US1750848A - Automatic telephone system - Google Patents

Automatic telephone system Download PDF

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Publication number
US1750848A
US1750848A US150911A US15091126A US1750848A US 1750848 A US1750848 A US 1750848A US 150911 A US150911 A US 150911A US 15091126 A US15091126 A US 15091126A US 1750848 A US1750848 A US 1750848A
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Prior art keywords
relay
contact
switch
over
group
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US150911A
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English (en)
Inventor
Lubberger Fritz
Langer Max
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Siemens and Halske AG
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Siemens and Halske AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/4228—Systems providing special services or facilities to subscribers in networks

Definitions

  • Patented Mar. 18 1930 UNITED STATES PATENT OFFICE 1 FRITZ LUBBEBGER, OF BERLIN-SCHMEARGENDORF, AND MAX LANG-ER,
  • junction lines could be rendered'available in the group of which the connections can be deviated, and the incoming end of these junction lines could be directly connected to junction lines going to the wanted exchange, which is not accessible to the calling exchange over a direct route.
  • Such an arrangement renders it necessary to divide the group of junction lines, but it is known that this would have a bad effect on the traflic carrying capacity of the junction lines and thus on the etficiency of the installation.
  • connections are deviated over the junction lines used for calls between the calling exchange and theexchange used as an intermediate exchange for the deviated connect-ions, because these junction lines terminate at switches of a group selecting stage located in the building up of the connection beyond the group selecting stage, which determines the trafiic direction and therefore selects the exchange.
  • junction lines which are used for the traffic between two exchanges are also used for the deviated connections.
  • group selecting stage that determines'the traflic direction
  • the object of the present invention is to enable connections to be deviated without reducing the efiiciency of the group of junction lines to the exchange used as an interme-- diate exchange for he deviated connections and without repeating the group selecting junction lines going to the exchange, over.
  • the arrangement can be so devised that the junction lines, which are used for deviated connections, are provided with two differently numbered means of access, and the selection of one of these means of access determines whether it is to be used for a deviated call or a direct call.
  • the incoming ends of these junction lines can be provided with two switches connected in parallel, namely a switch for making a numerical and then a non-numerical selection and another switch making only a non-numerical selection.
  • Each of these switches so corresponds to a particular means of access to the junction line that when one means of access, is taken into use only the switchmaking a numerical and then a nonnumerical selection is started up for setting up a connection in this exchange and when the other means of access is taken into use only the non-numerical switch is started up for setting up a deviated connection;
  • the incoming end of the junction lines to be used for deviated connections can be provided with only one switch, which, ad-
  • cording to the particular means of access 7 used is positioned either by a numerical se-.
  • the Figure 1 shows the arrangement according to the invention applied to a telephone area having three exchanges VSt I,
  • the Figure 5 shows the application of the invention to two'wire junction lines.
  • the . Figure shows an arrangement, in which the incoming ends of the unction lines to be used for the devia d connection have access to several groups 0 call seekers and'a call seeker belongingto a particular group is started upaccording to the connectionto be set up.
  • the Figure 8 shows an example, in" which the incoming end of the junction line is proby a numerical selection followed by a nonnumerical one or is positioned only by a nonnumerial selection.
  • group selector I.'GW1 is positioned onto the contact group DKQ and an idle junction line VLl to the exchange VSt II is seized, at which the numerical switches -II.GW2 and LW2 are positioned.
  • FIG. 2 shows an arrangement, in which the deviation of the connections is efi'ected automatically.
  • the contact group DK2 is provided for calls to the exchange VSt II, while over the contact
  • all junction group DK3 are set up connections to the ex- 2 change VStIII;
  • the junction lines VL1 going to the exchange VSt II are connected to are positioned over the junction linethe first five contacts of the contact group DK2.
  • the switch I.GW1 automatically reaches the succeeding contacts, to which are likewise connected thejunction lines that are connected to the first contacts of the contact roup DK3.
  • the switch I.GW1 automatically reaches the succeeding contacts, to which are likewise connected thejunction lines that are connected to the first contacts of the contact roup DK3.
  • FIG. 3v is shown by way of example an arrangement in which the trunk lines VLQ, which are to be used for deviated connections, are provided with a separate auxiliary lead for each means of access.
  • the wipers 3', 4 and 5 of the switch I.GW1 are positioned on the contacts 6, 7 and 8 of the contact group DK3;
  • the relays P1 and C1 are operated.
  • the relay P1 rat the contacts 12121 and 13291 switches through the speaking leads, while the relay C1 at contact 1501 disconnects the relay C2 and fixtureryirom the lead VL20Z and thus marks engaged the junction line VL2 in the second contact'group DK2.
  • This junction line cannot be seized over the contacts 9, 10 and 11 of the contact group DK2, because when a test wiper reaches the test contact 11 no test circuit is closed.
  • the relay C1 in the exchange VSt III initiates in any desired manner the positioning of the switch ILGWV3, which is to be next positioned by number impulses from the calling party.
  • the relay P1 When the junction line is seized by the first group selector I.GW1 for a deviated connec tion over the contacts 9, 10 and 11 in the contact row DK2, the relay P1 is energized in series with the relay C2 at the incoming'end of the junction line. The relay P1 again connects through the speaking leads, while the relay C2 marks engaged the junction line in the third contact group DKB, because by opening the contact 1402 it disconnects the relay 'Cl from the lead VL20.
  • relay C2 also opens 'its'contacts 1602 and 1702, thereby disconnecting the speaking leads VL2a and VL2b from the leads going to the wipers 18 and 19 of the second group selector II.GW3 and connecting its speaking leads over the contacts 2002 and 2102to the leads 22 and 23, which only go to the nonvnumerical switch MW.
  • the relay C2 closes the following circuit of the motor magnet D1 of the switch MW: earth, contacts2402, 25292, self interrupting contact 260Z1, motor magnet Dl, battery, earth.
  • the switch MW is moved on step by step over its bank contacts and is arrested when it reaches an idle junction line VL3 going to the exchange VSt II (see Fig. 1), because the following test circuit is then established: earth, contact 2702, windings I and II of relay P2, wiper 28, contact 29,relay C3, battery, earth.
  • the relay P2 at its contact 25122 opens the circuit of the motor magnet D1, it marks engaged the selected junction line VL3 by short circuiting its high resistance Winding I at contact 30702, and at the contacts 31p2and 32102 it switches through the leads 22 and 23 and with them the speaking leads VL2a and VL2b of the 'unction line VL2 to the wipers 33 and 34 of the switch MIV, hence the speaking leads are now connected over the contacts 35 and 36 to the speaking leads 37 and '38 of the junction line; i V
  • junction line VL2 having been seized During this connection it is impossible for the junction line to be seized over the second means of access (contact 44DK2) because when a hunting switch reaches the contact 44, its test relay does not receiveenough current to operate it.
  • the test circuit still contains the high resistance winding of relay C4.
  • the current flowing over the lead VL20 is so weal; that in addition to the test relay P3 only the relay C5 can be operated and not the relay C6.
  • the relay C5 now connects up the switch MIV and disconnects the switch ILCFWZ; in the same manner as the relay C2 in the arrangementshown in Fig, 3.
  • the relay C4 opens its contact 4204 and so marks engaged in the contact group D113 also the seized junction line. i
  • the Figure 5 shows an example for twowire unction lines VL2.
  • the relay C9 opens its contact 7209 and prevents the re lease magnet M1 being energized after the contact 7810 is closed when the first lifting stepis taken. Furthermore by opening the/contact 7409 the relay C9 disconnects the relay C10 from the lead' 67. The closing of the contacts 7509 and 7609 prepares-the circuit of the rotary magnet D2 and the test circuit.
  • the following locking circuit-for the relay C9 is closed after the first lifting step: earth, battery, resistance 71, relay C9, off-normal contact 8070,-earth.
  • the relay C9 is short circuited over the contacts 69011 and 8161 each time the relay Al is energized, butjit cannot fall back,
  • the disconnection of earth now causes the re lease of the relays P3 and C7.
  • the following circuit is closed for initiatin switch ILGW3: earth, attery, relay F, contacts 9208, 9307 ,lead 67, contact 94010, relay B1, contact 6670, earth.
  • the relays F and B1 areoperated.
  • the relay B1 By closing its contact 9461, the relay B1 connects the relay A1 to the lead 60, while the relay F, by closing its contact 95f, likewise connects earth to the the release of thelead 60; hence the following circuit is established for energizing the relay A1; earth, contact 95;, lead 60, contacts6l010, 9461', re istance 95, rela relays Al and 1 close their contacts 6901 and 8161.
  • the relay C9 now can fall back.
  • junction line VL2 is seized over the contact group DK2.
  • the following test circuit is established after the wipers 50, 51 and 52 have been, positioned on the contacts 100, 101 and -91: earth, relay P3, wiper 52, contacts 91,
  • relay C8 closes its contact 10208, which is in parallel with the contact 9007, furthermore at its contact 10308 it connects up the relay C7.
  • the following circuit for energizing the relay ClO at the incoming end of the junction line has been closed: earth, contacts 10408,
  • the relay C At the incoming end of the junction line VL2v the relay C is energized and opens at the incoming end of the junction line,
  • the relay C10 at contact 112010 now closes the circuit of the motor magnet D3 of the switch MW: earth, battery, contacts 112010, 113125, self interrupting contact 114053, magnet D3, battery, earth. Furthermore the relay C10 at its contact 115010 has connected the test relay P5 to the. test wiper 1 16. When the wipers of the switchMW reach the.
  • the opening of the contact 10308 also releases the relay C7,which upon its release initiates the release of the switch e.- cause the following circuit functions over the lead 67 earth, battery, relay F, contacts 9208 9307, lead 67 contact 109010, lead 111, relay-B2," earth.
  • the relay B2 closes ltscontacts 12252 and 12362.
  • the relay F closes its contact 95f-and so establishes the following.
  • junction line VL2 When the junction line VL2 is taken into use over the contact group DK3, a switching operation is performed over the junction line the call seeker AS III.- When such a call seeker has been positioned on the junction line VL2, the latter-is connected with a group selector II.GW3.
  • the switching operation performed when the junction line is taken into use causes the starting up of a call seeker AS II associated withan idle junction line VL3 and the switch now seeks the junction line VL2, taken into use.
  • the switching operation which efiects the starting up of a call seeker in one of the two groups, also causes the junction line to be made ready for testing only in the contact field of the call seekers 'of the particular group, that is. to say for example in the call seeke'r group AS III or in the call seeker group AS II.
  • Figure 7 is shown an arrangement, in which the wipers of the call seekers AS II are not directly connected to the junction line -VL3, but the connection between the exchanges VSt III and-VSt II is effected by a double non-numerical selection, because a call seeker AS II hunts for the seized junc-.
  • FIG. 8 shows an arrangement, in which a switch is associated with the incoming end 'of each junction line VL2, this switch being positioned either by a numerical selection followed by a non-numerical selection or is positioned only by a non-numerical selection.
  • a Strowger switch can be used, which is provided with a special eleventh level. In their normal position, the
  • eleventh level which is located below the-first :level used for the numerical selection.- Henc.
  • the wipers are at once rotated over this special level. I If, on the contrary, the lifting magnet be first connectediup, the switch will be operated in the known manner and the wipers will be raised. by the lifting magnet to alevel only accessible by a numerical selection, whereupon the wipers are positioned on a contact of the selected level by connecting up the rotary magnet.
  • junction line L3 going to the ex change VStII areconneted to the special eleventh level, in front of which the switch wipers normally stand.
  • VL2 is a two wire junction line. Hence its outgoing end is similar to that shown in the Figure 5..
  • a multiofiice telephone system three ofiices, trunks from the first oflice to the second oflice, trunks from the first ofiice to the third oflice, trunks from the second oflice to the third oflice, switching mechanism in the first ofiice operative for extending a connection over one of said trunks to-the third otfice, said switch mechanism further operative re-' sponsive to a busy condition of the trunks from the first to the third oflice to extend said connection to the second ofiice byway of one of said trunksinstead of to said third oflice, a non-numerical hunting switch in said second oflice, and means responsive to said last mentioned extension for automatically operating said switch to hunt for a trunk extending from the second oflice to the third office.
  • a trunk terminating in one end in a numerical switch and a non-numerical hunting switch and at the other vend in two branches, a switching mechanism having access to said branches, means whereby said mechanism is operated to seizesaid trunk from one of said branches to extend a connection, means responsive to a busy condition whereby saidv mechanism is operated to seize said trunk from the other of said branches to extend a connection, and means dependent upon the branch seized for determining whether said numerical switch or said non-numerical hunting switch is to be used for further extending said connections.
  • aI'trunk terminating in one end in a numerical switch and a nonsnumerical hunting switch and at the other end in two branches, a switching mechanism having access to said branches, said trunk comprising a pair of talking conductors common to said branches, a test contact for each of said branches at .said other end, means for operating said mechanism to seize said trunk over one of said branches to extend a connection, means responsive to a busy condition whereby said mechanism is operated to seize saidtrunk from the other of said branches to extend a connection, and means operated over the said test contact as sociated with the branch seized for determining whether said numerical switch or said non-numerlcalswltch 1s to be used for fur-' ther extending the connections.
  • a trunk terminating in one end in a numerical switch and a non-numerical switch and in the other end in two branches, a switching mechanism having access to said branches, said trunk comprising only a pair of talking conductors common to, both said branches, means for operating said mechanism to seize said trunk over one of said branches to extend a connection,
  • a trunk termibranches operative responsive to said seizure for disconnecting said numerical switch from said trunk and for connecting said non-numerical switch to said trunk.
  • a two conductor trunk terminating in an automatic switch, a first and a second relayin said switch, means for operating said switch to extend a connection, means whereby said first relay is energized over a circuit including one talking conductor of said trunk, means operative responsive to said energization for energizing said second relay over a circuit including the other talking conductor of said trunk, and means responsive to the energization of said second relay for releasing said-switch.
  • a two conductor trunk terminating in an automatic switch, a release and a test relay in said switch, means for operating said switch over-said trunk to extend a connection, said relays being energized by the operation of said switch, means controlled over the two conductors of said trunk for short cir'cuiting said release relay thereby causing said relay to deenergize, contacts on said release relay closed responsive to said deenergization for short circuiting said test relay thereby causing said relay to deenergize, and means controlled by said release and test relays for causing said switch to release.
  • a two conductor trunk terminating in a switch, means for op erating said switch over said trunk to extend a connection, a pair of line relays in said switch, means controlled over said trunk for operating first one and then the other of said line relays, a release and-a test relay in said switch, means controlled by the operation of said line relays for causing the operation of said release relay; means controlled by the operation of said release relay for causing the operation of said test'relay, a release magnet in said switch, and means controlled by the operation of said release and test relays for operating sai'd release magnet to release said switch.
  • an automatic switch has access to alternative trunk routes for extending a connection to a third exchange and wherein the first route includes trunks comprising only two talking conductors directly connecting the first and third exchanges while the alternative route includes trunks comprising only two talking conductors connecting the first and second exchanges and the second and third exchanges, means for operating said switch to directly select either of said routes by seizing a trunk to the third exchange or by seizing a trunk to the second exchange without. seizing a trunk to the third exchange, and means in the second exchange automatically operated over said conductors in case the alternative route is taken into use for connecting the trunk in use extending from the first exchange to the second exchange with a trunk extending fromthe second exchange to the third exchange in order to complete the connection.
  • an automatic switch in the first ofiice has access to a group of trunk lines extending to a third ofliceand to a group of trunk lines extending to a second ofiice and wherein a group of trunk lines extend from the second oflice to the third oflice
  • automatic switching means comprising a non-numerical hunting switch 'in said second exchange responsive to said seizure for automatically extending the connection to the third exchange over a trunk line extending from the second to the third exchange.
  • a switching mechanism in-Qthe first office has access to a group of trunks comprising only two talking conductors extending to a third oflice for extending connections thereto and to a group of trunks comprising only two talking conductors extending to a second .ofiice when all the trunks extending to the third oflice are busy and wherein a group of trunks extend from the second to the third oflices

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Structure Of Telephone Exchanges (AREA)
US150911A 1926-01-05 1926-11-26 Automatic telephone system Expired - Lifetime US1750848A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938960A (en) * 1957-07-24 1960-05-31 Gen Dynamics Corp Alternate routing in a step-by-step telephone system
US3202766A (en) * 1960-12-23 1965-08-24 Int Standard Electric Corp Alternate routing in telephone systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938960A (en) * 1957-07-24 1960-05-31 Gen Dynamics Corp Alternate routing in a step-by-step telephone system
US3202766A (en) * 1960-12-23 1965-08-24 Int Standard Electric Corp Alternate routing in telephone systems

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