US1763901A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US1763901A
US1763901A US148120A US14812026A US1763901A US 1763901 A US1763901 A US 1763901A US 148120 A US148120 A US 148120A US 14812026 A US14812026 A US 14812026A US 1763901 A US1763901 A US 1763901A
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Prior art keywords
relay
circuit
earth
conductor
switch
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Expired - Lifetime
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US148120A
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English (en)
Inventor
Ostline John Ellis
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Associated Telephone and Telegraph Co
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Associated Telephone and Telegraph Co
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Publication of US1763901A publication Critical patent/US1763901A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • This invention relates to telephone systems and particularly concerns improvements in register controllers for use in such systems.
  • a trunk relay group from which access is had to the register controller is combined with a first numerical switch as in British Patent 233,007, complete accepted May 1, 1925, and is hereinafter referred to as a first code selector.
  • the first code selector is arranged so that it may be used interchangeably either as an automatic subscribers first code selector or as an operators first code selector there being separate groups of similar switches provided for completing calls from the'two sources.
  • battery for talking purposes is supplied from'the operators position and in the latter case from the first code
  • the first code selector is taken into use from a manual position the battery feeding apparatus in the first code selector is disconnected upon response of the called party and the connection is held under the control of the operator over a single conductor which is separate from the speaking circuit.
  • this first code selector is arranged to have access to twenty trunks from each of its ten levels.
  • this improved first code selector controls the connecting up of busy tone currents, number unobtainable tone currents, the metering of completed connections and in the event of a busy line or group of lines being encountered during the setting up of a wanted connection the release of the partly established connection and the transmission of the necessary signalling currents to the calling party (subscriber or operator).
  • this first code selector is arranged to bring about the release o'f the registering apparatus and the connecting up-of signailing currents to the calling line when the number transmitted by the calling party is not correctly recorded on the register switches.
  • the selector is manufactured without regard as to which of the two services it is to perform, and that the conductors are brought out to. the terminals 1-8, located to the left, so that the switch may function in one manner or the other, depending upon how these terminals are connected through the. usual jack contacts, with which these terminals engage in practice.
  • Fig. 1 shows the combined operators" or subscribers first code selector switch FCS.
  • Fig. 2 shows a jack ending trunk circuit at an operators position.
  • Fig. 3 shows the A digit register ADS of a register controller and a register control-lei: selector switch RCS.
  • Relay L upon energizing, performs the fol lowing functions: at L energizes relay BS over the circuit earth, low resistance winding of relay M, L K BB B BS, battery; and at L completes the following circuit for the high impedance relay I and impulse relay A; battery, upper winding of A, N H K strapped terminals 7 and 5,311 winding of relay LK, right hand winding of polarized relay D, strapped terminals 6 and 8, L normally closed contacts eon-v trolled by K, H N lower winding of relay A, 11th stepped cam springs CS to earth. Relays I .and A accordingly operate their armatures 1 and A A respectively.
  • Relay BS upon energizing completes at BS an energizing circuit for the upper winding of relay B and at BS and at BS completes a locking circuit for I itself as follows: earth, BS I, BS BS,
  • Relay B 'up on-energizin g, earthsthe re'lease'trunk PR at'B over the normally closed contacts controlled by BB and at B completes the following locking circuit for itself: battery, upper winding of B, B
  • Relay A upon energizing, completes at 'A the following circuit for relay C: battery, winding of C, 0H normal springs .ON, A Dl,-conductor 104, B earth and at A prepares a holding circuit-for the lower winding: of B.v Relay B atB now starts the .register-controller-selector; ROS,
  • Fig 3 hunting for; an idle A digit switch ADSasffollows: earth, B1104, home positionscontact and test wiper, PVV conductor 103, K C B M to'one side of switching elay K and conductor 102, interrupter contactDM and driving magnet DM to battery.
  • Relay K will'be short circuited as long as earth p0 tential is encountered by test wiper PW but when an idle A digit switch is found relay K will energize series with driving magnet DM.
  • Relay C upon operating, also prepared at C the operating circuit for Vertical magnet V and at C disconnected itself from, theupperwinding of relay A and at contacts C and C? prepared circuits for the shunt field relay E.
  • switching relay K Fig. 1 Upon the register-controller-selector ROS Fig. 3 finding an idle A digit switch ADS, switching relay K Fig. 1 operates and performs the following functions: at K it completes a holding circuit for release'relay B independently of line relay L, at K it completes the following circuitfor relay AA in the A digit switch ADS Fig. 3, earth, low resistance winding of forced release relay M, L K 105, impulse wiper- IW, HH winding of AA to battery.
  • RelayAA energizes in' this circuitbut relay M does not .owing to the comparatively high resistance of the former; Relay AA, upon energizing I completes at AA an energizing circuit-for release relay BB and relay BB earths the re leas etrunk PR at BB and at BB prepares a circuit for connecting the dialing tone to V the calling line. Relay K the relay A and battery.
  • the calling party ing tone may now dial the digits of the Wanted number.
  • Relay L responds to these 1 digits and repeats the first digitto relay AA of the A digit switch ADS and the second and third digitsto the ofiice register magnets of the register-controller taken into use by the A digit switches a result of the dialing of the first digit. Subsequent digitsin the wanted number are repeated by relay L to thevariousnumerical registers associated with the register controller.
  • Relay 1 is'held havingreceived the dialdurin 'the settin of the A di 'it switch b a. b
  • Relay A of the first code selector'FC/S responds to the'first A series of impulses sent out by the register controller and repeats them at A to the vertical magnet ;V. As soon as the vertical magnet V operates it releases the double dog springs DD and a circuit is completed for both windings of shunt field relay E.
  • the shunt field relay E is identical with the shunt field relay shown in British Patent No. 170385 and is so constructed that it will only oper ate when both of its windings are energized at the same time.
  • the energizing circuit for relay E is as follows: battery, interrupter springs R of rotary magnet R, double; dog springs DD to the common point of both windings of relay from the other side or the rightharid winding via springs G and B to earth, while the other side of the left hand winding of relay E is connected to earth via springs C and B Relay E, upon operating, completes a lockin circuit for itself at ax-matures E and as follows: battery, interrupter springs R springs DD, both windings of relayE in parallel, armatures E and E, oil normal springs 9N B earth.
  • the first series of impulses is repeated to the yertical magnet V, as fob lows: earth, B D A C V, battery.
  • the oil normal springs ON, 01 1 and 0N operate and relay C is then maintained energized'in parallel with the vertical magnet V during the traismission of remaining impulses in the series.
  • both sets of wipers VV, +VV, 1 3V and +d PiV are raised opposite to l els of bank contacts corresponding to the digit dialed.
  • the rotary magnet R earth, normally closed contacts cont-rolled by C E' winding of rotary magnet R to battery.
  • Rotary magnet It now rotates the shaft carrying the two sets 01" wipers W, N, l? a", and Phi on to the first two trunl: lines in the res ective levels of the Wiper sets and at the same time opening the interrupter springs Rthereby opening the holding circuit oi relay E which deenergizes.
  • the further rotation of the wipers depends on whether or not both trunk lines are busy and supposing this is the case the private wipers PW, Eli of both sets will find earth potential and a circuit will be completed for both windings of relay E which will operate and close the rotary magnet circuit over the same circuit as previously described.
  • both relays H and N will energize in series with the windings of relay E but since relays H and N are so arranged that each opens the circuit of the other only one of them' will remain energized and the speaking conductors will be extended only over one set of wipers.
  • Relay E at contacts E also disconnects relay I tlron'i the negative speaking conductor in order to prevent the calling party from hearin the impulses sent out by the register controller.
  • relay K also releases the A digit switch and register controller in known manner, so that they may be available f r setting up other connections.
  • the holding circuit for relay B is transferred from K to L and the high impedance relay 1 is connected across the talking conductors in series with the right hand winding of polarized relay I).
  • relay D When the called party answers, relay D operates and at D connects earth to conductor m which serves to operate the calling partys meter.
  • the switches in the same exchange as the first code selector FCS are maintained energized by guarding potential connected up at B being fed forward over either wiper PW or 13V.
  • the release of the connection is brought about by the calling party replacing his receiver causing relay'L to de-energize and open the circuit of release relay B.
  • Relay B upon tie-energizing, completes the following circuit torrelease magnet Z: earth, B off normal contacts 0N, release magnet Z to battery.
  • the release of relay B also removes holding potential at B and other operated relays in the first code selector (ls-energize.
  • relay 1 will de-energize and re-energize. Since the battery period will cause relay I to open the circuit of relay BS for a period long enough to :allow it to release the following circuit will be completed for relay BR upon the re-energization of relay 1: battery, upper winding of BR, normally closed springs controlled by BB BS I, BS 104:, B earth.
  • Relay BR upon energizing, will release the partly established connection in the same manner as .ifthe callingparty had replaced his receiver in the ordinary way,the only difference being that relay L is still energized and now 7 controls relay BR which guards the calling line at BB It will be seen that relay BB upon energizing opens at BB the energizing circuit for release relay B and that relay BR connects at BB the combined busy tone and busy flash signalling conductor BTF, to the calling line through the lower winding of relay L. Responsive to this operation the calling party (subscriber or operator) will receive the usual busy signal i. e. tone to a calling automatic subscriber and a flashing signal to an operator.
  • the calling party subscriber or operator
  • relay BB is held energized over its upper winding and the holding conductor it. It should be noted also that the release of the partly established connection holding period of the switch where the busy condition originates and therefore no earth holding is required. In the case of a busy tone arising-at the A digit switch, relay I will be interrupted as before and bring about is arranged to take place durin the nonthe above condition as well as the release of the A digit switch.
  • relay M in the first code selector will be operated over its low resistance winding as follows: battery connected up as a result of the operation of the time pulse relay to conductor 105, K L, low resistance, winding of relay M to earth.
  • Relay M operates under these conditions and completes the following circuit for relay BR: battery, upper winding of BR, normally closed contacts controlled by BB v1 C B earth. Relay BR upon operating will release any partly operated equipment by bringing about the release of release relay B.
  • the A digit switch will be released by" the operation of the time pulse relay TP causing battery to be connected to conductor 105 as follows: battery, T T1,
  • Relay L the switch FCS energizes over conductors l and2 inthe following circuit: battery, upper w nding of relay L, conductor- 1, LE tipof jack, operators. 1 loop, ring of gack, LE conductor 2, ⁇ lower winding of L, BB earth.
  • Belay L operates as before and completes acircuit at'L for relay BS and the latter relay completes at BS a circuit for relay B.
  • Relay B (upon operating, earths the release trunk PR at armature B This earth extends over conductor 3 and causes the supervisory lamp associated with the jackof this trunk to glow. The operator now dials the digits in the wanted number which are recorded in the register controller. taken into use by. the
  • the register controller sends out the necessary digits to establish connection with the wanted party and when the wanted party answers'the polarized relay D in the first code selector 7 will operate and connect earth'to the meter-.
  • Relay LR in the manual speaking conductors of the first code switch 7 FCS and extends the tip and ring conductors of the jack over the conductors 7 and 8 to the speaking conductors of the first code switch.
  • Relay L remains energized in series with relay LB in order to complete the talking circuit at L and to control the release of the'connection at L
  • the removal of the polarized relay D from the speaking conduct-crs will cause it to dcenergize and remove earth from conductor 4-.
  • the operator remores the plug from the acl; the sleeve relay S will deenergize and at S open a holding circuit for relays LR and L.
  • circuit connections in such relay group arranged to secure the proper functioning when the call extended thereto is from an automatic subscribers line, and circuit changing means operated automatically upon the response of the called subscriber for suitably altering the circuit connections in case the call is I coming from a manual switchboard.
  • a metering conductor at said relay group together with means for operating a meter thereover when the called subscriber responds in case the call is from an automatic subscriber line, and circuit-changing apparatus operated over said metering conductor instead oi said meter in case the trunk relay group is unctioning in connection with a manual switchboard instead of in connection with automatic lines.
  • an impulse responding relay in? said relay group arranged to be controlled over a loop circuit during the setting up of a connection, and means effective upon the response of the called subscriber for disconnecting the impulse responding relay from the talking circuit and for holding up the connection by holding it-operated in an independent circuit.
  • a relay in saidltrunk relay group ar ranged to be controlled over a partlyestab lished connection, and means responsive to a prolongeddeenergization and a reenergizaion of said relay'for releasing such partly established connection and for giving the calling party a busysignal.
  • an automatic switch arranged to extend an incoming trunk line of either of two diflerenttypes, the types of said trunk line being such that they must be differently connected to said switch and terminal facilities so arranged that the switch may be used interchangeably to extend connections from an incoming trunk line of either type.
  • a trunk line of one type having a given number of conducsystem claimed inclaim tors
  • a trunk line of another type having a larger. number of conductors
  • an automatic switch arrangedwith the proper nmnber of incoming conductors to extend a connection from the last named trunk, but capable of use with said first named trunk, and termi nal facilities so arranged that when the switch is used in connection with the trunk line having the smaller number of conductors the excess conductors incoming to the switch are looped together.
  • an automatic switch having talking conductors therein,
  • each vof. said talking conductors being opened with the Open ends brought out to terminals, and terminal facilities such that the open ends of the talking conductors a may be closed locally in case'the switch is used as the terminus of an incoming'trunk of one type andmay be connected to incoming trunk conductors in case' theswitch is used as the terminus of an incoming trunk of another type.
  • trunk line having 'aplurality of conductors, a trunk line having a different number of conductors, an automatic switch arranged to serve as the terminus for. either trunk line interchangeably, and -means including terminal 7 Wiring for completing local circuits overrun- October 1926.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
US148120A 1926-01-16 1926-11-13 Telephone system Expired - Lifetime US1763901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1315/26A GB270782A (en) 1926-01-16 1926-01-16 Improvements in or relating to telephone systems

Publications (1)

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US1763901A true US1763901A (en) 1930-06-17

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US148120A Expired - Lifetime US1763901A (en) 1926-01-16 1926-11-13 Telephone system

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US (1) US1763901A (pt)
BE (1) BE270782A (pt)
FR (1) FR636798A (pt)
GB (1) GB270782A (pt)

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Publication number Publication date
GB270782A (en) 1927-05-16
BE270782A (pt)
FR636798A (fr) 1928-04-16

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