Патент USA US2276489код для вставки
March 17, 1942. R..HOEFERT ET AL 2,276,489 TELEPHONE SYSTEM Filed June 13, 1940 5 Sheets-Sheet 2 rá Vd `/~v£N-roe REmHoLD uoEFERT and Konsrnurm sermone-R HT?oE/#EY March'17, 1942-s 2,276,489 R. HOEFERT ET Al. 'TELEPHONE SYSTEM 5 sheets-sheet> 5 Filed June l5, 1940 „w „w/. n _/ ,/ r u n»» [email protected] w _M M 1_fY ,MM.„o |I\[‘.I|liìî ä... w..„d.. .`0...„„. m à@ mi [email protected] œ M ,we «w H wf #a mz [email protected] _ _m cw [email protected] cw/ m c; ß . . w m ,oM ww. ,n w I.. .w *.w . @my [email protected] [email protected] @W/ »y c” w .w „W „6, , m 1, v @ya ,yz/c /NvENrae REmNoLD NoEFERr and . P oNSTANTIN SUMMER . Z. ¿4' ,4v-faena’ March 17, 1942. R. HOEFERT ET AL n2,276,489 TELEPHONE SYSTEM Filed June 13, 1940 5 Sheets-Sheet 4 March 17, 1942. R. HOEFERT ETAL 2,276,489 TELEPHONE SYSTEM Filed June 13, 1940 5 Sheets-Shee’rI 5 Patented Mar. 17, 1942 UNETED STATEÈ PATENT- OFFICE 2,276,489 TELEPHONE SYSTEIVI Reinhold Hoefert, Berlin-Gatow, and Konstantin Schröder, Berlin-Staaken, Germany, assignors to Fides Gesellschaft für die Verwaltung und Verwertung von gewerblichen Schutzrechten> mit beschränkter Haftung, Berlin, Germany, a corporation of Germany Application June 13, 1940, Serial No. 340,294 >In Germany May 16, 1939 ` 4 claims. (ci. 17e-1s) The present invention relates to improve ments in >telephone systems and more particu larly to a circuit arrangement for multi-ex change telephone systems the exchanges of which are interconnected in dilîerent ways. Thus a call can be set up over the various junc peater is not at the sole disposal of any one con necting device in the exchange in question but .is provided in common for several connecting de vices, it must determine by which of these con necting devices it has been seized in order that the selected free line should be connected With tion lines provided or over dilîerent exchange that connecting device seized by the correspond stations. ing calling subscriber. The latter is, for example, the case . if as Well as junction lines between the toll ex To this end it has been proposed to mark the changes or between the rural main exchanges 10 toll exchange or partof the toll exchange marked and the associated toll exchanges so-called tie by the calling subscriber’s initial numerical se lines are provided between rural main exchanges lection in the code vrepeater by means of a relay and other exchanges of the same or of another and to determine the connecting .means used toll area over which traffic may be developed. - thereby by by-path testing in dependence on the The required exchange station can then be 15 access seized by the code repeater. Since the reached from the rural main exchange for ex code repeater is adapted for common use by Sev ample over the junction lines leading to the toll eral connecting devices, hunting has very often exchange erover tie lines. n to be carried out by several code repeaters simul In order to maintain the junction lines to the taneously and precautions must be taken to pre toll area exchange free, especially if traine to dis 20 vent cross-connections in the b-y-path testing. tant exchanges is concerned, in the event of con This is attained` therein that a step-by-stepv nections which may be made over tie lines pre cautions are taken that the seizing of a high valued junction line is only possible if no tie line is available for building up the required con nection. For this purpose code repeaters are provided at the connectingmeans available to the calling subscriber which receive the numer switch mechanism closes the test circuits for the individual code repeaters one after the other so that at one time one testing operation only can' take place. This switch mechanism can, hoW ever, only operate with a, limited speed since the selector of the code repeater determining the seized connecting device must traverse a large number of contacts during each operation of the ical impulse series transmitted for marking the required direction and determine according to 30 switch device. the said signals whether tie lines 'are available According to the following invention the de in the required direction in order that, if nec termination of the toll area selected by the call essary, a free line of this kind should be switched ing subscriber and the connecting means seized to the connecting devi-ce seized by the calling for this purpose is simplified and false operation subscriber. According to Whether this line leads 35 is prevented. rThis is attained therein that directly to the required exchange station or at switch devices are associated with the code re ñrst to another exchange station over Which the peaters, to the contacts of Which are connected required connection can then be set up, a certain the connecting devices used by the code repeater number of the stored numerical impulse series in groups according to their traino directions and are sent out from the code repeater. I1" it is de also singly so that by the setting of the switch sired to prevent the code repeater being taken device simultaneously the >signal selection and into use when connections are set up within the setting up of the connecting path to be repro rural main exchange connecting means must duced by the code repeater according to the di- , be provided the seizing of which is only under rection of the seized connecting device is deter taken after the selection of one or more numeri 45 mined-and the connecting device connected With cal impulse series by the calling subscriber so the selected connecting path is also determined. that the code repeater must determine the nu An embodiment of the invention is Aillustrated merical impulse series sent out before its seizure in Figs. 1-5. Fig. l isa schematic networky lay in order to determine the path to »be used and, out of a multi-exchange area With a number of if necessary, to be able to transmit the impulses 50 connecting paths, While >in Figs. 2 and 3 a sec according to the path which is chosen for the- tion of the rural main exchange (NHA'IZ) is connection. The code repeater must, therefore shown attainable by a calling subscriber over a determine which toll exchange or which part of connecting means Uel2 to-which a code repeater the tollexchange has -already been marked by the (e. g. KZ!) common to several connecting de calling subscriber. Further, since the code re 55 vices may be connected over a connectionselec 2,276,489 2 _ necting lines (S, A, B, C) to the connecting the further impulses transmitted from the ca1l~ ing subscriber consisting of three and five im pulses by setting the wipers (12B-(122 and means. tor (for example AW2). The selectors (Ws, Wa, Wb, Wc) are shown for connecting the con In Figs. 4 and 5 a code repeater (e. g. d3û-d3l; if necessary then a further impulse KZI) is shown with the selectors necessary for its diiîerent functions and the signal control relay. Battery and earth are omitted where they series is received by setting the wiper d_dël. By a corresponding setting of the m20-m26, m3|-m36, m40-m46, m50-m56, and 1160-1162. are not necessary in order that the invention ybe « the junction line available in the required direc tion is determined, the chosen line is connected with the connecting means Ue|2 seized by the calling subscriber and, according to the line con~ nected, determines how many impulse series are explained to simplyfy the drawings. The setting magnets for the selector with the associated re vertive relay are not shown in order to explain more simply the operation in question. The con tact banks of each signal selector are shown to be sent out from the code repeater KZI, schematically in order to keep the circumference determined by the setting of the wiper d50, for of the selector within a reasonable space; and reaching the required junction centre KA|35. a limited number of wipers are shown in the The switch operations described above take given embodiment. For the selectors in Figs. 4 place in detail in the following manner: and 5 with the reference “d” step-by-step selec After the group selector GW in the rural main tors are used and for those with the reference exchange NHA'I2 (Figs. 2 and 3) is set by the “m” motor selectors are used; naturally other 20 numeral 1 on the decade l, it hunts for a free types of selectors may be used. connecting means. If, for example, a connecting `.In Fig. 1, two toll area exchanges are shown, means Ue|2 connected to the contact 2 is reached BAI ,and BAT, to which rural main exchanges, a circuit for the relay C is completed over the for example NHA12,-13, 'M or NI-IA|2, I3, |`4 are test conductor over the corresponding c-wiper connected. To some of the rural main exchanges which by connecting its high resistance winding are 'connected junction centres, for example II over the contact | c holds the connecting means KA`|2|, 121|, or Iii-U33, |34, |35 from which iinal locked against further seizing by another group exchanges, e, g. EA'Z24I, 72132, 'l2-'i3 or EAI35I, selector. The connecting selector AW2 asso |352 branch off. ciated with the connecting means Ue|2 is pre The connecting means Ue|2 shown in Figs. 2 pared to be connected With a free code repeater and 3 with the associated selectors Ws, Wa, Wb, e. g. KZI and the relay T of the hunting switch Wc, is like the code repeater KZI shown in Figs. AW2 is energised over: earth, battery, Wz’S (Fig. 4 and 5, provided in the following example in 4), contact |3cl, conductor I, wiper a2 of the ' the rural main exchange NHA'IZ. From this ex hunting switch AWZ (Fig. 2), Wz'3, contact 3t, change are connected so-called S-lines to the as- “ sociated toll area exchange BA1, which is con nected over junction lines with the toll area ex change BAL Also between the rural main ex change NHAIZ and the toll area exchange BA| A-lines are connected, between the rural main 40 exchanges NI-IA12 and NI-IA|3 B-lines, and be tween the rural exchange NHA'IZ and the juno» tion centres KAI33, |34, |35 C-lines. Between the other exchanges likewise different junction Winding II of relay T, earth. After the closing of the contact Scl, relay P (Fig. 2) and relay CI (Fig_ 4) are energised over: earth, battery, Wil, winding II of relay CI, contacts |502, IGsp, con~ ductor 2, wiper b2 of the hunting switch AW2, windings II and I of the relay P, contacts 12T. lla, 6c, earth. The relay P, when its high re« ‘ sistance winding I is short-circuited over con tact lp, locks the code repeater KZI against seizing by another hunting switch. By closing lines can be connected in any preferred manner. 45 the Contact 8p the impulsing relay Al of the The S-lines are lines which end at an S-group code repeater KZI is connected over: Wiper c2 selector for .selecting a toll exchange. The of the hunting switch AW2, conductor 3, relay A-lînes end in an A-group selector which pro Al, contact MCI, Wiß, battery, earth. By the vides for the selection of a rural main exchange. closing of the contact 9p the circuit over which The B-lines lead to a B»group selector which 50 the code repeater KZ! transmits numerical im provides for the selection of a junction centre pulses is prepared over the wiper d2 of the hunt while the C-lines lead to a C-group selector and ing switch AWZ and the conductor 4. are provided for the selection of a final exchange.A In the code repeater KZI after relay Cl is From the network layout shown in Fig. 1 it energised the associated contacts are operated will be seen that a calling subscriber belonging 55 so that relay C2 is energised, contact 2|c| closed to the rural main exchange NHA'IZ may reach, and relay CI is held energised over its series for example, the junction centre KA|35 over the Winding III. Further, after the code repeater S-line to the toll area exchange BA1 and then KZI is seized, the selector provided with Wipers over BAI-NI-IAIS, or over A-line to the toll mill-mV! is set in motion, in a manner not of area exchange BA| and `then over NI-IA|3 or 60 interest in this invention, in order to determine over B-line to the rural main exchange NHAI3, the seized connecting means Uel2. The selector or directly over the Celine. The marking num is in motion until its wiper mlû reaches the con ber for access to this junction centre is 135 and ductor connected to the contact 2. Then the the ñrst ñgure l serves for setting a group se relay Pl is energised over: (Fig. 2), earth, bat lector GW in the rural main exchange NHA'lZ tery, Wz‘S, contacts 151', |2p, wiper f2, conductor on the ñrst decade, in which a free connecting |2 (Fig. 5), wiper mlû on contact 2, relay Pl, means is hunted e. g. the connecting means Ue|2 contacts 2|q|, 22cl, earth. The relay PI is thus connected to the contact 2. To this connecting energised when the selector is stepped-on to device (of Figs. 2 or 3) a free code repeater e. g. the second contact; in a manner not shown here, KZI is connected over a hunting switch AWZ. ’ further stepping by the selector is prevented. Wiper mll set with the wiper mIU marks, in the contact bank which it traverses, the connecting This code repeater which is shown in detail in Figs. 4 and 5 repeats the marking number already received from the group selector GW (the num ber 1)’ by setting the wipers dIIJ--dlS according to setting of the wipers mIU-ml'|; it receives means Ue|2 by being set on the second contact. In this contact bank, however, contacts are mul tipled according to the number of connecting 2,276,489 means required in the corresponding direction. To simplify matters two connecting means are providedin the direction I in the present ern 3. on the contact 3, the two selectors with the wipers mim-m26 and m30-m36 are in motion ~ until the wipers m20 and [email protected] reach the contact I 3. The relays P8 and P9 are energised over: Cl wiper m29 or m39 on contact I3, multipling, bodiment. After the relay PI is energised, the relay QI is energised over the contact 2311i and holds it wiper d`2ll on Contact 3, contacts d2u2, 43415, and self Íenergised in a holding circuit over its con No2. The relay QQ is energised over the con tacts M115, 435119,[email protected] and 47:12 and is held ener gised over its contact Tlqd. II"he relay Q5 is rc 10 stored by the short-circuit over the contact tact Zâlql. Moreover, depending on the control relay, not shown, the selectors with the wipers mGÜ-mêâ and mtg-_m56 are set in motion un til the wipers mail and m50 reach the contacts marked by the wiper ml I. When the wipers m40 and m50 are resting on the contacts I, the relays P2 and P3 are energised over: relay P2, wiper »fi-8c4. A further setting operation of the two selectors is prevented. In the Contact banks of the selectors which are swept over by the wipers m2I-m26 and m40 on contact I or relay P3, wiper m50 on con m3I-m35 are contained all the possible con tact I, wiper 'm'I I on contact 2, contact 2502. Apart from the setting of these selectors, after nections in the main and tie directions. The con tacts which may be reached by these wipers are relay QI is energised, in a manner not shown multipled in a deñnite manner with the con here, the selector with the wipers dill to £155, is tacts attainable by the wipers mill-m46. Ac cording to theabove description, for example, vthe wipers m40-m46 corresponding to the groups of stepped-on until the relay Pfl is energised over I the wiper dll? and the contact marked by the wiper ml I. This also takes place when the switch has taken one step. The next numeral the seized connecting means Uell are set on the contact I while the wipers »12d-m26 and [email protected] m36 are stepped corresponding to the first two is thus determined. The multipling between the steps of the wipers dit] and mII is-so selected 25 impulse series (l and 3) «and are set on the con that the number to be transmitted is the ñrst tact I 3. place of the marking number and is also the In the circuit given in Figure 3 it is assumed number of steps which the selector with the that for the direction characterised by the three wipers cZIIl-dlâ is distant from its zero position. impulse series (I, 3, 5) the following possible rî‘he ñrst impulse series is subsequently routed 30 connections may obtain: over the wiper dlr: set cn the contact i, and is IC-direction according to the numerical selection 185 transmitted by the selector with the wiper (15d. B-direction according to the numerical selection 13 After relay Pd is energised, the relay Q2 is A-direction according to the numerical selection l energised over the contact ìßpê, The impulsing relay AI of the code repeater KZI receives the e S- direction according to the numerical selection l further impulse series transmitted from the call The corresponding contacts I3 are therefore ing subscriber over the conductor 3. By the next connected with the contact I of the contact bank traversed by the wipers mtl to mdc in the man impulse series the selector with the wipers ner shown. ¿2li-0123 is set and, since the next impulse series consists of three impulses, reaches the contact 3. 4.0' The multipling for the other directions is Hereupon, in a manner which is not shown, carried outy according to all the connections switching over takes place so that the third im pulse series (5) is transmitted from the relay AI to the selector with the wipers (E38 and däl. If necessary a 4th impulse series is subsequently transmitted to the selector of the wiper ddl). In the present case all three possible tie lines (A, B, C) are determined by the first three irn pulse series. v The relay Q2 energised over the contact 25nd after relay P4 is energised during the determina which are possible. As shown in Figure l, three rural main ex changes NHAIZ, NHAES and NEL/«lill may, for example, be connected to `the toll area exchange BAI. In this case then the contacts I2 to Id in the contact bank traversed by the wiper mZI are connected together and, since the toll area is associated with the group I, one step is taken by `the wipers míl‘ll to m65 wired to the ñrst contact of the contact bank traversed by the wiper mill. If other A-lines are provided, in the contact bank traverse by the wiper m22 the contacts Y I2 to Ill should be connected and multipled with 55 the ñrst contact of the contact bank'traversed tion of the iirst numeral (l) connects the selec tors in a manner which is not shown, with the wipers 1MB-m26 and „Z39-_m33 in an auto matic stepping circuit. They are stepped-on until the wipers m2o and m38 reach that con tact which is marked by the wiper dI I set on the contact I. The test relays P8 and P9 of thesetwo selectors are now -energised and stop the selector. The energising circuit is completed 60 by the wiper mil-2. This applies similarly for the B and C lines. ~ As shown above the relay Qd is energised in the present circuit after the wipers m20 to m26 and mSI to m36 are set. The wipers d‘àû to -dß2 over; relay P8, wiper m28 or relay PS, wiper are stepped-on in any known manner. [email protected] on contacts II, multipling wiper dl I on con as contact 2 of the wiper dßll is reached the relays PII) and PI I are energised in series over tact I, contacts 35u2, 36u3, and MC2. After con tacts Sêpß and 38229 are closed, relay U3 is ener gised over: contacts 31o/5, 38179, 39138, llllq2. Re As soon contacts 52c2, 88N, 5IqfI, relay PIIB, wiper d50 on contact 2, wiper m45 on contact I, wiper m32 on Contact I3 U35), wiper d3l on contact 5, con lay U3 breaks the circuit for the relays P8 and P9 at 3Su3 so that the two selectors are again tact SM2, relay PII. Over the contacts ß‘IrI, switched in. 53pm, the relay PI2 is connected to the wiper « In the meantime, by the closing of contact dSI. Since the wiper dñl. is set at Contact 2 and 43o/5 a new test circuit is prepared over the wiper 70 the wiper m55 on the contact I (conductor oc) dîil, for, after the second impulse series from it can energise as long as a free C-line is avail the calling subscriber setting this wiper the re able over the conductor vc. In this case the lay Q5 is energised over wiper (123. relay PI2 is energised over: contacts S'Irl, 53pm, Since in the above case this impulse series relay PIZ, wiper cZGI on contact 2, wiper m55 on consists of three impulses the wiper d2!! is set ’contact I, conductor> vc, contacts 54120, 55mc, 4 2,276,489 relay Bc, battery, earth. In this circuit relay Bc is also energised and by closing its contact 565e the rotary magnet Dc of the selector Wc is con nected over the contact 5'Imc. This selector is in motion until the relay Mc is energised over earth, contacts 59120, 58bc, windings II and I of the relay Mc, wiper dc, conductor dc (Fig. 5), wiper mI6 on contact 2, wiper 1162 on contact 2, ing c-conductor (vc, vb, va, vs) a corresponding selector (Wc, Wb, Wa, Ws) is started. Over the Wipers £162 and mI2 to mI'I the d-conductor (dc, db, da, ds) is marked corresponding to the connecting device on which the corresponding selector must test. As soon as Vthis occurs the relays R and RI are energised as shown. The test circuits for the relays PIII and PI2 are broken at the contacts 81H and 88H. Moreover, contact BûpIZ. In this case the connecting de vice UeI2 seized by the group selector GW to 10 the transmission of the impulses by the code re peater (KZI ) may begin. According to the path which the free C-line is connected is connected (C, B, A, S) over which a connection is to be over the selector Wc. The relay Mc by opening contact 5'Imc prevents further operation of the rotary magnet Dc. Relay NC is connected to the developed the marking number 135 is completely or partly absorbed or completely transmitted. If for example a C-line is seized the complete wiper c of the selector Wc over contact Slmc so 15 marking number 135 is absorbed; only the 4th number which sets the wiper 0140 is transmitted. As described above the relay PII is energised of the selector Wc, relay R, contact 181', wiper e2 after a C-line is determined; it holds itself ener of the connecting selector AW2, conductor 5 (Fig. 4) winding I of the relay RI, contacts 20 gised further over the contact 89p| I. By clos ing the contact 9IpI I, a contact is immediately 'I9pI2, 800|, earth. In this circuit the relays R marked in the contact bank traversed by the and RI are also energised. Conductor 5 is dis wiper d50 which corresponds to the setting of connected by the opening of the contact 18T. the wiper dIIIJ sothat the wiper d50 can take up The holding circuit for the relays Nc and R is now extended over the contacts 13T, 'IIa and 5c, 25 this setting. When this is accomplished the relay P'I is energised over: wiper d50, multipling, while relay RI (Fig. 4) is connected in a hold wiper 1140, contact Iûûul, relay Sp, contacts ing circuit over its winding II and the contact 9IpII, 92pI2, 9302. Further switch operations 82H. By the closing of the contact 641m the are described further on. connecting device Ue|2 now connected to the If, instead of a C-line, a free B-line is seized, selector Wc is locked, while by the closing of the 30 relay PI3 is energised after this B-line is se contacts 62nc and 631m the speaking conductors lected and a holding circuit is completed over the are switched through. By closing the contact contact I43pl3. Over the contact IMpI3, con 65nc the relay Vc is energised so that the relay tact 5 in the contact bank traversed by the wiper Mc is also held energised over its winding III and the contact 680e. When relay Vc is ener 35 d50 corresponding to the setting of the wiper d3() (3rd dialling of the marking number) is gised the seized C-line is disconnected from the marked so that the wiper d50 takes up this set conductor vc by the opening of the contact 54110 ting and thus, as will be explained later, can and this conductor is switched on to the next free transmit 5 impulses. In this case the numbers C-line by the closing of the contact 100C. By the closing of the contacts 83T and 84? the con 40 1 and 3 are absorbed. If a free A-line is seized, instead of a B-line ductors a2 and b2 in the connecting device UeI2 the relay PI4 is energised and a holding circuit are switched through and by the closing of the is completed over the contact I46pl4. Over the contact 85H (Fig. 4) impulse transmission is contact I4'Ipl4 the wiper 412| is connected so started as will be explained later. ' If a free C-line in the marked direction (135) 45 that its sett-ing (on Contact 3) is taken up by the wiper S56. In this case only the number 1 of the is not available the relay PI2 cannot be energised marking number is absorbed. over a corresponding inc-conductor; the wipers If an S-line is seized, the wiper dI5 set on the dIìI) to e162 are stepped-on until Contact 4 is contact I is immediately connected since the con reached. When relay PII) is energised the test ing of the availability of a free B-line, corre 50 tacts I5Ic2 and I50pI2 are, as in the above cases, closed. The wiper d50 thereupon takes up the sponding with the testing (C-line) described setting of this wiper dI5 and no numbers are above, takes place over the conductor vb. If a absorbed. free vb conductor is available, the correspond-The actual stepping-on of the wiper d50 when ing relay is operated as for the seizing of the free C-line, the selector Wb is set on the con 55 taking up its position for the purpose of impulse transmission takes place by the well-known a1 necting device UeI2 and the connecting path is ternating reciprocal interaction of the relays I switched through. and K when the contact 85M is closed. The con If also no B-line is free the wipers dßû to «162 tact I9i transmits the impulses over the conduc are stepped-on until contact 5 is reached. When relay PID is energised the relay PI2 tests over 60 tor 4 and the wiper d2 of the selector AW2 over the connecting device UeI2 while another i-con the conductor va. whether a free A-line is avail that the relay is energised over: C-line, windings II and I of the relay Nc, contact BImc, wiper c able and if this is the case causes the selector Wa to be set on the connecting device Uel2 in a man tacàt operates the magnet, not shown, of the wiper ner corresponding to that described above for If it is assumed that an S-line is connected d5 . the C or B-lines. 65 with the connecting device Uel2 over the selector Ws the whole marking number 135 is transmitted If no free A-lines are available the wipers as described above. The number 1 is marked dëIl-CZBZ are stepped-on until they reach the by the setting of the wiper dI5 on the contact I, contact 6 over which the availability of an the number 3 by the setting of the wiper dZI S-line is tested. If a free S-line is available the on the contact 3 and the number 5 by the setting selector Ws is correspondingly set on the con of the wiper (130 on the contact 5. Since now necting device UeIZ over the conductor Us and is set according to the conductor ds marked. It is understood that over'the wipers dGI and m5l the different groups of lines are tested to see if they are free so that over the correspond 75 only the relay PI2 is energised and not the relays PI I, PI3 and PI4 only the wiper dI5 is connected; by being set on the contact I in the contact bank traversed by the wiper d50 it marks the contact 2,276,489 Yl A'so'that after 'taking >one Vstep ‘the wiper vd50 connecte'd‘ipr‘ transmittin'gian impulse, is stopped 4since the‘relay `P1 is energise'd’and the relay I The wiper d50 is thereupon returned toits resting position by an interrupter (not shown). :Relay'iPl‘li is energised ‘ is disconnected `at >contact l51p1. 5 however, so vthat 'theV circuit. described is broken at the'contact I51u3. The wipers m20-m261and mSEl-mSö‘are operateduntil the contact ‘13 is reached, since this Contact is marked by .the‘wiper ¿H2 set by the wiper all-3. Theirelays P8 and P9 are again energised. If, later, the numbers to be sent out by the wiper 'd50 are determined the over its"winding II in >serieswith the relay P1 so 'that `the wiper ‘dl'ä Ais disconnected at contact first number ('1) is so formed that lthe relay P1 |‘53pl‘4 y‘and over `contact Iß’lpld the wiper d2l is again energised after 7 steps by the Vswitch is connected. In the meantime relay P1 restores 10 over: wiperA d50 on contact 1„ contacts 25175, 'so thatthe next impul’se‘transmi‘ssiontakes place t’ßul, winding 1I of the relay PM, contacts l‘53pl`4, with vthe vwiper d5û'again being stepped-on from its*- rest position. According -to the setting of the wiper d2! on contact 3, three impulses are trans mitted since therelay `P1 isenergised after wiper ` (15B is set ‘on Contact 3 over: wiper d5!)> on con tact 3, wiper `dil on contact 3, contact 32rd, winding .II'of the ‘relay`Pl3, contacts ld1pli, lêBpIB, M'Bpl l, 1501012, |5102. The relay PI3 is energised in this >circuit in series with the relay P1 and >disconnects the wiper cl2-I and connects the wiper dSû. The wiper dell is, in the mean relay‘P‘lâ is also energised yand completes a hold ing'circuit for itself over Contact ldûpld. When the wiper d50 is operatedasecond time'therelay P1 is then energised in `series with the relay PI3 over: the wiper >dei) on contact 3, wiper dl5, contact L3mi, winding II `of vthe relay PI3, vcon tacts I‘Al’lpl-G, IltßplS, MSNM, |’5lìp|2,~l5lc2. Thus three impulses are transmitted, the two numbers already transmitted by the calling'subscri'ber be time, again restored to its rest position. By the third impulse train which is transmitted, as be fore the code repeater was seized are reproduced and are transmitted by the'code repeater over an S-line. When using other lines the vappro fore, over’the contact 192" the wiper d50 is stepped - priate impulse series' are suppressed. for Athe third time until'the contact 5 marked Corresponding >operations occur if “a Service' by the wiper d3û is reached. The relay P1 is call is to be made, for marking which, for ex now energised in series with the relay PII over: ample, the numbers 04 are dialled. In this case wiper 015D on Contact 5, wiper 1138 on contact 5, the relay P6 is operated over the wiper dll! the contact l45ul, winding II of the relay PII, con 30 --relays UI, U2 and Q2 arel energised. The Wipers tacts l44p|3, 90ml, 921212, 93c2. The wiper 013i) m20 to m26 and m30 to m36 are first set on the is disconnected and the wiper dell is connected. contact 01 and then contact 04. When the first The 4th impulse series is then undertaken by a number is transmitted the relay P1 is energised further operation of the wiper d50 according to over the Contact 354395 in series with the relay PM the setting of the wiper d40. When the corre- I while the next numberis transmitted in manner ` spending contact is reached the relay P1 is ener corresponding to that previously described. gised in series with the relay Sp. The contacts When using other lines a part of the impulse lßsp and lßlsp give rise to the disconnection of transmission is suppressed. the code repeater KZI. In the connecting device It should be noticed that for transmitting al1 Ue|2 relay P is de-energised, (Fig. 2) and the ~ the numbers of the marked number by means of a-conductor is switched through to the conductor the wiper d50 if two numbers are to be repro a2 over the contact Nlp; the calling subscriber duced afterwards, the ñrst number is transmitted receives a signal from the exchange and dials according to the direct marking over the contacts the additional numbers required for reaching the 25105 or 36126 the second number according to the required subscriber. settingr of the wiper dl5, the third according to The switch operations described above occur if, the setting of wiper`d2! and so on, while for re before the code repeater KZi is seized, a’single producing a number all numbers of the marking number (l) of the marking number (135) is sent number are transmitted by the aid of the wiper out. If, for example, for setting up a connection d5!) so that the wiper dl5 determines the first within the same toll area (BA1) two numbers number, d2! the second, dâíl the third and so on. have already been selected-cf. Fig. 1, in which We claim: . for reaching the main network 13 before a con l. In a telephone system, a multi-exchange necting device is seized the selectors GW and network, two groups of connecting devices in one GW1 are already set-the direction to be used of said exchanges, numerical switching apparatus is only developed by the use of a code repeater if in said one exchange operable to select either of the second number marks a different rural main said groups of devices at will and effective there exchange such as is the case, if in the present upon to seize one of` the devices in the selected instance the number 73 is selected. These num group, a code repeater common to all of said de bers selected before the code repeater is seized vices and having a plurality of contacts each cor have to be reproduced subsequently. For this 60 responding to a diiîerent one of said devices, purpose a wiper d|3 is provided together with means operated upon the seizure of said device by a relay P5. The contact bank traversed by the said apparatus to mark the one of said contacts wiper d|3 is so multipled with the contact bank corresponding to the seized device, means in said traversed by the wiper mil that the relay P5 is repeater controlled by the marked contact for energised after the wiper has taken the number determining the one of said devices seized and, of steps which correspond to the second number at the same time, registering a code depending (3) which is to be reproduced. The relay P5 upon the one of said groups selected, other means switches in the relays UI, U2 over its contact in said repeater operated variably to register a 21105 whereupon the relay Q2 is energised over code indicative of any other exchange in said net the contact 28u2, The wipers m20 to m26 and work, a direct and an indirect route over which mäû to m35, stepped-on after relay P5 is ener connections may be established between said one gised, stop when contact 1I is reached since then exchange and said other exchange, both of said the relays P8 and P9 are momentarily energised routes accessible to the seized connecting device,v over: wiper m25) or m30, contacts 1I, I 59135, said repeater controlled by said registered codes I5Bu2, |51u3, l56c2. The relay U3 is energised, to select one of said routes and to control the ex 6 2,276,489 tension of a connection thereover from the seized connecting device to said other exchange. 2. In a telephone system, a multi-exchange network having alternative routes for setting up connections between exchanges, a repeater in a local one of said exchanges for controlling the extension of connections to the distant exchanges in said network, two groups of connecting devices in said local exchange, means operated to seize 3. A- telephone system as claimed in claim 2, wherein said registration of the identity of the group to which said seized device belongs con trols the selection, by said repeater, of the route over which said connection to the desired ex change shall be extended. 4. In a telephone system, wherein connections are set up by automatic equipment under control of the digits of the called station’s number, two a device in one of said groups when it is desired 10 connecting devices, means for seizing one of said devices at times responsive to the receipt of a to extend a connection to certain of said distant certain order of digit of the called station’s num exchanges and to seize a device in the other of ber and for seizing the other of said devices at said groups when it is desired to extend a con times responsive to the receipt of a different order nection to other distant exchanges, means re of digit of the called station’s number, a con sponsive to the seizure of any of said devices for troller common to said devices, means for seizing identifying the seized device in said repeater and, said controller responsive to the seizure of either at the same time, registering therein the identity of said devices and for automatically register of the group to which the seized deviceY belongs, ing therein the digit which caused that device to other means in said repeater operated to register the identity of the exchange to which it is de- . be seized, said controller thereafter eiîective to control said automatic equipment in accordance sired to extend a connection, said repeater eiîec with said registered digit to extend a connection tive to select a route over which to extend the connection to said desired exchange and at times, from the seized device. in dependence upon the route selected, to repeat al1 or part of said registered information to con- . REINHOLD HOEFERT. trol switching apparatus to set up the connection KONSTANTIN SCHRODER. over the selected route.