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Патент USA US2405332

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ug. 6, >1.9496.
H. H. scHRoEPPEL
TOLL TELEPHONE DIVERSION SYSTEM
Filed Nov. '7, 1944
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2,405,332
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_2 Sheets-Sheet 1
Aug. 6, 1946._
H.' H. scHRol-:PPEL
`
TOLL TELEPHONE DIVERSION SYSTEM
Filed Nov. '7, 1944
2,405,332
2 sheets-sheet 2
Patented Aug. 6, 1946
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UNITED
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2,405,332
STATES
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OFFICE ._
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'ront TELEPHQNE DIVÉRS'IGN -sYsTlîEivi A _» '
Harold ‘Henry _Sçhr0epl1el,’GlenfRock, N. J., as-v l
signor to American Telephone »and Telegraph .
Y
1
îThisf‘invention relates tol _telephone systems,
and .especially to _step-.byes‘tep telephone systems
in which private :branch exchange apparatus,
otherwise knowïn _as PBX, is employed to ,connect
inatical'ly -_the _general*featuresV of a -step-by-step
telephone system >employing the principles of fthe
invention, and Fig. _’Z’shows a more detailed día
grarn 'of the _apparatus required to jpractiee >the
one ror more «calling 4stations .to a central .,oñice.
invernion,`
More',particu'lar‘ly',> this yirn/_entio-'n relates ‘toÍa'pé
.paratusH-in ,rstepebyïs’tep telephone's'ysi'aein'sV for
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_
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"fReferring to Fig, >lj'of» the drawings,l the PBX
Oñìçefand ‘the> central'ojlîiceCQ are shown con
automatically diverting >certain types of calls,
suchas 'toll calls, to an attendant at the PBX.
_Telephone `companies offering a. dial typeffof
netted. to' each >other ¿in astep-by-step telephone
_'yst'er'n, ` 'ï'Íhe'gcal‘ling station designated l, which
is ’
PBXservice have heretofore¿madeavailablegto
' ef dial type, is connected `through a line
„and after dialing the central oii‘lce code,
vtheir ,subscribers a v`special-1 arrangement of appa7
ratos «by .which the .calling stations, Within the
PBX ~area xnaydial l.local ~calls unrestrictedlyçoutè
diverting, relay apparatus' ¿land trunk apparatus
Íverted thePBX attendant. The ,local >-calls
may ¿be completed through fthe Í-P'BX .equipment
and through the». equipment of the ,associated cen
îtral bilico without requiring the _»attentionloî ,the
oflicegjline rider 1 isfcaused to _iind thecalling
_ _
,connectedthrough a `first selector 3 `to >toll
pg, _the latterapparatusproviding a path over cable
' _'de the :PBX area, _but ,other calls -would .be ídi 15 fconductors’to 'the vcentral* -oilice C_O. When the
ophoesten@ il _1S thus connected to the-Central
_trunk ‘and dia'ltone _is returned from the associ`
lated' ` select_or'jä, VWhen. the' calling 'Station ~ l _dials
PBX-attendant. Although a eating statiónwit'n
20
in @hegPBX area may dial nlocal numbers without _ `-
restriction, ¿the arrangement ,was nevertheless -set
only bythe PBXattendant. >lrlovveverfthe equip-_
central o_ñice CO over the _equipment already de
scribed, tn_enthrough ii-rstselector 8 to the special
¿service _fof__un'lsapparatus[Hl _On the other hand,
ïupso as to automatically divert calls involving
toll _Ícharges‘from the ycentral oiiice to the PÈX.
.attendant so that ¿sucnftoll callsÍmay be completed
number 0; for example, iti/vill 'be connected Yto the
'when the callingstation l _dials No. ’1,12, for ¿ex
_25
nnent required îfor this kind `of »service is soex
ample, "it will >be connected _to the central voiiice
`>C() _over _the lequipment ¿already described, then
through the first Aselector 8, the Vspecial second
_selector '9 and the s_pecialithird selector-_lil >to _the
»pensive îinçîstep-Aby-step telephone systems as .to
,be practically »prohibitiveì
recording _completing trunk apparatus lf2. The
_calling'jstation‘may dial _number '0, for example,
‘_ Accordingly, fit is anoblectof this inventionto
provide Simple end__mearensire ¿equipment in '
to reach the ‘special apparatus i1 >So that the
central bñìceßperator ymay then complete a lshort
haul toll lca'll. _Number 112 may be dialed by the
callingstation' 'l _to'reach .the „Central Lofûce re
»types _of calls, such as çlocal calls, to be ,ma-deun
cording "completing apparatus l2 so `that the cen
traliofûceoper'ator _may .then ,complete a long dis
.step-by-jstep‘ dial telephone systemsto automati
:caliy divert to the vPBX »attendant certain types
.o_f calls, such astoll calls, While permitting .other
_restrictedly~
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In presen-t step-:by-step systems, Ithe »central
.;tanceicall'to vanother city, for example. However,
»oii‘ioe lbattery has yits positive terminal grounded,
but f_t-he polarity'of the battery »is «reversed to =oper
ate the 'call-ing Àpart-y’s 4message `register when a
call :is-¿completed ¿In .accordance with .the _present
according ,Íto the 'present invention, the dialing
_ofhnunibers >>0 .or _112 Will actuate the apparatus
H or |52 so as to-automatically switch _the calling
lparty’s .line »at the _PBX toll »diverting „apparatus
'9 îtogtheaiìileníìîäfnl?s _trunk apparatus 6, By »this
invention, _two p_olarities of batteriesare employed
v`at _the _Central omas, one yfor use -in Acorr-ipleting
_arrangement'ïthertoll or :long distance calls `will
be controlled by the PBX attendant so that only
`local calls ,andthe «other for ¿diventi-ng toll `{calls-to
annattendant.- The battery fused vfor Completing
flocal calls;may beone having -i-tsposi-tiveterminal
¿grounded and the other »battery may jbe one >hav
»ingits negative terminal fgrou-nded. »Arelay oper
ated vbythe :negativelygronnded battery and non
operated yby Ithe positively .grounded `battery will
those calls that-are ¿authorized by theattendant
will be completed ïbîy ¿the .attendant ¿through :the
>centralveiîice CO. ‘The «toll diverting apparatus
will 4vremain ‘undperated by ordinary local calls
50
«be Iern-ployedsfor _ the Acall -divertingr operations. y
_
-invention will be fbet'ter _understood _fr_oín
the more detailed description hereinaiterfîollovl.
inggïwhen read inconnection .with theaccompanyl
inademing-s mammal-‘lierre 3.1; ill’fntetles'sche- ~ 55
4fronrt'he calling station so that »such-'calls may
be completed throughjthecent-ral oiiice f'CG inthe
usual manner. lBut *the toll divertinggfeature will
_ come 'intopplay only jin response `to predetermined
dialedcodes emanating f-rom'the Ycalling station iI
Á2,405,332
3
relay LRz, the upper armature and back contact
of cut-oil relay CU2, the tip terminal of first se
lector 38, then through the line iinder and ñrst
selector relay apparatus 28, the tip terminal of
line ñnder 21, then over the tip conductor T of
the trunk, then through the trunk apparatus25
at the PBX oñìce, the right winding of choke
'I'_I‘, the right or operating winding o_fïrelay T to
ground 44. The current ñowing from battery 42
such as toll or long distance calls, unless sanc
tioned by the PBX attendant.
'
The essential equipment in use at present in
step-by-step ofñces may be understood by con
sidering the arrangement of Fig. 2 When the
calling station 2| dials a code to complete a local
call. The apparatusl labeled 4,»6, Il andv I2 `in
Fig. 1 is shown‘in .greater detail in Fig". 2. l When
the calling station 2| dials a local number, the
calling station,2l will be connected to the tip
and ring conductors T and R of a trunk leading
is in a direction that will cause relay T to become
to .the central cfûce CO, through’equipment of»
the PBX oñice, the PBX_„equip_ment_ includ
ing a line finder 22, line finden _andgñrst selector _ '
relay apparatus 23, a first selector 24,;the upper 15
armature of a relay such as_OP andtheback
contacts of these armatures, and trunk'equip- ‘
armatures of relay OP. The path tothe calling
station 2l Will now be transferred tothe PBX
attendant’s trunk apparatus 6. This diversion of
the callingstation 2| will cause'the line relay
LRn vof :the PBX attendant’s trunlr- apparatus
Y6 to become operated, the operating circuit in
32 and _ground .33: " The; linerelay‘LRi Will'then
operate and in 'turn operate 'relay~ SLi Ato 'ground
, the sleeve terminal S s_o’a's' tó'hold> the'coniiec- k30
' "
’and SLiMalso 'perform v‘other
-
In response to the operation of relay OP,.the
previouslydescribed path between'the ñrst se-v
lector -24 and the trunk conductors T and R will
be ' opened at Athe back contacts of the upper
_toai connector, ._selectorfconnector _or 'intero'ilice
repeater 3Q'. _Inthe deviceßß; the eircuitcon
tinues over the windings of relay LR1 to battery
tion'. _ Relaysi
as the Winding of relay OP is included in the lock
ing circuit of relay T, relay OP will be oper
locked.
20
second and third‘swelectoi‘s'if required (not shown)
functions, r_su_c_:l_1_ as~ _to control" the _establishment
of relay OP, battery 45 and ground. Inasmuch
ated at the same time that relay T becomes
ment
ring conductors
25 which controls
T and Rgextending
the trunk having
to the tip
central
Omce CO.VV _A_t the central office CO,_ the connec
tion _of _the _calling station' _2 ll continues _'ov`er' _' a
line lindert. 721, line finderfarld'ñrst'rèelecto'r‘relay
apparatus__28,_ a ñrst selectorZS; and then through
operated. Relay T will then be locked in its
operated position over a circuit which includes
ground 44, the left or holding winding of relay
T ka'n'clits make contact and armature, the Winding
cluding battery 52, the right Winding'of A`relay
LRsîft'he right'outer armature and _back contact
of'vcut-offl relay CUa, the inner upper Amake con
tact and'armature of-'relay OP, the .ring terminal
of ñrst‘selector 24, through apparatus 2,3, the
_important to noteltnat 'battery >ar'is’this ‘usual
terminalof line finder-22, calling station 2l',
Vcentral .oiiic'e battery which" has its positive ter-' 35 ringthe'tip terminal of line ñnder 22, the apparatus
o_fnthefcäonnectionto the 'called stationflt 'is
_minalgrounded in -steplbylstep systems 'and that,
after _theluca'lleçl ~station'.'-ha‘s- answered; "this bat'
tery is connected' tofthetip conductor 'T' of ‘the
While the ground 33Uis `connected tothe
ring. conductor'RÍof’fthe'ti'unlág
"
‘
ïfôuppose that the calling station'ì l' dialed` num'
bers Q instead ofthe number 'of 'a local station; Ã`In
responsefto _the ‘number 0,“ a ‘path through' the
PBX _station'vasvalí‘ea'dy >o’l'ltlined"’W'ill'b‘e ‘trav
23,v the tip terminal of first selector 24, the upper
outer armature and'make contact of relay OP,
the~ left
of line relay LRs,»the left back
‘_contact fand armature of cut-off relay CUS and
ground. '_' The operationv of line relay LRc in turn
operates relay CH over an obvious path completed
through the right make 'contact and armature' of
Y relay LRa.
- -line'
'I'he closure of the make contact
of_~ relayCH connects ground through the lower
-inne'r-> armature and make contact of relay- OP
tothe sleeve terminal of ñrst selector 24 to hold
Vthe
ñrs‘t selector 24 in its‘present position? The
finder2'l,~ thejlihë _iinder 'and iìi‘st'selector" relay
closure
of the make contact of relay CI-I will also
apparatus ?28';then through'the‘ iîrst selector "38,
_the armatures ofbúabffreiay-Cuz'a?dtheir'back 50 provide a holding path for relay OP through the
lovverr outer'make contact and armature of relay
contacts, the -windings‘o'iî line 'relay'LRz Vto bat
jojo the'patn‘wiuf bef continued through >'me line
OP.' The operation of line relay LR6 also com
pletesan obvious path over its left armature and
42 is poled
direction which is opposite to
make contact to illuminate theV PBX attend
>that of battery 32, the negative pole of battery
¿l2- being 'grounded at 43. The function of battery 55 ant’s lamp LL. This Will signal the PBXv at
tendant and the attendant may then obtainthe
42 'Will be explained presently.' The operation of
necessaryiniormatìon from the calling station to
`line relay LR2 -will occur‘upon-fthe completion of
',tery'42ì'àii'dground'43. >It‘is notedthat battery
complete the desired call. The attendant's set
the circuit just traced'and it in turn will cause
60 may be connected to the calling station 2|
relay SLa to operate over an> obvious pathpro
merely
by inserting plug PL into jack JK. When
vided' by the armature andv make contact` of» the 60
this happens thecut-ofï relay CUa will become
linev relay LRz. Relay SLz Will connect ground
operated over an obvious path completed through
to the sleeve terminal of the-first selector» 38 and
theground
contact 6| of jack JK. Relay LRa
the line ñncler and first selector relay apparatus
vwill release in response to the operation of relay
As soon as the trunk apparatus. 25 atthePBX 65 CU2.. The_release of _relay LR: will extinguish
oilice. is seized byY the „callingporlîfyfslina ground
44 willbe connected to the _sleeveterminals
of the first selector 2_4 over a circuit which Vin
1_cludes the makefbeiore-brealr vcontacts associated
jwith._ themlovver _»-inner.__armature _ of ¿relay OP.
Moreover,¿ as_soonfasthe Aiirst selector 3sat the
central yoilice COis seizedfa circuit »Will be .com
pleted to theY operating YWinding of >polar relay
lamp LL, .but ground at the inner right armature
ofrenyi cue'wiuhoid relay CH operated.- The
PBXïattendant may then connect the calling
_ >station_to-_the central oñîce CO, but'the details
‘of the interconnecting circuit are not shown.
The latter circuit to the central _officeyCO may
be completed through jack >JK or through a sim
ilar
_ `It jack
~will multipled`
be clear that
thereto.V
upon the operation
i _oí__ relay
' ~
T. The latter circuit may'be traced to include _ .
OP
as
already'described
hereinabove,
-theï
trunk
ground‘43`, battery 42, they lower winding of line 75
5
equipment 25 at the PBX station will be released
so as tobe available 'for another call. At the
same time line relay LRz will be released and
ren-ts »so that-'such ¿currents wil-lno’t be absorbed
by Lthe bridging elements. The l'condense-r iK will
also act ‘to block the îflow of direct currents-»be
tween-the left »coil 'o'f impedance device>
and
relay LRz will in turn release relay SI12. The
»
equipment at the central ofûce CO will therefore UK the operating winding of -re-lay T. v
>With lthe above-described arrangement the
also be available ‘for another call. The release
local :calls by >the =calling station 2 I‘will reach vthe
of the trunk equipment 25 will also disconnect
central oiñce -CO through the PBX equipment
ground ‘M from 'the operating windinglof relayvT,
and may bepo'mpleted without lattracting the
whereupon relay T will release. Although relay
attention ofthe PBXoper-ator. Y Other calls, Isuch
T releases; relay 'OP and the 'first selector 24 will
be held Aoperated by -ground provided by the «ar-ma
as to‘ll calls, will »reach the central `olì’l‘ice ACO but
they will be automatically diverted to »the PBX
ture Aof relayjCI-I. Relay lOP' will be held -operated
attendantbeîfore they are Acompleted by 'the cen
until the calling Vstation `2-l has completed the
trai cnice operator.
Y
call. When the PBX attendant removes »the plug
While this 'invention >has been showt-rand »de
from jack JK 'or its `multiple,relay 'CUa will re
scribed ini-certain embodiments merely for illus
lease, thereby releasing relay CH as well as relay
tra‘tìv-e purposes, the general principles of this
OP. The equipment at the PBX station will be
invention may be applied to other and’widely
returned to normal and will now be ready for
varied organizations without departing Mfrom 'the
another call.
The relay T will be opera-ted when it is con 20 spirit ofthe invention' and the 'scope of the Jap
nected to battery '42 but Íwill remain unoperated
What is Aclaimed:
when it is connected to battery 32. This is due
l. In a lstep-by-ste‘p telephone system, the .conn
to the fact that relay T is <of the polar type and
will readily distinguish between oppositely vpoled
hina-tion oïf a l'dial telephone subset, aline to which
batteries 'such as'SZ and 42. Hence local "calls of
said dial vsubset maybe connected, a polarrelay
connectedv to said line, two v»orïipositely poled
the usual type will fail to operate the toll divert
ing relay equipment# at the PBX station, but
grounded batteries, means responsive to «a first
predetermined code y‘dialed by said subset to cen
other vcalls will operate the toll diverting equip
nect the positively grounded battery to said line,
ment 4 and thereby call in the PBX attendant.
said positively grounded battery being unable to
It is noted that the operation of the toll divert
ing equipment d will promptly break the circuit l transmit current through the winding of said
polar relay to operate said polar relay, means
between the calling station 2l and the central
responsive to a second predetermined code dialed
Ofr'lCe CO.
by said subset to connect the negatively grounded
Likewise, when the calling station 2l dials num
battery to said line so as to operate said polar
ber H2, the connection to the central oñice CO
will be completed by the same path as already
relay, and means responsive to the operation of
considered for the case when number 0 is dialed.
said polar relay to break the connection between
At the central office CO the path will then in
said subset and said line.
2. In a step-by-step telephone system, the com
clude the line iinder 2l, the line iinder and first
selector relay apparatus 28 and the first selector 40 bination of a PBX serving one 0r more dial tele
t8 to the recording completing trunk apparatus
phone stations within its area, a central ofñce
i2. The path through the latter apparatus I2
which may be connected to said PBX, a positively
grounded battery and a negatively grounded bat
will include the primary windings of repeating
coil 69, the windings of line relay LRA, >the ñla
tery at said central oiñce, a polar relay at said
ments of lamp LP, battery 62 and ground 63. The e PBX, means responsive to a ñrst predetermined
line relay LR4 will become operated, in turn op
code received by said PBX from a dial station
erating relay SLi. Relay SL4 will then extend
within its area to establish a circuit from said dial
ground to the lirst selectors 2Q and 68. It will be
station through said PBX to said central oflice
observed that battery 62 is of the same polarity
and to connect the positively grounded battery to as battery ¿i2 and hence relay T of the toll di 50 said circuit, said polar relay being connected to
said positively grounded battery but remaining
verting relay apparatus «l will be operated as soon
unoperated, means responsive to a second prede
as battery 62 is connected to the" tip conductor
T. The connection of the calling station 2| to
termined code received by said PBX from a dial
station Within its area to establish a circuit from
the central office CO will therefore be broken,
said dial station through said PBX to said central
but will be diverted to the PBX attendant’s trunk
circuit 6, in the manner already described here
oñice and to connect the negatively grounded
inabove.
’
battery to said circuit so as to operate said polar
relay, and means responsive to the operation of
Both batteries d2 and E2 are shown connected
to the tip side T of the trunk interposed between
said polar relay to break the circuit between said
the PBX station and the central office CO. This
PBX and said central ofñce.
is important for the connection of either battery 60
3. In a step-by-step telephone system, the corn
pended claims.
G2 or 62 will not operate the subscriber’s mes
sage register (not shown) on calls completed by
the PBX attendant. The reversal of battery 32
l
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'
bination of a PBX serving one or more dial tele
phone stations within its area, a central oiiîce
which may be connected t0 said PBX, a positively
cannot be used fcr‘toll diversion because such a 65 grounded battery and a negatively grounded bat
reversal would operate the message register
falsely and would, moreover, cause the equipment
to respond falsely to local calls. Consequently
tery at said central oflice,'a polar relay at said
PBX, means responsive to a first predetermined
code received by said PBX from a dial station
a separate battery, such as 42 or 62, of a polarity
within its area to establish a circuit fromV said dial
which is opposite to that of battery 32, is impor 70 station through said PBX to said central office
and to connect the positively grounded battery
tant in the practice of this invention.
to said circuit, said polar relay being connected
It will be observed that the choke coils TT are
to said positively grounded battery but remaining
bridged across the trunk conductors T and R in
unoperated, means responsive to a second pre
series with a condenser X. This bridging circuit
will present a large impedance to talking cur 75 determined code received by said PBX from ya
2,405,332
Y
dial station within its area to establish a circuit
from said dial station throughsaid PBX to said
central oflice and lto connect- the negatively
grounded battery to `said circuit so' as to operate
said polar relay, and means responsive to the op»
eration of said polar relay to signal the PBX and
to prevent the completion of any call from said
dial station through said central oñice.
4. In a step-by-step telephone system, the com
bination of a PBXserving one or more dial tele
phone stations Within its area, a central oiiice
which may be connected to said PBX, a positively
grounded battery and a negatively grounded bat
tery at said central office, a polar relay at said
PBX, means responsive to a first predetermined
code received by said PBX from a dial station
Within its area to establish a circuit from said
dial station through saidv PBX to said central
office and to connect the positively grounded bat
teryvto said circuit, said polar relay being con- i
nected to said positively grounded battery but
remaining unoperated, means responsive to a sec
ond predetermined code received by saidPBX
from a dial stationwithin its area to establish a
circuit from said dial station through said PBX .
to said central office and to connect the negatively
grounded battery to said circuit so as to operate
said polar relay, and means responsive to the
8
»
operation of said polar relay to break the circuit
between the PBX and said central oilîce and si
multaneously to signal the PBX.
5v. In a step-by-step telephone system, the com
bination of a calling station of the dial type, a
PBX to which the calling station is connected, a
central oiñce, a line having tip and ring con
ductors interposedbetween the PBX and the cen
tral office, a positively grounded battery and a
negatively grounded battery at the central oñìce,
a polar relay connected to the tip conductor at
the PBX, means responsive to a predetermined
code dialed by said calling station to seize said
line and connect the positively grounded battery
to said tip conductor, the polar relay remaining
unoperated when the positively grounded battery
is connected to said tip conductor, means respon
sive to another predetermined code dialed by said
calling station to seize said line and connect the
negatively grounded battery to the tip conductor,
the polar relay being operated when the nega
tively grounded battery is connected to said tip
conductor, and means responsive to the operation
of said polar relay to disconnect the calling sta
tion from Said line and to simultaneously signal
the PBX.
HAROLD HENRY SCHROEPPEL.
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