US2276489A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2276489A
US2276489A US340294A US34029440A US2276489A US 2276489 A US2276489 A US 2276489A US 340294 A US340294 A US 340294A US 34029440 A US34029440 A US 34029440A US 2276489 A US2276489 A US 2276489A
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United States
Prior art keywords
contact
wiper
relay
over
energised
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Expired - Lifetime
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US340294A
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English (en)
Inventor
Hoefert Reinhold
Schroder Konstantin
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Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH
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Fides Gesellschaft fuer die Verwaltung und Verwertung von Gewerblichen Schutzrechten mbH
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Publication of US2276489A publication Critical patent/US2276489A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Definitions

  • the present invention relates to improvements in telephone systems and more particularly to a circuit arrangement for multi-exchange telephone systems the exchanges of which are interconnected in dilerent ways.
  • a call can be set up over the various junction lines provided or over dilerent exchange stations.
  • the latter is, for example, the case if as Well as junction lines between the toll exchanges or between the rural main exchanges and the associated toll exchanges so-called tie lines are provided between rural main exchanges and other exchanges of the same or of another toll area over which traffic may be developed.
  • the required exchange station can then be reached from the rural main exchange for example over the junction lines leading to the toll exchange erover tie lines.
  • this line leads directly to the required exchange station or at rst to another exchange station over Which the required connection can then be set up, a certain number of the stored numerical impulse series are sent out from the code repeater.
  • I1 it is desired to prevent the code repeater being taken into use when connections are set up within the rural main exchange connecting means must be provided the seizing of which is only undertaken after the selection of one or more numerical impulse series by the calling subscriber so that the code repeater must determine the numerical impulse series sent out before its seizure in order to determine the path to be used and, if necessary, to be able to transmit the impulses peater is not at the sole disposal of any one connecting device in the exchange in question but .is provided in common for several connecting devices, it must determine by which of these connecting devices it has been seized in order that the selected free line should be connected With that connecting device seized by the corresponding calling subscriber.
  • the determination of the toll area selected by the calling subscriber and the connecting means seized for this purpose is simplified and false operation is prevented. rThis is attained therein that switch devices are associated with the code repeaters, to the contacts of Which are connected the connecting devices used by the code repeater in groups according to their traino directions and also singly so that by the setting of the switch device simultaneously the signal selection and setting up of the connecting path to be reproduced by the code repeater according to the direction of the seized connecting device is determined-and the connecting device connected With the selected connecting path is also determined.
  • FIG. l is a schematic networky layout of a multi-exchange area With a number of connecting paths, While in Figs. 2 and 3 a section of the rural main exchange (NHA'IZ) is shown attainable by a calling subscriber over a connecting means Uel2 to-which a code repeater (e. g. KZ! common to several connecting devices may be connected over a connectionselector (for example AW2).
  • the selectors Ws, Wa, Wb, Wc
  • a code repeater e. g.
  • KZI KZI
  • the selectors necessary for its diierent functions and the signal control relay Battery and earth are omitted where they are not necessary in order that the invention ybe explained to simplyfy the drawings.
  • the setting magnets for the selector with the associated revertive relay are not shown in order to explain more simply the operation in question.
  • the contact banks of each signal selector are shown schematically in order to keep the circumference of the selector within a reasonable space; and a limited number of wipers are shown in the given embodiment.
  • the selectors in Figs. 4 and 5 with the reference d step-by-step selectors are used and for those with the reference m motor selectors are used; naturally other types of selectors may be used.
  • rural main exchanges for example NHA12,13, 'M or NIIA
  • To some of the rural main exchanges are 'connected junction centres, for example KA ⁇
  • 2 shown in Figs. 2 and 3 with the associated selectors Ws, Wa, Wb, Wc, is like the code repeater KZI shown in Figs. 4 and 5, provided in the following example in the rural main exchange NHA'IZ. From this exchange are connected so-called S-lines to the associated toll area exchange BA1, which is connected over junction lines with the toll area exchange BAL Also between the rural main exchange NHAIZ and the toll area exchange BA
  • the S-lines are lines which end at an S-group selector for .selecting a toll exchange.
  • the A-lnes end in an A-group selector which provides for the selection of a rural main exchange.
  • the B-lines lead to a Bgroup selector which provides for the selection of a junction centre while the C-lines lead to a C-group selector and are provided for the selection of a final exchange.
  • a calling subscriber belonging to the rural main exchange NHA'IZ may reach, for example, the junction centre KA
  • the marking number for access to this junction centre is 135 and the rst gure l serves for setting a group selector GW in the rural main exchange NHA'lZ on the rst decade, in which a free connecting means is hunted e. g. the connecting means Ue
  • a free code repeater e. g.
  • KZI is connected over a hunting switch AWZ.
  • 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 number 1) by setting the wipers dIIJ--dlS according to setting of the wipers mIU-ml'
  • the wiper d dl By a corresponding setting of the m20-m26, m3
  • the junction line available in the required direction is determined, the chosen line is connected with the connecting means Ue
  • the group selector GW in the rural main exchange NHA'I2 (Figs. 2 and 3) is set by the numeral 1 on the decade l, it hunts for a free connecting means. If, for example, a connecting means Ue
  • 2 is prepared to be connected With a free code repeater e. g. KZI and the relay T of the hunting switch AW2 is energised over: earth, battery, WzS (Fig.
  • wiper ml on contact 2 wiper ml on contact 2
  • relay Pl contacts 2
  • the relay PI is thus energised when the selector is stepped-on to the second contact; in a manner not shown here, further stepping by the selector is prevented.
  • the relay QI is energised over the contact 2311i and holds itself energised in a holding circuit over its contact Zlql.
  • the selectors with the wipers mG-m and mtgm56 are set in motion until the wipers mail and m50 reach the contacts marked by the wiper ml I.
  • the relays P2 and P3 are energised over: relay P2, wiper m40 on contact I or relay P3, wiper m50 on contact I, wiper 'm'I I on contact 2, contact 2502.
  • the impulsing relay AI of the code repeater KZI receives the e further impulse series transmitted from the calling subscriber over the conductor 3.
  • the selector with the wipers 2li-0123 is set and, since the next impulse series consists of three impulses, reaches the contact 3.
  • switching over takes place so that the third impulse series (5) is transmitted from the relay AI to the selector with the wipers (E38 and dl. If necessary a 4th impulse series is subsequently transmitted to the selector of the wiper ddl).
  • the relay Q2 energised over the contact 25nd after relay P4 is energised during the determination of the iirst numeral (l) connects the selectors in a manner which is not shown, with the wipers 1MB-m26 and Z39- m33 in an automatic stepping circuit. They are stepped-on until the wipers m2o and m38 reach that contact which is marked by the wiper dI I set on the contact I. The test relays P8 and P9 of these two selectors are now -energised and stop the selector.
  • relay U3 is energised over: contacts 31o/5, 38179, 39138, llllq2. Relay U3 breaks the circuit for the relays P8 and P9 at 3Su3 so that the two selectors are again switched in.
  • this impulse series consists of three impulses the wiper d2! is set on the contact 3, the two selectors with the wipers mim-m26 and m30-m36 are in motion until the wipers m20 and m3@ reach the contact I 3.
  • the relays P8 and P9 are energised over: wiper m29 or m39 on contact I3, multipling, wiper d ⁇ 2ll on Contact 3, contacts d2u2, 43415, and No2.
  • the relay QQ is energised over the contacts M115, 435119,46@ and 47:12 and is held energised over its contact Tlqd. II"he relay Q5 is rcstored by the short-circuit over the contact fi-8c4. A further setting operation of the two selectors is prevented.
  • the multipling for the other directions is carried outy according to all the connections which are possible.
  • three rural main exchanges NHAIZ, NHAES and NEL/lill may, for example, be connected to ⁇ the toll area exchange BAI.
  • 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 mlll to m65 wired to the rst contact of the contact bank traversed by the wiper mill.
  • other A-lines are provided, in the contact bank traverse I2 to Ill should be connected and multipled with the rst contact of the contact bank'traversed by the wiper mil-2. This applies similarly for the B and C lines.
  • the relay Qd is energised in the present circuit after the wipers m20 to m26 and mSI to m36 are set.
  • the wipers d to -d2 are stepped-on in any known manner.
  • the relays PII As soon as contact 2 of the wiper dll is reached the relays PII) and PI I are energised in series over 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, contact SM2, relay PII.
  • the relay PII Over the contacts IrI,
  • the relay PI2 is connected to the wiper dSI. Since the wiper dl. is set at Contact 2 and the wiper m55 on the contact I (conductor oc) it can energise as long as a free C-line is available over the conductor vc. In this case the relay PI2 is energised over: contacts S'Irl, 53pm, relay PIZ, wiper cZGI on contact 2, wiper m55 on contact I, conductor vc, contacts 54120, 55mc,
  • relay Bc is also energised and by closing its contact 565e the rotary magnet Dc of the selector Wc is connected over the contact '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, contact BpIZ.
  • the connecting device UeI2 seized by the group selector GW to which the free C-line is connected is connected 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 wiper c of the selector Wc over contact Slmc so that the relay is energised over: C-line, windings II and I of the relay Nc, contact BImc, wiper c of the selector Wc, relay R, contact 181', wiper e2 of the connecting selector AW2, conductor 5 (Fig. 4) winding I of the relay RI, contacts 'I9pI2, 800
  • the holding circuit for the relays Nc and R is now extended over the contacts 13T, 'IIa and 5c, while relay RI (Fig. 4) is connected in a holding circuit over its winding II and the contact 82H.
  • relay RI Fig. 4
  • 2 now connected to the selector Wc is locked, while by the closing of the contacts 62nc and 631m the speaking conductors are switched through.
  • the relay Vc is energised so that the relay Mc is also held energised over its winding III and the contact 680e.
  • relay PI2 cannot be energised over a corresponding inc-conductor; the wipers dII) to e162 are stepped-on until Contact 4 is reached.
  • relay PII When relay PII) is energised the testing of the availability of a free B-line, corresponding with the testing (C-line) described above, takes place over the conductor vb. If a free vb conductor is available, the corresponding relay is operated as for the seizing of the free C-line, the selector Wb is set on the connecting device UeI2 and the connecting path is switched through.
  • the wipers d to 162 are stepped-on until contact 5 is reached.
  • relay PID is energised the relay PI2 tests over the conductor va. whether a free A-line is available and if this is the case causes the selector Wa to be set on the connecting device Uel2 in a manner corresponding to that described above for the C or B-lines.
  • the wipers dIl-CZBZ are stepped-on until they reach the contact 6 over which the availability of an S-line is tested. If a free S-line is available the selector Ws is correspondingly set on the connecting device UeIZ over the conductor Us and is set according to the conductor ds marked.
  • the relay PII is energised after a C-line is determined; it holds itself energised further over the contact 89p
  • a contact is immediately marked in the contact bank traversed by the wiper d50 which corresponds to the setting of the wiper dIIIJ sothat the wiper d50 can take up this setting.
  • the relay P'I is energised over: wiper d50, multipling, wiper 1140, contact Iul, relay Sp, contacts 9IpII, 92pI2, 9302. Further switch operations are described further on.
  • relay PI3 is energised after this B-line is selected and a holding circuit is completed over the contact I43pl3.
  • contact 5 in the contact bank traversed by the wiper d50 corresponding to the setting of the wiper d3() (3rd dialling of the marking number) is marked so that the wiper d50 takes up this setting and thus, as will be explained later, can transmit 5 impulses. In this case the numbers 1 and 3 are absorbed.
  • the relay PI4 is energised and a holding circuit is completed over the contact I46pl4.
  • is connected so that its sett-ing (on Contact 3) is taken up by the wiper S56. In this case only the number 1 of the marking number is absorbed.
  • the wiper dI5 set on the contact I is immediately connected since the contacts I5Ic2 and I50pI2 are, as in the above cases, closed.
  • the wiper d50 thereupon takes up the setting of this wiper dI5 and no numbers are absorbed.
  • the actual stepping-on of the wiper d50 when taking up its position for the purpose of impulse transmission takes place by the well-known a1- ternating reciprocal interaction of the relays I and K when the contact M is closed.
  • the contact I9i transmits the impulses over the conductor 4 and the wiper d2 of the selector AW2 over the connecting device UeI2 while another i-contact operates the magnet, not shown, of the wiper d5 If it is assumed that an S-line is connected with the connecting device Uel2 over the selector Ws the whole marking number 135 is transmitted as described above.
  • the number 1 is marked by the setting of the wiper dI5 on the contact I, the number 3 by the setting of the wiper dZI on the contact 3 and the number 5 by the setting of the wiper on the contact 5. Since now 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 is disconnected ⁇ at contact l51p1.
  • relay P1 restores 'so thatthe next impulsetransmissiontakes place with vthe vwiper d'again being stepped-on from its* rest position.
  • the wiper d2! on contact 3 three impulses are transmitted since therelay ⁇ P1 isenergised after wiper (B is set on Contact 3 over: wiper d5! on confore, overthe contact 192" the wiper d50 is stepped for Athe third time until'the contact 5 marked by the wiper d3 is reached.
  • the relay P1 is now energised in series with the relay PII over: wiper 015D on Contact 5, wiper 1138 on contact 5, contact l45ul, winding II of the relay PII, contacts l44p
  • the wiper 013i) is disconnected and the wiper dell is connected.
  • the 4th impulse series is then undertaken by a further operation of the wiper d50 according to the setting of the wiper d40.
  • spending contact is reached the relay P1 is energised in series with the relay Sp.
  • the contacts lsp and llsp give rise to the disconnection of the code repeater KZI.
  • relay P is de-energised, (Fig. 2) and the a-conductor is switched through to the conductor a2 over the contact Nlp; the calling subscriber receives a signal from the exchange and dials the additional numbers required for reaching the required subscriber.
  • the switch operations described above occur if, before the code repeater KZi is seized, asingle number (l) of the marking number (135) is sent out. If, for example, for setting up a connection within the same toll area (BA1) two numbers have already been selected-cf. Fig. 1, in which for reaching the main network 13 before a connecting device is seized the selectors GW and GW1 are already set-the direction to be used is only developed by the use of a code repeater if the second number marks a different rural main exchange such as is the case, if in the present instance the number 73 is selected. These numbers selected before the code repeater is seized have to be reproduced subsequently. For this purpose a wiper d
  • 3 is so multipled with the contact bank traversed by the wiper mil that the relay P5 is energised after the wiper has taken the number of steps which correspond to the second number (3) which is to be reproduced.
  • the relay P5 switches in the relays UI, U2 over its contact 21105 whereupon the relay Q2 is energised over the contact 28u2,
  • the relay U3 is energised,
  • relayPl is also energised yand completes a holding'circuit for itself over Contact ldpld.
  • 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, vcontacts IAllpl-G, IltplS, MSNM,
  • Corresponding operations occur if a Service' call is to be made, for marking which, for example, the numbers 04 are dialled.
  • the relay P6 is operated over the wiper dll! the -relays UI, U2 and Q2 arel energised.
  • the Wipers m20 to m26 and m30 to m36 are first set on the while the next numberis transmitted in manner corresponding to that previously described. When using other lines a part of the impulse transmission is suppressed.
  • the rst number is transmitted according to the direct marking over the contacts 25105 or 36126 the second number according to the settingr of the wiper dl5, the third according to the setting of wiper ⁇ d2! and so on, while for reproducing a number all numbers of the marking number are transmitted by the aid of the wiper d5! so that the wiper dl5 determines the first number, d2! the second, dl the third and so on.
  • a multi-exchange network two groups of connecting devices in one of said exchanges, numerical switching apparatus in said one exchange operable to select either of said groups of devices at will and effective thereupon to seize one of ⁇ the devices in the selected group, a code repeater common to all of said devices and having a plurality of contacts each corresponding to a diierent one of said devices, means operated upon the seizure of said device by said apparatus to mark the one of said contacts corresponding to the seized device, means in said repeater controlled by the marked contact for determining the one of said devices seized and, at the same time, registering a code depending upon the one of said groups selected, other means in said repeater operated variably to register a code indicative of any other exchange in said network, a direct and an indirect route over which connections may be established between said one exchange and said other exchange, both of said routes accessible to the seized connecting device,v
  • 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 a device in one of said groups when it is desired to extend a connection to certain of said distant exchanges and to seize a device in the other of said groups when it is desired to extend a connection to other distant exchanges, means responsive to the seizure of any of said devices for identifying the seized device in said repeater and, at the same time, registering therein the identity of the group to which the seized deviceY belongs, other means in said repeater operated to register the identity of the exchange to which it is desired to extend a connection, said repeater eiective to select a route over which to extend the connection to said desired exchange and at times, in dependence upon the route selected, to repeat al1 or part of said registered information to control switching apparatus to set up the connection over the selected route.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Small-Scale Networks (AREA)
  • Interface Circuits In Exchanges (AREA)
US340294A 1939-05-17 1940-06-13 Telephone system Expired - Lifetime US2276489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES137099D DE734032C (de) 1939-05-17 1939-05-17 Schaltungsanordnung fuer Fernsprechanlagen mit mehreren Vermittlungsstellen, welche ueber verschiedene Verbindungswege erreichbar sind

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678968A (en) * 1942-06-27 1954-05-18 Bell Telephone Labor Inc Digit reconstruction system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE948703C (de) * 1944-08-04 1956-09-06 Telefonbau & Normalzeit Gmbh Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb und mehreren in Reihe geschalteten Vermittlungsstellen zur Steuerung des Verkehrs ueber Durchgangsaemter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678968A (en) * 1942-06-27 1954-05-18 Bell Telephone Labor Inc Digit reconstruction system

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