US1788007A - Telephone repeater system - Google Patents

Description

Jan, 6, 1931. H. H. ABBOTT ETAL `mLEPHoma REPEATER sYsTEu Filed Oct. 4, 1929 4 ,Sheets-Sheet l y GQ ik xmm Jan.6; 1931. H. H. ABBOTT ETAL 1,788,007

TELEPHONE REPEATER sYsTsl Filed oct. 4, 1929 4 sheets-Sheet. 2

HQE.

Jams, 1931.

Filed oct. 4, 1929 4. Sheets-Sheet. 3

n n Ur N -L BN m B f T Af r H5 A HF., QU .O m l Nw .V... W

VIII.

Patented Jan. 6, 1931 i i f i i the opaque SIGNOR CCO AMERICAN NEW Youn-AND SAID ENTZ k.s-sslefnoa To BELL TELEPHONE LABOBATQBIES. IN-

comonarnn, orenuwmomi, n.1., A'CORROBATIVON OENEW Yonai.v

i mELE2HoNE--REPEATER` sieren.

` 'Animation inea` october.11j, 19,29. Y seien.No.ae'aimvt e This invention relates to# signal-ing;k lar-- rangements for longe," org highly" attenuated? P. B. X.y tie-linesorinter-o c eVtrunkshavingl telephone `repeatersv or e other"fci`rcuits,

opaquejto direct current, included therein.

The object of lthe invention-f is. to increase the direct current signaling'rangeeflinesfofy this character. v

ik feature ofl theinventicn wherehyftlreabove object isfattained resides in 'an auxil-A laryl circuit including ar y p repeater channel connected to the line around;k

circuits, whereby direct [current y signals' applied to the; line at` eitherjexchange are repeated andxpassed around the` opague:

circuits to control' respective' Y signal'r` devices' at the other exchange.

The invention will nofivllie descriledivviths.

the aid of the accompanyingdrawings: e

VFigs. vl and 2 ofthe a ticdine circuit; extending between-itwowidely separated privatebranchexchanges, which circuitinclu'des certain intermediate equipterminating circuit ment, Fig. 1y showingv a Y K for Joining a tWo-Wireftoaffour1vv1re linea-nd another terminati-ng circuitiv for `joining a four-Wire line to af second two-Wire line` and' 2 `shows a two-Wiretelephone repeater b ass arran'dement inaccordance'with.

the present .invention which adapted," to

translate direct* current calling1 and rsupervvisory signals, originating at "Figs, 3 and' 4f when j placed togetherwith j F 14' at the! right, represent 1a'` tieline circuit extending [between ment, comprising a terminating circuit for joining tWovWire line toa four-Wire line,rg ak four-'Wire*repeaterv and composite circuitl e e u r d' nel and a-.telegraph nnpul'sei'ncomingover apparatus thereingjas/shown in Fig, van

. ment similu;` to Figs. kdirect current `sigrnils' aroundthe repeaters two-Waytelegraplrl drawing' W lienplacediv together, with Fig. 2` atthe'right, represent:

either B. X.,

into :standard telegraph impulses andto y transmit them, overanyv available'telegraph..not operate 'at'thls time. Y

closes, at its upper @We 1 Widely* Separated P'.Y B XFS', which includes intermediateequip v vit being suilicienttoj's other-composite circuitapparatus andA` a ter--l minating circuit `rfor joining-tha last named directly to anothentwo-Wire line; as shownin Fig-f4. Y

TheseJ7 figures (#3 and QjshoWl anvr arrange- `1I andx 21 yfor Icy-passing and terminating circuits', in lwhichethe'VL telegraph; channel ier-superimposed ony one'o" the telephone..lines'.` Fig.' 8! al'soshows arr-arrangement for bypassing direct current signals,` around theterminating 'circuit' which- -jcins'the two-Wirewithithe four-wireline. e

.Considering the arrangement shown 'by Flers.Y 'Land 2, We Will assumethe operator at' with BB. (Fig) over thearrangement shown-)1 ofthe tieline TD1, "whereupon battery flows kout `'overrthe tip and ringconductors of the tie-line TLln the well known ervisory lamp is Gonducters Vl manner. f The cal-lingY sup lighted' at this" time as' usual.

` and'A 2 are: bridgedacross theftie-line TLllr and serve te'ccnnect tlie;bypass- 'circuit tothe; tie-line andv therefore line- TLl Hows through the retard coil' 3, back contacts 4l and@ 5 of relay, liifghresistance 7 r and; the liighfresistance upper and low resstance lower windings of rela-518, where-V uporrrelai;Tv 8 lis'energizked and closes its eontactsto-'energize rel'ay9in anil obvious circuit; Due ,tothe highrresistance values of resistance 7 and the upper windings of 2 relay 8 the y 1 Newman, N. Y.; sainemaom'nfes# u i TELEPHONEsa/Nn TELEGRAPHQQMBANY, .A coRnoRNmoNfoE.

currentl from the 'Ati'e- PIB. X 'epeirators ycordV supervisory frelaydoee Y,

' Relay 9i in? operating contacts, thesending loop repeaterkfTRl' which causes S1 oftthe ytelegraph the repeater t graph channel.

Repeate-rs T-Rl', TR2; *TRB "andi are standardV telegraph, repeaters welll 'knowniintheart'and' 'a vdescription ofi their circuit are rangements and operation isnot necessary;

Atate ythat a closureofthe sending yloop Si? causes Qtelegraphgfimpulse Y tobetransmittedouti overfthe'ftelegraphehan Y the supervisoryylainp at thiswtiiiie. Opera Relay 12 the telegraph channel causes a corresponding impulse of direct current to be connected to the; receiving loop R1.

When relay y9 was energized ital'so opened l its contacts 10 fand closed its; contacts` A 1-1, thereby connecting the receiving loop R1 oi' thetelegraph repeater to relay 12, vvliich're` layfis thereupon in condition tofbeoperated whenthe operator at the distantfP'. B. X12.

answers the call. i

Y Returning to the transmission .of the tele.-V

graph impulse from repeater TR1, whenthis impulse is received at repeaterTR2' (Fig.2) fit causes battery and ground tobe connected to the receiving loop R2, which Vcauses the operationwoffrelay 13 ina circuit which Yin- .dudesv the i .upper .back AContacts -pf relay 14.-.

Relayal infoperating,'connectsat its innenv contacts battery'and groundjt'o thetie-line 'PL2 and thenceto B. X. 2 which .en ergiaes a,lirie relay `(not shown) to display asigiial before the operatortov indicate the call.

Relay 16,.'which is when lthe. operator answering supervisory Y,relay yoft-he cordwcircuit now operates and, prevents` lighting ot tion of relaylicompletes an yobviousV circuit to operate, relay 1'( iwhich opens,at its upper contacts, normal short-circuits acrossrthe.

repeater side ofthe transformers 1 5. and-.18',

thereby conditioning that yend of "the teleV phone circuit for talking.

Gperation offrelay 1T `also closes., its lower contacts, the sendingrloop S2 ofltele- .graph repeaterv TR2, which causes ai telegraph impulse to be sent yback over thetele channel toward 1, which' is .Y

TR1, -gvvhichA sends a `,corresponding impulse. offdirect cur--g rent' overthe 'receivingY loopjRl and .contacts 11 of ,operatedrrelay 9'to Yenergize relay'12.. .1in operating'connects lthe tieline graph y received by `telegrapli repeater through to the-terminating circuit 19,,closes Yto theV circuit of -the compromiseV network-.2O its lowerniost contacts, 4shunt-s .high resistancefand the upper, or high resistance, windingo relay 8, thereby lowering the` bridge resistance across TLl vto causejtli'esuper-visory ,relay `in the and, -at

release.; .Relay 13. inV releasing diesen- Y 1 of the supervisoryrelayofthe cord circuit n 2 andtheQcoiisequent.lightingfo vthe supervisory' lamp .to indicatetothe Aopera-, V

at P. B.

in theY battery circuit just referred to, is Qinarginal.andwdoes not operate in series with theline; relay bridged s acrossdTLh2. However,

answers, the Ybridged .resistance is decreased suiiciently to. cause relay 16st@ operate. The

. @ede-l0' 0f [relay p Vtelry andgroiindto .theI tie line TLl, through operators cord .circuit Y I X. 1 to operate, thereby ejatinguishing thecallingV supervisory lamp-which was, lighted when the operator plugged linto the .YP vfline; to initiate the call.'l

"operator-;disconn'ects, relays. 8, 9, 12,v and 17 'f nectsbattery -feed relay V16 from its-bridged,y A association Awith This causes'release tor at P. B. X. 2 that thel operator at P. B. X.Y l has disconnected. Relay v17, when released, applies short circuits to the repeater side of transformers 15 and 18, thereby disabling the talking circuit. f l

' In case the calling operator should imine'diately replug line TLl, before the operator at P; B. .X42 has impulse which would cause relay 13 to operate *againconnect battery and ground to thetie line TL2 toV again extinguish the fsupeivisorylamp of the cord circuit at P.

disconnected, relays 8 'andi 9fwould 'reope'rate to send another telegraph TL2rwrhicrh lights the supervisory lamp. at hei-(position andV connectsA battery and .ground to TL2vwhichy operates relay 21,

which in, turn operates relay 14 This relay closes at its lower contacts sending loop S2 otfthegrepeater TR2which causes repeater TR1 to .connect battery to there- ,ceiving loop .Rl toopferaterelay V6 over con- Relay 6 connects batthegwindings of vmarginal relay 22, to light hanne lampY apr yB X.

closes an ebyious circuit for. relay 23, which closes the"` vlcoinproiiriise network circuit l20, connects; the tie line. TL1 ,to Avthe terminating circiuit19, and atiits inner lower contacts closesthesendin loop S1 yof the telegraph repeater..T-Rl, wich transmits a telegraph impulsepyer theltelegraph channel to re- .peaterjl'R2Q where .battery is connected `to receiving loopR2 to operate relay 24,A in a circuit includingcontact V25 vof relay 14, which is operated at this .tirne.. Relay 2 4 in VoperatinguV shortcircuits lhe lower i( high resistance) windinguof relay 2 thereby decreasing the .brdeelesistence across TLQY-Suently t0 cause j operation ofthe:- supervisory relay .Y at

B. X. 2, and the consequent darkening of, the cordv I"supervisoryv lamp which indicates p Y l. Relay 22 being marginal does not operate until the called operator answers, at which time, however, it Y lli) thattlie.calledoperatorlias answered.` Relay n Mingperafti-ng also removes the, vnormal short circuits roinj `tliefrepeater, side. ofthe; trans- Y forine'rsil and. 18. ,Y .Disconnection by 4the Yoperator 2 releases relay 2 1 Vwhich in: turn, releases `relay VV14.- to..open the send- 'l'lhisreleases relay @which disire-1.091@ $12.

compromise network 20, and V'also disconnects the line TLl from the terminatingcircuit19.@ Release of relay 23 also opens the sending'y o lightsyas usual, andrelay4l operates thereby loop Sl to repeater From the foregoing in either direction in the usual manner, these` signals being repeated and transmitted, by

.. yineansof a telegraph repeater system, around 'the intermediate equipment without aifectin'g it or'being affected thereby.

The tie line circuit connecting P. B. 'X'.

with P. B. X. 4 (Figs. 3 and`4) is made upof is connected to the rfour-wire 'line through-a terminating circuit 30 shown Within'fthej lbroken line rectangle L0L. A four-Wire f repeater31-is insertedbetween the terminals of the four-Wire line, and a our-wire terminating circuit 32 serves to connect the fourl connects battery andground tothe receiving.- `loop R4 which causes 'thefoperation of relay wire line to the two-wire line TL4.

In the present caseV the telegraph repeater perfectly obvious from'an inspection of the drawing. 4 Y f` Theintermediate four-wire telephone' repeater, and the telegraph repeaterfTR3' to;v Vgether with itsv associated equipment,l are` shown enclosed Within a second broken line'y I); l o f telegraph'impulse to ybe sen-t backove-r the telegraph channel to repeater 'TR3-*which The other endfof the-/fou'r-wire circuit is 2joined to the two-wire line TL4 at which telegraph yrepeater o i receiving loop R3 `which Vin turn operates repointthe other end of the channel is located. 1 Y

The telegraph" repeater channelin this in-ff' stance is a composite circuit formedbyf the "f two conductors of one side of thefourwire The operation ofthe telegraph repeater by-p'ass arrangement, as shown in Figs. 3 and 4, is substantially the same as previously described.

When the operator at P.' B. 3 plugs into TL3 battery from the ring conductor of TLS flows over lead 33 through theyreta'rdation coil 34'to Vthe mid-point of theright-hand winding of transformer 35, over the two con-- ductors of the lower pair of wires'in parallel teV the mid-point ofthe left-hand winding of repeating coil 36, thence over conductor 37, contacts 38 of relay 39, high resistance 40,

v"cothwindings of relay 4l in series, contacts description, it lwill be understood that the l?. B. X. operators signal 42' Greeley 39, Conductora to the .midpointof the--left-/hand winding of- `transformer 44 and thencefin .parallel over both conductorsv of theupperiside 'of the fourwirej line. tothe mid-point kof the right-hand winding oi' transformer 45. F rom this point thecircuit passesover conductor 46 and retardation coil 341 to lgroundsonf the tip conductor of TL3.v

`.T.hef operators cord'v supervisory Alamp completing an obvious circuit to operate re-4 layf47zf Due to-thexhighvalues of resistance 'zov 401 an'dL :the-lower windingof lrelay 4l the supervisory'relay inthe operators cord cir` cuit-'(not shown) doesnotV operate at this time.

'. `Relay 47vin' operating closes, at its lower contacta-the :sending loop S3 of thetelee phone .repeater TR3 which causes the repeater to Y.send-a' telegraph impulse over the telerv graph channelgincluding both conductorsfof one-halt ofl the"fourwirecircuit; Y JRela-y!` '47, in operating, .alsofV connects the receivingloopR3 to relayf48thereby conditioningV that relay for operationwhen the operator atyPpB. X. 4 answers.v

The'telegraph impulse following operation of relay 47 is received byrepeater TR4 which 494119 'Circuit-Which includes contacts 50 ot relaylp'f 'Relay-49, in operatingl connects battery andi ground,throug`hthe windings of relay 52,"

thetie line TL4.` Thislcauses the usual line signal to be lighted before the operator. Relay52` is marginal and doesnotoperate until the operator answers, atwhich time it completes lla' circuit for operating relay53 which clo'se's' the circuit 'of network 54, connects the terminatingcircuit32 to the` tie line`TL4`and,

at itsupp'erin'ner contacts', closes the sending loop S4 `of theV repeater TR4 which Vcauses a translates it into a direct current impulse over lay48. 'Relayl 48-opens, at its upper and low'ermosty 1 contacts,- normal short-circuits across' the input y'circuits ofA the four-wire rely peater 3l, thereby "conditionin'or the repeater for talking, yand closes atits inner lower con- "When thecallingoperator disconnects,`rfe" l lays 41, 47, 48,' 49', 52"and `53 release. Relay` 49 disconnects battery andl ground from they tieline TL4- which causes release of the cord and extinguish-tha l supervisory relay and the consequent lighting 'ofthe supervisory lamp at P; B. X. 4. Relay 53,kv released, Iopens the circuit of network 20,

disconnects TLftfromtheztefmiDtngcrnutf.

32and opensthe sendingfloop Sft-,whiclicauses relay 49'- whichv again connects; ,fbattery and ditionfroln the repeater-31.-

ground to the tie; line Tl'iftozagainxextnf.; fruish j the supervisory 'lamp at 1P; .BLQ- i Y velay- 52 -will reoperate inthis .cincnitaandf causerelay 53 to operateitoagainconditionY Vthe, -circuit for talking.; Relay f.'53-fcauawsit8- toV operate which removes the disabling con-f relay 54 which operates relay-151 which:semis:` p an'. impulsejto. the; other; end :of thefte-legzl'aphn -hannelgito :operate .relay 59; Relay 39e-icone.; nects battery 'and .ground 'to' conductors I and 43 in seriesfwithadouble'fwound:relayiL When theoperatorfatfl?. B. X..31Lanswers,

relay 55' operates which completes@ circuitxto energize relay :5 6l which 'removesftheinorrmal Y short-circuit acrossfthesinputiofirepeater and `closesrtlie; sending :loopdl S3; -Whichfcauses an impulse `t0'-be.` transmitted- :to IR4 iwhich in turncausesfrelayf57zto!operate.j f'llhisicloses the:networkzcircuitlaanidrconnectsftheltermif; 1 nating circuit 82 atofftlie' line TD4; Relay 57,- in operating also shunts ,the resistance, 'and-i the upper (highresistancei), 1windingiof relay 54. Thiscauses thewsuperni'soryflamp 1:12.; f a Bra-..4 to "be extinguished-.l1 A Y l W hat isclai'med is:

with a line extendingfbetweentwoexohaitges and*` having circuit arrangementsincluded v thereinwhich are#substantially-.opaque-toldie rect current,l .ofanauxiliary r-ciircuitf :for :ref

laying f direct Y `current line f and f :supereuisoiy 2 signals around :said 'opaqnev \c1rcn 1ts;aniboth; directions, said :auxiliary oircuitquncluding two twolway telegraph`v` repeaters intemilfbY neoted by agtelegrraph-channeh p. y 2. VInga Vtelephone system, A`in combination Vwitlra'line extending-.between twofexcharxges J and.;-liayingdg`v circuit arrangements g-substam, tially opaqueto direct current includedther'e.-`

' our names this in, an auxiliary 'circuit ionrrelayingdirect current line and supervisory Vsignals,around g said kop aque circuits iin both adireetionsrrsaid auxiliary `circuit comprising1-lftwor1 two=way fr 1 telegraph repeaterseinterconnected#aya d;e1e graph channel, rone ofVsaidl.repeatersbeing,A associated with -Saidj line througlli-'leyfmelS-f intermediate thelopaque circnitslandfnnefexfs change and the other repeat-3er: with; the line fthrougl'i r'elaymeansiintermediatetheeopaquei p Y circuits zand-the otherexchange.VV p

lil*iefextreriding4v j between two exch anges .fha-ning @its terminals arranged-fior direct Current signaling-inlbethz, l v directions `:and including- Y :o111c u1t =,Y .armangeef insegner mentsf'snbstantially op aque to direct current; an ,auxiliary circuit-including :two two-way telegzmph vrepeaters and a-n 'i terconnectingtelegraph frchanneltherefonand means, associatingsaid line and fiepeaters to Acause direct currentesignals -applied'to saidV lineat one exohangefto beitranslated into telegraph sit; nals `byzone frepeatenand` transmitted over said l channel, :received a and 'retranslated into direct current signals by the-other repeater to 1 actuate the signaling apparatus at vthe otherexcha'nge. f

Ineatelephonefstgnaling system', two ex- Changes, a v-linelinterconnecting them having interposed circuit arrangements substan- Atially aopaque to :dire'ct -f.curr ent,4 a direct \current signaling deviceassociated with said linevpat each exchangeyanoperators link cin cuit. at cache-Xchange adaptedY to be Iconnectf. ved-Ato,-saielfline, asource of? direct currentat eachexchangeifadapted ,tohe connectedto said line irunderfnontrol' of yits lrespective ylinl circuitca circuit including 'a plurality.- ofV tele-Y graphirepeaters, one end offsaidcircuit being. connecte-,dato said line between one exchange and thee Aopaque circuits, Land the other vend between AVthe-opaque ,circuits andthe other exchangey and meansV in said e'circuit :between said line and said repeaters to -cause :direct currentrappliedtothe line. at either exchange tolbe translatedinto telegraphfsignalsby one repeater-.and transmittedto a secondfrepeater,

andfother means betweensaid line and :said

repeaters responsive' to the-reception gof telegraph-xslgnals Ylo yfe1the'r repeater to connect p j directfcunrent Yto said linejto operate -one of l. In La 4telephonesystem,` combination saidasignalideyices.

.5.V V'In .a :telephonesignalingjsystenn.,.two i exchanges, a line extending therebetweenvim cludlng f c1rcn1t arrangements substantially Y opaque ito direct \cunr'ents, means at Veach vof said exchanges fontransmitting toand re-l ceiving :Eromsaadline direct' current lline and supervisory.A signal ',impulses, and means -including telegraph .repeaters zand ran intercon` nectingstelegijaph@cliann-eljthereitor tol relay Y said direct' current signals around said opaqueecircuit Aarrangenients inA bot-h fdirections.-Vv f v g Vi .Y

' .In witnesswhereot, we yhereunto.subscribe lst day of October, 1929.

" IEERDINAND S.. .ENTZ

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