covering the 247A (MD) an
247B (TO UCH-TONE adapters) key telephon
units are covered in Sections 518-310-113 an
518-310-114, respectively.
3.07 For m ain tenance of the 204-type selecto
which is a part of the 207C or 234A KTU
refer to Sections 069-339-801 and 026-708-801.
3 .0 8 For deta iled operational informatio n refeto the following:
• CD- and SD-69286-In te rcommunicating Lin
Circuit
• CD- and SD -69288-Pane l Mounted Unit s
• CD- and SD-69294-Visual and Audible Signa
Circuits
• CD- and SD-69447-T OUCH- ' rO N E Adapte
Circuit (247A KTU )
• CD- and SD -69529-TOUCH -TONE A dapte
Circuit Type D2 (247B KTU )
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BELL SYST EM PRACTIC ES
Plan t Ser ie s
ADDENDUM 518-410-100PTI ssue C, M ay, 19 61
Pac if ic Tel
6A KEY TELEPH O NE SYSTEM
IDENTIFICATION
1.000 INTRODUCTION
• This addendum supp lem ents S ect ion 518-410-100. It is i s sued to change and
de le te portio ns of the section to conform
with ta r if fs f il ed in the Pacif ic Co.
• This addendum sha ll be re ta ined w it h
subsequent is sues of the section unless
re issued o r cance lle d .
• Mark the changed portions of th e sec -
tion with the c r o ss- re fe r en ce "See
Addendum ''.
2.000 CH ANG ES AND DELETIO NS
• D elete a ll in fo rmation wit hin the sec tion
tha t re fe rs to th e "Sin gle Talk ing Link"
arrangem ent.
• D elete a ll "Se lector O nly" in fo rmation
tha t refe rs to S ignal Key Station Se lec -
tion.
• Change th e maximum number of sta tion
codes used on th e "Se lec tor Only "
arrangemen t from 36 12._ 40,
@)The Pacifi c Teleph on e and Telegra ph Company, 1960
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