US2244911A - Automatic telephone system - Google Patents

Automatic telephone system Download PDF

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Publication number
US2244911A
US2244911A US241506A US24150638A US2244911A US 2244911 A US2244911 A US 2244911A US 241506 A US241506 A US 241506A US 24150638 A US24150638 A US 24150638A US 2244911 A US2244911 A US 2244911A
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Prior art keywords
relay
exchange
contact
sub
earth
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Jauch Eugen
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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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Priority claimed from DE1937S0136552 external-priority patent/DE696679C/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite

Definitions

  • the present invention relates to automatic telephone systems with .main and sub-exchanges in which for the purpose of making a connection between two subscribers .of the same sub-exchange (an internal connection) the selectors are set with the aid of the main exchange.
  • the present invention describes a method of controlling both selectors from the main exchange over a single junction line.
  • the invention also relates to automatic telephone systems including-main and sub-exchanges in which the separation of traffic ,directions and :the sending of impulses for setting selectors in thesub eexchange isdoneinrthe main exchange.
  • thesendingout of impulses .from the main exchange to the subexchange controls, either the selector in thesubexchangewhichserves to select-the desired sub- ,exchange subscriber, .or in addition, the selector which carries out theconnection of the calling sub-exchange subscriber by .means of im ulses controlledjby the main exchan e.
  • the sending out of impulses to build up in omin connect sa internal connections; to the ,desired subscriber in -;the sub-exchange .is done either ,by switching me hanism, which, .oni s s ttin acco d n to certa n charac er zati n b n mpu e receive influenced by the calling -su bscriber of the main exchange or similarly by a switching discrimi- ,nator set tor the purpose of separating'thetrafiic directions from the Calling subscribers of the by the impulse selection of the calling subscriber connected to the sub-exchange, sends back the impulses.
  • the present invention describes another method which consists in connecting the operating magnets by switching devices influenced in the main exchange in dependence on the setting of a switching mechanism in an operating circuit controlled by the dial impulses for the separation of the traffic directions or in an automatic operating circuit-to produce impulses for setting the selector in the sub-exchange.
  • the switching mechanism for separating traflic directions and producing impulses for selecting the desired sub-exchange subscriber in the making of an internal connection the advantage is produced in that the expense on special switching mechanism is avoided if the switching technique does not allow the known repeated use of theiswitching mechanism serving to connect the calling subscriber.
  • this switching mechanism by means of its setting, characterizes the calling subscriber in the mainexchange for some purpose or other, e. g, metering his conversation.
  • three switching mechanisms are necessary, namely, for connecting the calling subscriber, for separating the trafiic directions, and for selecting the desired subscriber.
  • the last two functions can, for example, be carried out by 'a single" switching mechanism so that altogether only two switching mechanisms are necessary.
  • the invention also relates to automatic telephone systems having main and sub-exchanges in which connections between two subscribers of the same sub-exchange are made with the aid of the main exchange over a junction line extending between the main and sub-exchange.
  • the calling sub-exchange subscriber is only disconnected during the sending out of calling current to the sub-exchange from the junction line, and during this time the relay in the main exchange serving to maintain the connection is transitorily connected in the holding circuit so that during each pause in the calling current the calling subscriber is again connected to the junction line so as again to bring the relay serving to maintain the connection, under its influence.
  • the present invention indicates another method which according to Which switching arrangements come into effect after the characterizing of the desired sub-exchange subscriber,-
  • switch means in the main exchange serving to maintain the connection are operated, while switching means in the same circuit for disconnecting the calling current only come into effect on the reply of the desired subscriber.
  • the invention also relates to automatic telephone systems with main and sub-exchanges in which connections between subscribers of the same sub-exchange are metered by meters arranged inthe main exchange.
  • the present invention without undertaking any special construction of the subscribefls loop subscribers set.
  • Fig. 1 is a circuit diagram of the apparatus at the sub-exchange
  • Figs. 2 and 3 combined disclose a circuit diagram of the apparatus at the main exchange.
  • the sub-exchange UA is shown in the drawings which is connected over a junction line ac /b1; with a main exchange HA.
  • Two selectors AS and LW in the sub-exchange are associated with this junction line by which the selector AS (wipers-asl/asii) is set on a calling subscriber while the other selector LW (wipers lwl/lwd) serves to select the desired subscriber.
  • the control of the two selectors is done from the main exchange HA.
  • selector AS in the sub-exchange UA thus remains on the contacts of the calling subscriber.
  • the meter in the main exchange corresponding to the calling subscriber is'connected at the same time.
  • the calling subscriber can now, by sending out impulses, set up the desired connection and in fact can make connections over the main exchange HA as well as connections to subscribers in the subexchange.
  • a further switch mechanism MW (wipers 'mwl/mwfi) is provided which is stepped on by the individual impulse series sent out from the calling subscriber.
  • the relays TI to T3 in the sub-exchange UA are energized over the lead an of the junction line; and this circuit actually extends over: earth, battery, relay X, contact H8512, wiper kw3 of the switch mechanism KW in setting 0, contacts 251*2, '22s, 23M, Zim, lead at of the junction line, contacts H1762, liiui, wiper Zw'l of the selector LW in setting 0, wiper as! of the selector AS insetting 0, relays Tl .to T3, earth.
  • this circuit only the relays T! to T3 are energized so that, as shown, the contacts of these relays are closed in the normal condition of the system. .All the subscribers of the sub-exchange UA are accordingly multiplied to the conductor at of the junction line.
  • the relay X operates and connects itself in the holding circuit over its contact Il'lx, the resistance Wil i and the Wiper kw! of the switch mechanism KW in setting 0.
  • the normally existing circuit for the relays Tl to T3 mentioned previously is interrupted so that now over the contact 4H the rotary magnet Da's of the selector AS in the subexchange is connected to the lead b1) of the junction line.
  • the following circuit is made: earth, battery, winding I of the relay K, wiper 16102 of the switch mechanism KW in setting 0, contacts 12g, 383/, lead be of the junction line, contacts 5ul, 4H, contact 3dlw of the rotary magnet Dlw, wiper 21.04, of the selector LW in setting 0, contact l'rll, rotary magnet Dds of the selector AS, earth.
  • the relay K operates so that the following circuit is set up: earth, battery, rotary magnet Dkw, contacts I241), l'llk, H2q, l33a, earth.
  • the rotary magnet Dlcw is influenced so that the switch mechanism KW executes a single step.
  • the rotary magnet Dlcw on its energizing closes thecontact 3lldlcwso that over this contact and the resistance WM, the winding I of the relay Y is energized.
  • the following circuit is set up: earth, battery, resistance Wi l, contacts 34q, 39:], lead be of the junction line, contacts 5ul, 4t], contact 341110 of the rotary magnet Dlw, wiper 1204 of the selector LW in setting 0, contact -lrll, rotary magnet Das of the selector AS operates and steps on the selector AS by a single step.
  • the following circuit is made: earth, battery, resistance Wi l, contact ZSdicw of the rotary magnet Dkw, winding I of the relay A, windings II and I of the relay P, wiper lcw3 of the switch mechanism KW in settings I to II, contacts 251'2, 22s, 23142, 2Im and 20k, lead av of the junction line, contacts I3r2, IDuI, wiper mi of the selector LW in setting 0, wiper asI of the selector AS in setting 1, subscribers loop TwI, wiper cs2 of the selector AS in setting 1, contacts MI, 6142, BM, relay RI, earth.
  • the relay P at once operates, and after the short-circuiting of the high resistance Winding I over the contact 32p in the above mentioned circuit, the relay A is energized. On the opening of the contact I241: further operation of the rotary magnet Dlcw is prevented.
  • Relay K is maintained energized over: earth, battery, winding I of relay K, wiper IcwZ of switch mechanism KW in settings 1 to 11, contact 15y, wiper kwI of the switch mechanism KW in settings 1 to 10, earth.
  • the relay RI is transitorily energized in the above mentioned energizing circuit of the relay P in two stages: it operates the contacts marked rI2.
  • the short circuit for the windings I and II of the relay UI at the contacts I31'I2 and 6H2 is transitorily removed so that the relay UI is also energized in the circuit of the relay PI described,
  • the conductor ho is switched through to the calling subscriber, while by the opening of the contact 8ul the relay BI is disconnected.
  • the short-circuiting of the windings I and II of the relay UI does not take place, however, since the contacts IuI and IUuI- are open.
  • relay T is ener ized and stops the preselector VW. Over the wiper kw4 of the switch mechanism KW which together with, the selector AS in the sub-exchange UA rests on the contact I, the meter El 01 the calling subscriber in the main exchange HA is connected. Further, in the main exchange after the energizing of the relay A the following circuit is completed: earth, battery, winding III of the relay P, co tact 86p, winding I of the relay F; contacts 19a, 1811, 12k, earth. In this circuit the relay F is energized.
  • the circuit of the relay A energized over the subscribers loop is interrupted four times so that by the corresponding interruption of the bridge across the windings II and III of the relay Kat the contact 54a the first dial impulse receiver in the main exchange is influenced in known manner.
  • the rotary magnet Dmw of the switch mechanism MW is energized four times over: earth, battery, rotary magnet Dmw of the switch mechanism MW, contacts I268, I270, Iiik, II2q I33a, earth.
  • the switch mechanism MW reaches its fourth contact setting so that accordingly its wiper mw3 for example comes to rest on the contact nI,
  • the relay V is energized as a slow relay by the connection of its winding I over the contact I'iclmw of the rotary magnet Dmw, so that over contact 9812 and the contact I50 a holding circuit for the windings I and II of the relay C is closed during the impulse series.
  • the relay V restores with a delayed release so that now the following circuit is completed: earth, battery, winding I of the relay HI, resistance WzI i, contact B'IhIZ, wiper mw3, of the switch mechanism MW on the contact nI, contacts 961', 99m, 971), winding II of the relay C, contact H3211, earth.
  • the relay C is maintained energized.
  • the relay Hi on the first step operates its contact indicated by hi I.
  • a holding circuit is closed for the relay HI over: earth, battery, winding I of the relay HI, resistance Wild, winding II of the relay I-II, contacts I340, 94h, earth.
  • the second impulse series consisting of ten impulses brings about a setting of the second dial impulse receiver in the main exchange in corresponding manner bythe energizing and dealergizing of the relay A and a further setting of the switch mechanism MW, so that this moves from its zero setting of its wiper 111103 on to the contact 11.2.
  • the relay V is energized during the impulse series in the same way so that during this period the above mentioned holding circuit for relay C is closed.
  • the relay V When at the end of the impulse series the relay V is disconnected the following circuit is completed: earth, battery, winding I of the relay HI, contacts 8IhI I, 83h2I, Wiper mw3 of the switch mechanism MW on the contact 122, contacts 957', 99m, 9711, winding II of relay C, contact IIlZa, earth.
  • the relay C remains energized while relay HI energizes for the second time and operates its contact indicated by M2.
  • the energizing in the sec- 0nd stage is maintained in the circuit already described over contacts 9th and I340.
  • the next impulse series consisting of three impulses infiuences the third dial impulse receiver in the same manner in the main exchange as well as the switching mechanism MW till the latter reaches the contact 11.3.
  • the energizing of the relay C is maintained by means of the relay V energized during the impulse series in the manner already described.
  • the relay V is again disconnected so that the following circuit is completed: earth, battery, winding I of relay H2, resistance Wi-I-5, contacts 8471.22, '86hI2, wiper mw3 of the switch mechanism MW on the contact n3, contacts 967', 99m, 9112, winding II of the relay C, contact I92a, earth.
  • the relay C remains energized in this circuit when the relay H2 is energized in the first stage so that it operates its contact indicated by 71.2 I.
  • a holding circuit for the relay H2 extends over earth, battery, winding I of the relay H2, resistance W215, winding II of the relay H2, con tacts 93iz2I, 84114 I, earth.
  • the fourth impulse series sent out by the subscriber which consists of two impulses causes a fourth dial impulse receiver in the main exchange to be influenced and the switch mechanism MW to be displaced by two steps so that the wiper mw3 reaches the contact M.
  • the relay C also remains energized since the relay V is again energized during the impulse series so that after the completion of the impulse series in View of the denergizing of the relay V the following circuit is completed: earth, battery, winding I of the relay H2, contacts 82h2l, 85b3, wiper mw3 of the switch mechanism MW on the contact n4, contacts 867, 99m, 9112, winding II of relay C, contact IBZa, earth.
  • the relay C remains energized in this circuit while the relay H2 is now operated in the second stage. operates its contact indicated by 71.22.
  • a holding circuit for maintaining the relay H2 energized in the second stage, extends over: earth, battery, winding I of relay H2, resistance Wile,
  • the fifth impulse series consisting of two impulses influences the fiith dial impulse receiver and moreover steps on the switch mechanism MW by two steps to the contact n5.
  • the following circuit is made: earth, battery, relay H3, contact 9871.22, wiper mw-3 of the switch mechanism MW on the contact n5, contacts 969', 99m, 9112, winding II of the relay C, contact I02a, earth.
  • the relay C remains energized in this circuit; moreover, there follows an energizing of the relay H3 which is maintained in the following circuit: earth, battery, relay H3, contacts BiihZZ, I32h3, resistance W213, contact I3Ilf and Wiper 'mwfi of the switch mechanism MW in settings I-II, contact 1270, earth.
  • the sixth dial impulse receiver is set in the main exchange for the purpose of discriminating between the trafiic directions, and the switch mechanism MW is displaced by two steps so that its wiper mw3 reaches the contact 2'.
  • the following circuit is completed: earth, battery, winding I of relay J. contact 89713, wiper 111.103 of the switch mechanism MW on the contact 1', contacts 969', 99m, 911), winding II of relay C, contact 32a, earth.
  • relay J On the energizing of relay J the above described circuit extending over the wiper mw3 of the switch mechanism MW is interrupted and on the closing of the contact H257 a circuit is formed over the wiper mw i of the switch mechanism MW which extends over: earth, battery, winding I of relay J, wiper of the switch mechanism MW in setting contacts I657, fiSm, Bio, winding II of relay C, contact ma, earth. In this circuit relays J and C are maintained energized.
  • the relay V is energized for the purpose of maintaining the relay C energized, as has been described several times already, so that after the completion of the impulse series, in view of the deenergizing of the relay V the following circuit is completed: earth, battery, winding III of relay S, relay U2, wiper mw l of switch mechanism MW on the contact 9, contacts I057, 99m, 9711, winding II of relay C, contact Ill2a, earth.
  • the relay C' is maintained energized and therelay U2 is operated.
  • the energizing of relay S does not take place in this circuit.
  • the winding II of the relay C is short circuited so that it restores.
  • the relay J on the other hand remains energized in the following circuit: earth, battery, windings I and III of relay J, contacts IMJ', IElZa, earth.
  • the relay U2 is maintained energized over: earth, battery, winding III of relay S, relay U2, wiper miw l of the switch mechanism MW on the contact 9, contacts IiiBuZ, IBM, IBM, earth.
  • relay A is maintained energized While the relay RI is energized in the first stage and operates its contacts indicated by H I On the closing of the contact IilrII the rotary magnet Das of the selector AS in the sub-exchange UA is shortcircuited and by the'opening of the contact I H I the short circuit for the rotary magnet Dlw of the selector LW is removed so that now in the sub-exchange UA the rotary magnet Dlw is ready for operating and the conductor bv in the junction line is connected to the main exchange.
  • the relay HI is disconnected, and by the opening of contact 94hII brings about the deenergizing of relay I-I2.
  • the relay H3 is disconnected.
  • the relay HI is again energized over: earth, battery, winding I of relay HI, resistance Wild, winding II of relay I-II, contacts 9Ic, 92h2I, wiper mwZ of switch inechanism MW in setting 111, contact IfiIld-mw of the rotary magnet Dmw, earth.
  • the relay S is energized so that by the opening of contact I268, the rotary magnet Dmw of the switch mechanism MW is disconnected and further stepping of the switch mechanism MW and thus also the selector LW in the sub-exchange UA is suppressed.
  • the short circuit for the resistance W12 is. removed at thewiper IwI so that the relay RI .can be maintained energized over the subscribers loop of the calling subscriber TnI and this resistance Wi2 only in the first stage, even when the resistance Wi3 is shortcircuited.
  • connection set up depends upon the calling subscriber in the following circuit: earth, battery, resistance Wit, contact 29dlcw, winding I of the relay A, contacts 3
  • this circuit therelays A and J are maintained energized by the calling subscriber and hence, the connection is maintained.
  • the relay R2 by closing its contact 2412, connects calling current to the lead av of the junction line which reaches the desired subscriber over the following circuit: earth, battery, ringing current, resistance Wz'8, contact 247"2, Winding II of relay J, resistance Wi3, contact 2070 or 2Im, lead at of the junction line, contacts I 3H2, Iilul, wiper lwI of the selector LW in setting 1, subscriber TnIO, wiper 12122 of the selector LW in setting 1, con tacts 'IuI, 5H2, 8uI, relayRI, earth.
  • the further extension of the call results by the energizing of the relay R2 over: earth, battery, windings I and II of relay R2, contacts I I 83, N90, I 2Iu2, slow interrupter LU, earth.
  • the energizing current extending over the junction line and contact 2512 passes over the contact 24r2 and resistance Wit, so that during the sending out of the calling current the maintaining of the connection by energizing the winding II of the relay J is made possible over the loop of the calling subscriber.
  • the calling subscriber therefore has the possibility during the sending out of calling current, of controlling the supervising the circuit for maintaining the connection without disturbing the sending out of calling current to the desired subscriber by means of his speaking loop. If he wishes to hang up the receiver, then in view of the interruption the loop connection is released.
  • the relay RI operates in the second stage so that at the contacts 6112 and I3rI2 the short circuit for the windings I and II of the relay UI is removed.
  • the relay UI operates the circuit mentioned and connects the conductor Zw by closing the.con tact SuI.
  • the relay RI is disconnected by the opening of contact 8uI; the resistance W12 is short-circuited over the contact II uI.
  • the holding circuit for the relay UI now extends over: earth, battery, resistance W14, contact 29dlcw of the rotary magnet Dlcw, winding I of relay A, contacts SI), 3210, wiper 701.03 of the switch mechanism KW in settings 111, contact 25r2, winding II of the relay J, contacts 23u2, 26k or 2Im, lead a2; of the junction line, winding I of the relay UI, contact IIuI, contact I 202220 of the rotary magnet DZw, wiper asl of the selector AS in setting 1, calling subscriber Tnl, wiper cs2 of the selector AS in setting 1, or wiper ZwI of the selector LW in setting 1, desired subscriber Tnlll, wiper 1102 of the selector LW in setting 1, Winding II of relay UI, contact 9uI, lead be of the junction line, contacts 38y, 4Iu2, 43p, 45s, winding I of the relay M, earth.
  • the relay M operates.
  • the relay M is maintained after the deenergizing of relay S over: earth, battery, winding II of relay M, contact I3Im, resistance W213, wiper mwfi of the switch mechanism MW in settings 111, contact 7270, earthr
  • the winding III of the relay A is connected to the conductor 171) after the deenermaintains the connection which is short circuited over contact 44s.
  • the relay J is, however, maintained energized over the windings I and II in the following circuit: earth, battery, windings I and III of the relay J, contact iiil y', I'fiZa, earth.
  • the control circuit for maintaining theconnection which serves at the same time to feed both subscribers TTLI and TnIB is as follows: earth, battery, resistance Wit, contact 29dkw of the rotary magnet Dlc'w, winding I of the relay A, contacts My, 32p, wiper 701.03, of the switch mechanism KW in settings 1-11, contacts 2512, 22s, 23202, 2%, lead at of the junction line, winding I of the relay UI, contact IIuI, contact IZdZw of the rotary magnet DZw, wiper asl of the selector AS in setting I or wiper 1112!
  • the switch mechanism MW is connected in its normal position and the following circuit is completed: earth, battery, rotary magnet Dmw, contacts I258, I290, I28hl I, I09u2, M33713, earth.
  • the energizing and deenergizing of the rotary magnet Dmw in this circuit is produced by the contact IZBhII which on the energizing of the rotary magnet Dmw opens the contact Ithidmw and thus disconnects the relay I-II whereby by the opening of the contact I 26ml the rotary magnet Dmw is deenergized so that over contact I fiiidmw relay HI is again connected. This alternate operation and release continues until the wiper mwZ of the switch mechanism MW has left the contact segment I--II so that further operation of relay III is prevented.
  • impulses are sent out to: the sub-exchange.
  • the rotary magnet Dlw of the selector LW is influenced" so that the selector LW is stepped on in the sub-exchange.
  • the wiper 1104 of the selector LW stands in its zero position so that rotary magnet Dlw is shortcircuited and further influencing by impulses from the main exchange is prevented.
  • the relay X is disconnected when the wiper lcwl reaches the segments I-Iil.
  • the switch mechanism KW in the main exchange I-IA steps on past zero position by action of the relay K and sends further impulses to the sub-exchange UA, by which now over the conductor b1) of the junction line the rotary magnet Das of the selector ASis operated.
  • Relay K can now no longer be energized over conductor bu sov that the switch mechanism KW should it be in its normal position, is not stepped on any further.
  • relay K is' energized and deenergized' over the wiper 70102 in setting 1-11 in combination with relay Y and the rotary: magnet Dkw tilIthe switch mechanism KW has reached its normal position.
  • the wiper mw 5 reaches the setting 0 so that after the deenergizing of the relay V at the termination of the impulse series, the following circuit is made: earth, battery, winding III of relay S, contact I942), wiper 76105 of the switch mechanism KW in setting 1, wiper mw5 of the switch mechanism MW in setting 0, contacts I057, 99m, 9112, winding II of relay C, contact I02a, earth.
  • the relay S operates while the relay C in contrastv to the switching operations when the correctnumber is selected, remains energized. As a result the rement together. with.
  • two exchanges means for completing a local connection between two subscribers lines in one of said exchanges, a source of potential in the other of said exchanges, and means including but one two-conductor inter-exchange trunk line for connecting said source to said local connection to supply transmission current to both of said subscriberslines.
  • a telephone system two exchanges, a trunk line connecting said exchanges, subscribers lines terminating at one of said exchanges, a switch in said one exchange having access to said subscribers lines, and means in the other of said exchanges responsive to a calling condition on one of said subscribers lines for controlling said switch over said trunk line to connect with said one subscribers line.
  • a main exchange means in the main exchange controlled by the initiation of a call from a subscribers station in the sub-exchange for operating one of said switches over said trunk line to seize the calling line, means in the main exchange operated over the trunk line by the calling subscriber for desig over the trunk line to the sub-exchange, a receiving circuit in the sub-exchange responsive to said impulses and operating one of said switches to connect with the calling line, means in the main exchange operated over the trunk line by the calling subscriber for designating the wanted line, means in the sub-exchange operated over said trunk line by said last means if the designated line is in said sub-exchange to alter said receiving circuit to control the other of said switches, and means in the main exchange for then transmitting one or more impulses over the trunk line to cause said other switch to connect with the designated line.
  • a main exchange In a telephone system, a main exchange, a sub-exchange, a trunk line connecting said exchanges, means for extending a connection from a calling subscribers line in the sub-exchange over said trunk line to the main exchange, said connection containing a certain resistance,
  • a main exchange In a telephone system, a main exchange, a sub-exchange, a trunk line connecting said exchanges, two switches in the sub-exchange,
  • a main exchange for at times determining the routing of calls from calling subscribers stations in the sub-exchange and for at other times controlling switching equipment in the sub-exchange to extend calls to called subscribers stations in said sub-exchange, said means including a step-by-step switch, a circuit for operating said switch in accordance with impulses received over said trunk line from a calling station in the sub-exchange to determine the routing of the call therefrom, another circuit for operating said switch to transmit impulses over said trunk line to control the switching equipment in said sub-exchange to extend a call to a desired one of the stations therein, and means controlled in accordance with the position of said step-by-step switch for rendering but one of said circuits effective.
  • a main exchange for at times determining the routing of calls from calling subscribers stations in the sub-exchange and for at other times controlling switching equipment in the sub-exchange to extend calls to called subscribers stations in said sub-exchange, said means including a step-by-step switch, a circuit 'for operating said switch in accordance with impulses received over said trunk line from a calling station in the sub-exchange to determine the routing of the call therefrom, another circuit for operating said switch to transmit impulses over said trunk line to control the switching equipment in said sub-exchange to extend a call to a desired one of the stations therein, means controlled over one wiper of said switch at times rendering said first circuit effective, and means controlled over a different wiper of said switch at times rendering said other circuit effective.
  • a main exchange In a telephone system, a main exchange, a sub-exchange, a trunk line connecting said exchanges, subscribers lines terminating at the sub-exchange, means for transmitting impulses from a calling one of said subscribers lines over said trunk line to designate the routing of the call from said calling line, a step-by-step switch in the main exchange, a first circuit for at times operating said switch in dependence upon the impulses received over said trunk line to determine the routing of said call, a second circuit for at times operating said switch to transmit impulses over said trunk to control switching equipment in the sub-exchange to extend the call to one of the subscribers lines in the same subexchange, and means controlled in accordance with the position of said step-by-step switch for determining which of said circuits shall be effective.
  • a main exchange In a telephone system, a main exchange, a sub-exchange, a trunk line connecting said exchanges, a plurality of subscribers lines terminating in the sub-exchange, a plurality of devices in the main exchange respectively corresponding to said subscribers lines, means for operating said devices, means in the main exchange controlled by the initiation of a call by one of said subscribers lines for connecting the corresponding device for operation by said means, means in the main exchange operated over the trunk line by the calling subscriber for designating the wanted line, and means operated whenever the designated line is the same as the calling line for preventing the operation of the device connected.
  • a main exchange In a telephone system, a main exchange, a sub-exchange, a trunk line connecting said exchanges, a plurality of subscribers lines terminating in the sub-exchange, a plurality of devices in the main exchange respectively corresponding to said lines, a switch in the sub-exchange and a corresponding switch in the main exchange, means responsive to the initiation of a call by any of said subscribers lines for transmitting impulses over the trunk line to operate said first switch to seize the calling line, said means also effective to operate said last switch to characterize the calling line, another switch in the main exchange operated over the trunk line by the calling subscriber to characterize the wanted line, means normally effective to subsequently operate the device corresponding to the calling line, and means for rendering said last means ineffective if both of the switches in said main exchange characterize the same line.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
US241506A 1937-11-22 1938-11-21 Automatic telephone system Expired - Lifetime US2244911A (en)

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Application Number Priority Date Filing Date Title
DE1937S0136552 DE696679C (de) 1937-11-22 1937-11-22 Schaltungsanordnung fuer Fernsprechanlagen mit Haupt- und Unteraemtern und Waehlerbetrieb

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US2244911A true US2244911A (en) 1941-06-10

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US241506A Expired - Lifetime US2244911A (en) 1937-11-22 1938-11-21 Automatic telephone system

Country Status (2)

Country Link
US (1) US2244911A (de)
CH (1) CH206560A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004107A (en) * 1955-03-31 1961-10-10 Siemens Ag Telephone party line switching
US3198887A (en) * 1961-11-20 1965-08-03 Bell Telephone Labor Inc Distributed telephone line concentrator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE911112C (de) * 1942-05-12 1954-05-10 Max Rob Fastenrath Abfuellvorrichtung fuer Saecke, Beutel od. dgl.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3004107A (en) * 1955-03-31 1961-10-10 Siemens Ag Telephone party line switching
US3198887A (en) * 1961-11-20 1965-08-03 Bell Telephone Labor Inc Distributed telephone line concentrator

Also Published As

Publication number Publication date
CH206560A (de) 1939-08-15

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