US2484612A - Directory number calling line identifier - Google Patents

Directory number calling line identifier Download PDF

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Publication number
US2484612A
US2484612A US670358A US67035846A US2484612A US 2484612 A US2484612 A US 2484612A US 670358 A US670358 A US 670358A US 67035846 A US67035846 A US 67035846A US 2484612 A US2484612 A US 2484612A
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Prior art keywords
tube
bus
tubes
lines
line
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US670358A
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Joseph W Dehn
William H T Holden
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AT&T Corp
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Bell Telephone Laboratories Inc
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Priority to BE473095D priority Critical patent/BE473095A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US670358A priority patent/US2484612A/en
Priority to FR944777D priority patent/FR944777A/fr
Priority to CH277163D priority patent/CH277163A/de
Priority to GB12635/47A priority patent/GB650774A/en
Priority to US51591A priority patent/US2590514A/en
Application granted granted Critical
Publication of US2484612A publication Critical patent/US2484612A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/08—Metering calls to called party, i.e. B-party charged for the communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/13—Gas discharge tube

Definitions

  • This invention pertains to telephone systems and more particularly to systems for identifying calling lines to determine their directory numbers.
  • Calling-line-identiiying devices are necessary in connection with the automatic recording of telephone calls and it is desirable, for this purpose, that calling lines be identified by their directory numbers rather than by terminal numbers, to avoid the further operations necessary to obtain the directory numbers for billing purposes.
  • Identification of lines by their directory numbers presents diiiiculties, particularly in systems of the cross bar type where there is no direct relation between the terminal number or physical location "of a line and its directory number.
  • the present invention discloses an economical and simple system for obtaining the directory numbers of calling lines directly and rapidly; While particularly valuable in connection with cross bar systems, it is not limited in its application to systems of that type nor to the purposes of automatic message recording, but is applicable to any type of telephone system and to any purpose for which it is desirable to ascertain the directory numbers of calling lines.
  • a feature of this invention is the use of electronic devices, which are inexpensive, not subject to rapid deterioration, and readily replaceable.
  • Another feature of the invention is the use of a unidirectional pulse of extremely short duration to effect identification, with the consequent saving in time and equipment.
  • the pulse may be extremely short because the indicating devices responsive to said pulse are affected by the rate of change of the pulse as it increases from zero to its maximum value rather than by the specic magnitude of the pulse.
  • Another feature of the invention is an arrangement Iwhereby a plurality of identiiiers may each be connected for identification of calling lines at any time without interfering with one another.
  • Another feature of the invention is a novel form of pulse generator for actuating identiiiers of the type disclosed.
  • Still another feature of the invention is the use of equipment' to serve a large number of subscribers lines, not only in one central office but, if desired, in a plurality of central oflices.
  • Fig. 1 shows two subscribers lines, the extension of one of said lines by switching means, and a portion of the common circuit networks provided for identifying these and other lines;
  • Fig. 2 shows another portion of the common circuit networks
  • Fig. 3 shows the circuit of an identiiier
  • Fig. 4 shows circuits for actuating a plurality of identifiers
  • Fig. 5 is a graphical representation of the potentials supplied to a pulse generating tube shown in Fig. 4.
  • Fig. 6 shows how the above iigures (except Fig. 5) should be placed with relation to one another to disclose the invention.
  • the sleeve conductor of each subscribers line the directory number of which may be required to be identified is connected to one element of each of two gas-discharge cold cathode tubes.
  • the sleeve conductor I3 of line II is connected to one element of each of tubes I5 and I6, while the sleeve conductor I4 of line I2 is connected to one element of each of tubes I1 and I8.
  • the other element of each of the tubes assoi ciated with each line is connected to one of common conductors or bus-bars,.in accordance with the thousands and hundreds digit combination of the directory number of said line.
  • bus-bars THUU, THM, TH52 and THSS are four of the 100 bus-bars provided for oflice No. 1 in which lines I I and I2 are located, and are the bus-bars assigned to the thousands and hundreds digit combinations 00, 41, 52, and 99, respectively. Accordingly, an element of tube I5, associated with line II the directory number of which is 5238, is connected to bus-bar TH52, to which are also connected corresponding elements of tubes associated with other lines (not shown) in the same central oiiice having directory numbers the thousands digit of which is 5 and the hundreds digit of which is 2.
  • an element of tube Il associated with line I2 the directory number of which is 4167, is connected to bus-bar PTHII, to which are also connected elements of tubes associated with other lines (not shown) in the vsame central oiiice having directory numbers the thousands digit of which is 4 and the hundreds digit of which is 1.
  • busbars-THU To each of the thousands-hundreds-digits busbars-THU! to TH99 is connected one element of each of three gas-discharge cold cathode diode tubes.
  • one clement of each of tubes i9, 20, and 2l is connected to bus-bar 'FI-199
  • one clement o each of tubes 22, 23, and 24 is connected to bus-bar TH52
  • one element of each of tubes 25, 26, and 21 is connected to bus-bar THM
  • one element of each of tubes 2B, 29 and 30 is connected to bus-bar THUD.
  • the other element of onc l the tubes connected to each thousandshundreds-digits bus-bar is connected to a bus-bar individual to the central cnice served by said thousands-hundreds-digits bus-bar.
  • bus-bar OFFI which is individual to oce No. l.
  • the other element of the second of the tubes associated with each thousands-hundreds-digits bus-bar is connected to one of thousands-digit bus-bars THU to THS in accordance with the thousands digit of the thousands-hundreds-digit combination, while the other element of the third tube associated with each thousands-hundredsdigits bus-bar is connected to one of l0 hundreds digit bus-bars H0 to H9 in accordance with the hundreds digit of the thousands-hundreds-digit combination.
  • one element of tube 23, associated with bus-bar TH52 assigned to the digit combination 52, is connected to bus-bar THS, to which are also connected corresponding elements of tubes associated with other thousands-hundreds-digits bus-bars (not shown) assigned to digit combinations the rst digit of which is 5.
  • sociated with bus-bar TH52, is connected to busbar H2, to which are also connected corresponding elements of tubes associated with other thousands-hundreds-digits bus-bars (not shown) assigned to digit combinations the second digit ..1
  • the thousands-hundreds-digits bus-bars are each supplied with negative potential, for example, from battery BI through resistances 3l, 32, 33, and 31S, and each of the ofiice, thousandsdigit and hundreds-digit bus-bars are supplied with a higher negative potential, for example, from battery B2 through resistance 35 to busbar OFFI.
  • the difference of potential of batteries Bl and B2 is approximately that necessary to maintain conduction in each tube, such as tube I9, but is insuncient to initiate conduction in said tube. None of the gas-discharge diode tubes connected to the bus-bars, therefore, normally conduct but will conduct if the difference of potential between their elements is slightly increased.
  • bus-bars and gasdischarge tubes A similar arrangement of bus-bars and gasdischarge tubes is used tto indicate the tens and the units digits of directory numbers.
  • the other element of the above-mentioned second gas-discharge diode tube associated with the sleeve conductor of each subscriber's line is connected to one of 100 tens-units-digits bus-bars, of which bus-bars TUBO, TU38, TUM and TU99 are four, in accordance with the tens-units-digits combination of the directory number of said line.
  • an element of tube I6 associated with line Il the directory number of which is 5238 is connected over conductor 36 to bus-bar TU38, to which are also connected corresponding elements of tubes (not shown) associated with other lines the directory numbers of which coinprise the tens-units digit combination 38, while an element of tube I8, associated with line l2 the directory number of which is 4167, is connected over conductor 31 to bus--bar TU61, to which are also connected corresponding elements of tubes (not shown) associated with other lines the directory numbers of which comprise the tens-units digit combination 67.
  • bus-bars TUBO TUBE To each of the tens-units-digits bus-bars TUBO TUBE is connected one element of each of two gas-discharge cold cathode diode tubes.
  • bus-bar TUSS To each of the tens-units-digits bus-bars TUBO TUBE is connected one element of each of two gas-discharge cold cathode diode tubes.
  • one element of each of tubes 38 and 39 is connected to bus-bar TUSS
  • is connected to bus-bar TUGl
  • one element of each of tubes 42 and 43 is connected to bus-bar TU38
  • bus-bar TUUO To each of the tens-units-digits bus-bars TUBO TUBE is connected one element of each of two gas-discharge cold cathode diode tubes.
  • bus-bar TUSS To each of the tens-units-digits bus-bars TU
  • the other element of one of the tubes associated with each tens-units-digits bus-bar TUBO TUSS is connected to one of l0 tens-digit busbars T0 T9 in accordance with the tens digit of the tens-units-digits combination, and the other clement of the second tube associated with each tens-units-digits bus-bar is connected to one of l0 units-digit bus-bars U0 U9 in accordance with the units digit of said combination.
  • an element of tube 40 associated with bus-bar TUBT, assigned to the digit combination 67, is connected to bus-bar T6, to which are also connected corresponding elements of tubes (not shown) associated with other tensunits-digits bus-bars assigned to digit combinations the tens digits of which is 6, and an element of tube 4l, also associated with bus-bar TUST, is connected to units bus-bar U1, to which are also connected corresponding elements of tubes (not shown) lassociated with other tensunits-digits bus-bars assigned to digit combinations the units digit of which is 7.
  • Each bus-bar is supplied with suitable potential, the tens-unitsdigits bus-bars NUOD TUSS with negative potential from battery B3 through resistances,
  • the tens-units-digits busbars TUll TU99, the tens-digit bus-bars T0 T9, and the units-digit bus-bars U0 U9 may be used to serve any number of lines located in any number of central oices since they are employed to indicate digits of directory numbers of lines irrespective of the central offices in which said lines are located.
  • the system may be extended to provide means for indicating directory numbers of more than four digits or other information in regard to a line identified, such as the class of the line or its rate zone.
  • an identifier circuit (shown in Fig. 3) which comprises an indicating tube and an associated registering tube connected through a condenser, to each of the oiice, thousands-digit, hundreds-digit, tens-digit, and units-digit busbars, a pulsing tube, and registers for the office number and for each of the four digits of the directory number.
  • tube 48 is an indicating tube and tube 49 a registering tube associated with thousands-digit bus-bar TH5; tube 50 is an indicating tube and tube 5I a registering tube associated with hundreds-digit busbar H2; tube 52 is an indicating tube and tube 53 a registering tube associated with tens-digit busbar T3, while tube 54 is an indicating tube and tube 55 a registering tube associated with units-l digit bus-bar U8.
  • Tube 56 is the pulsing tube of the identifier comprising the above-mentioned indicating and registering tubes and the other indicating and registering tubes associated with each of the digital bus-bars THU THS; H0...H9;T0...T9andU0...U9.
  • the indicating tubes and the registering tubes are gasdischarge 'triode tubes of the cold cathode type and the pulsing tube is a gas-discharge tetrode tube of the heated cathode type.
  • the registers may be of any suitable type and may each be similar to the register for the units digits, comprising relays R0, R8, R9, CK, and ON, disclosed in Fig. 3.
  • the control anode of each of the indicating tubes for example, tube 54, is supplied with positive potential by positive battery through resistances,51 and 58 and this potential is of such value that said tube will not normally conduct even when its main anode is also supplied with positive potential, but will conduct if, at the same time, the potential of its control anode is slightly raised.
  • the main anodes of all the indicating tubes of Aan identiiier such as tubes 48, 50, 52 and 54, are connected to the cathode of the associated pulsing tube, in this case, tube 56.
  • the anode of the pulsing tube 56 is supplied with alternating po tential from the source 59 through transformer 60.
  • the control grid of said tube is biased by negative battery through resistance 6I so that said tube doe's not normally conduct, but will conduct if the potential of its control grid is made slightly less negative.
  • the main anode of each of the registering tubes, for example, tube 55, is
  • the cathode of the pulsing tube of an identier for example, tube 56, of the identier shown in Fig. 3, is connected through resistance 61 and conductor 68 to sleeve conductor I3 of said line, as extended, at any convenient point in the partially established connection by suitable means, such as relay SI or relay S2.
  • suitable means such as relay SI or relay S2.
  • the control grid of tube 56 is then made, by suitable means such as that hereinafter described, momentarily suiciently less negative to cause said tube to conduct during the positive half of one cycle of alternating current.
  • the sleeve conductor of a subscribers line for
  • conductor I3 is used in automatic telephone systems for other purposes, chief among which is the holding of the magnets of the various switches by which the line is extended.
  • Rectifier 69 provides a path to ground for the negative potential by which said magnets are held but opposes the passage of positive potential.
  • the positive pulse from the cathode of tube 56 will not, ⁇ therefore, pass through rectifier 69 but will be transmitted over conductor 63 through contacts of relay SI or relay S2 to sleeve conductor I3 as extended and to tubes I5 and I6, causing said tubes to conduct, thence by the conduction of tube I5, to bus-bar TH52 and by the conduction of tube I6, to bus-bar TU38.
  • the pulse of positive potential on bus-bar TH52 will cause tubes 22, 23, and 24 to conduct and, by the conduction of tube 22, will be transmitted to bus-bar OFFI, by the conduction of tube 23, to bus-bar TH5, and by the conduction of tube 24, to bus-bar H2.
  • the positive pulse on bus-bar TU38 will cause tubes 42 and 43 to conduct.
  • said positive pulse will be transmitted to bus-bar T3 and, by the conduction of tube 43, to bus-bar U8.
  • the positive pulse on bus-bar U8 will be transmitted over conductor 'I0 and will produce, through condenser 1I a pulse, the magnitude of which will depend upon the rate of change in potential of the pulse applied to said condenser.
  • the pulse from condenser 1I will be transmitted through resistance 51 to the control anode of tube 54, causing said tube to conduct momentarily since, at the same time, a pulse of positive potential is received on the main anode of said tube from the cathode of tube 56.
  • the positive pulse on bus-bars OFFI, THS, H2, and T3 will cause conduction 55,-may be registered by means of a relay circuit such as that shown in Fig. 3 for registering the units-digit indication. Only three register relays R0, R8 and R8 are shown, but it will be understood that the circuit comprises 10 such relays, each connected to a corresponding register tube in the manner shown for relay R8 and tube 55.
  • relay CK now operates over a circuit extending from battery through the winding of said relay, No. 2 contacts of relays RD to R1 (relay RD only being shown), No. 3 front contact of relay R8 and No. 3 back Contact of relay R8 to ground, providing an obvious additional circuit through its contacts for relay ON which prevents release of relay ON.
  • a plurality of identifiers of the type described may be associated with the same bus-bars in the manner described for the identifier comprising the tubes shown in Fig. 3. If the respective pulsing tubes 56 of these identifiers are actuated repeatedly and in succession, no two pulsing tubes being actuated at the same moment, then any or all of said identifiers may be connected to calling lines for identification at the same time and each identifier will identify the line to which it is connected. For example, assume two identiers to be associated with bus-bars U0 to U9. Then to each of bus-bars U0 to U9 will be connected two indicating tubes similar to tube 54 and in the manner shown for tube 54.
  • the main anode of one of said tubes associated with each bus-bar will be connected to the cathode of a pulsing tube, similar to tube 56, of a first identifier, while the main anode of the other of said tubes associated with each bus-bar will be connected to the cathode of a pulsing tube, similar to tube 59, associated with the second identifier.
  • the firstmentioned positive pulse will affect only the iirst of the two indicating tubes connected to bus-bar U6, since the main anode of said tube is, at the moment, supplied with potential from the cathode of said iirst pulsing tube, while the main anode of the second indicating tube is not supplied with potential.
  • the second-mentioned positive pulse will affect only the second of the two indicating tubes connected to bus-bar U1, since the main anode of said tube is, at the m0- ment, supplied with potential from the cathode of said second pulsing tube, while the main anode of the first indicating tube is not supplied with potential,
  • other indicating tubes, and consequently the associated registering tubes are aiected by pulses produced by the associated pulsing tube but are unaffected by pulses produced by the pulsing tubes of othe:- identifiers.
  • FIG. 4 A circuit arrangement for actuating identifiers in rapid succession for the purpose described above is shown in Fig. 4. It includes a pulse generating tube 14 and a circuit of the type known as a thyratron ring, comprising tubes 15, 18, 11, and 18. This circuit is arranged for actuating four identiiiers but, by extention of the thyrairon ring, may be adapted to the actuation of any number of identifiers.
  • One winding of transformer is supplied with alternatlng current over conductors 8
  • Alternating potential from the other winding of transformer 80 is biased by negative potential from the voltage divider composed of resistances 83 and 84 and supplied to the network composed of resistance 85 and condenser 86, the values of which are so chosen that the potentials at rectifiers 81 and 88 have a phase difference of nearly but not exactly degrees.
  • Curves A and B in Fig. 5 show graphically the relative potentials applied to rectifiers 81 and 88, respectively. Said rectifiers are poled so that they oppose transmission of positive potentials.
  • the anode of tube 14 is supplied with voperating potential through the self-clearing anode circuit comprising resistance 90 and condenser 9
  • Tube 14 therefore, conducts for a very short period in each cycle of alternating current, producing, at its cathode, short positive pulses which are transmitted through resistance 92, thence through condensers 93, 94, 95, and 96 and resistances 91, 98, 99 and
  • the control anodes of said tubes are each negatively biased.
  • the control anode of tube 16 is biased by negative battery through resistances
  • the amplitude of the pulses from the cathode of tube 14 is limited by rectier
  • 0 is, however, transmitted through the network composed of resistances
  • the resultant sudden rise of potential at the cathode of tube 16 is transmitted through condenser
  • a part of said rise of potential at the cathode of tube 16 is transmitted through the network composed of resistances
  • tubes 1B, 157 16, 11, 18, conducting in succession indenitely are repeated, tubes 1B, 157 16, 11, 18, conducting in succession indenitely.
  • each time tube 18 conducts, a positive pulse is produced at the cathode of said tube which is transmitted over conductor
  • each bus-bar should be provided with an alarm circuit to give immediate warning of the failure of any of said potentials.
  • Suitable alarm circuits are disclosed in Fig. 2.
  • Each of the thousands-hundredsdigits bus-bars and each of the tens-units-digits bus-bars may be provided with an alarm circuit similar to that shown, as an example, associated with bus-bar TU61.
  • 20 which, in the present embodiment of the invention is a gas-discharge triode tube of the cold cathode type, is supplied with alternating potential from the source
  • 20 is at no time sufiicient to initiate conduction in said tube but is suicient to maintain conduction on negative cycles of alternating current.
  • 20 causes said tube to conduct on negative cycles of alternating current, operating relay AI.
  • 25 which in the present embodiment of the invention is a gas-discharge triode tube of the cold cathode type, is supplied with anode potential in a manner similar to tube
  • a line having an identifying designation, conductors indicative of said designation, means for applying a unidirectional impulse to said line, means for directing said impulse to said conductors, and means for utilizing the change in the magnitude of said impulse on each of said conductors to register the designation of said line.
  • a line having an identifying designation, conductors indicative of said designation, means for applying a unidirectional pulse of electric energy to said line, gasdischarge devices responsive to said pulse to direct said energy to said conductors, and gas-discharge devices responsive to the variation in the potential of said energy on each of said conductors.
  • a line having an identifying designation composed of digits a gas-discharge pulse generator, means for applying a pulse from said pulse generator to said line, gas-discharge devices responsive to said pulse to transmit said pulse over paths indicative of the digits of said designation, other gas-discharge devices responsive to said pulse on each of said paths for indicating the digits of said designation, and means for registering each of said indications, Y
  • a line having an identifying designation composed of digits a gas-discharge pulse generator, means for applying a pulse from said generator to said line, a rst group of gas-discharge devices associated with said line for directing said pulse over paths in aecordance With combinations of the digits of said designation, a second group of gas-discharge devices associated With said paths for directing said pulse over other paths in accordance with the individual digits of said combinations of digits, and a third group of gas-discharge devices responsive to said pulse on each of said other paths.
  • a pulse generator comprising gas-discharge devices, means for applying a pulse from said generator to any one of said lines, a rst group of gas-discharge devices associated with said line for directing said pulse over paths indicative of the designation of said line, a second group of gas-discharge devices common to all of said lines for directing said pulse over other paths indicative of the designation of said line, and a third group of gas-discharge devices comtaneously to one of said lines and to all of said receiving devices, means for directing said pulse from said line to said receiving devices in accordance with the designation of said line. and means responsive to the change in magnitude of the pulse applied to said line for registering the coincidence at each of said receiving devices of the pulse applied to said receiving device and the pulse directed to said receiving device from said line.
  • a system for identifying telephone lines lines each having an identifying designation composed of digits, a plurality of gas-discharge receiving devices, means for applying a pulse simultaneously to any one of said lines and to all of said receiving devices, gas-discharge devices associated with each of said lines for transmitting said pulse, gas-discharge devices common to all of said lines for transmitting said pulse to said receiving devices in accordance with the designation of the line to which said pulse is applied, and means for registering the coincidence at each of said receiving devices of the pulse applied to said receiving device and the pulse transmitted to said receiving device from said line.
  • a plurality of identifying circuits each responsive to the variation in the magnitude of a unidirectional impulse of short duration, means for generating such impulses, means for connecting each of said identifying circuits to one of said lines, and means for applying an impulse successively to each of said identifying circuits to indicate the designations of said lines.
  • a system for identifying telephone lines in combination with lines having identifying designations, gas-discharge devices associated with each line for identifying said line, gas-discharge devices common to all of said lines for identifying any of said lines, a plurality of identifying circuits each capable of being made responsive to impulses transmitted through said gas-discharge devices from any one of said lines, means for successively making responsive each of said identifying circuits and simultaneously applying impulses to said lines, and means for registering the response of each of said identifying circuits.
  • individual conductors having arbitrary designations, common conductors, and means for directing and varying the magnitude of a unidirectional impulse applied to one of said individual conductors selectively to said common conductors to identify the arbitrary designation of said individual conductor.
  • individual conductors having arbitrary designations, common conductors, and electronic devices for directing and varying the magnitude of a unidirectional impulse applied to one of said individual conductors selectively to said common conductors to identify the arbitrary designation of said individual conductor.
  • individual conductors having arbitrary designations, and common conductors each having an indicating device responsive to the variation in the magnitude of a unidirectional imnulse applied to one of said individual conductors and selectably directed to said common conductors to identify the arbitrary designations of said individual conductor by the operation of the indicating devices of the common conductors to which said impulse is directed.
  • individual conductors having arbitrary designations, common conductors.
  • electronic devices for selectably directing a unidirectional impulse applied to one of said individual conductors to said common conductors in accordance with the arbitrary designation oi' said individual conductor, and electronic devices responsive to the variation in the magnitude oi' said impulse to indicate said designation.
  • a system for the identification of telephone lines a plurality of groups of lines, a common conductor corresponding to each of said grouns.
  • electronic devices seiectably connecting said lines to said common conductors, and means for applying a unidirectional impulse of varying magnitude to one of said lines to indicate the groun of which said line is a part.
  • a rst group of common conductors for combinations of thousands and hundreds digits of said designations, a second group of common conductors for combinations of tens and units digits of said designations.
  • electronic devices connecting said lines to said first group of common conductors in accordance with the thousands and hundreds digits of their respective designations.
  • electronic devices connecting said lines to said second group of common conductors in accordance with the tens and units digits of their respective designations, a third group of common conductors for thousands digital values of said designations.
  • a fourth group of common conductors for hundreds digital values of said designations, electronic devices connecting said first group of common conductors to said third and fourth groups of common conductors in accordance with -the thousands and hundreds digits respectively of said designations, a fifth group of common conductors for tens digital values of said designations, a sixth group of common conductors for units digital values of said designations, electronic devices connecting said second group of common conductors to said fth and sixth groups of common conductors in accordance with the tens and units digits respectively of said designations, and means for applying potential to one of said lines whereby certain of said electronic devices are operated to indicate the designation of said line.
  • a plurality of groups of lines having numerical designations, a first common conductor for each combination of thousands and hundreds digits of said designations in each of said groups, electronic devices connecting each of said lines to one of said iirst common conductors in accordance with the thousands and hundreds digits of the designation of said line and the group in which said line is located, a second common conductor for each of said line groups, a third common conductor for each thousands digital value of said designations, a fourth common conductor for each hundreds digital value of said designations, electronic devices connecting each of said rst common conductors to one of said second common conductors, one of said third common conductors and one of said fourth common conductors in accordance with the line group, the thousands digit, and the hundreds digit of said designations, respectively, a fifth common conductor for each combination of tens and units digits of said designations, electronic devices connecting each of said lines to one of said fifth common conductors in accordance .with
  • sixth common conductor for each tens digital value of said designations, a seventh common conductor for each units digital value of said designations, ⁇ electronic devices connecting each of said fifth common conductors to one of said sixth common conductors and one of said seventh common conductors in accordance with the tens digit and the units digit of said designations, respectively, and means for applying potential to one of said lines whereby certain of said electronic devices are operated to indicate the designation of said line.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Alarm Systems (AREA)
US670358A 1946-05-17 1946-05-17 Directory number calling line identifier Expired - Lifetime US2484612A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE473095D BE473095A (en(2012)) 1946-05-17
US670358A US2484612A (en) 1946-05-17 1946-05-17 Directory number calling line identifier
FR944777D FR944777A (fr) 1946-05-17 1947-04-08 Perfectionnements aux systèmes téléphoniques, notamment en vue de l'identification des lignes d'appel
CH277163D CH277163A (de) 1946-05-17 1947-04-26 Telephonanlage mit Mitteln zum Ausmitteln von anrufenden, mit je einer Bezeichnung versehenen Linien.
GB12635/47A GB650774A (en) 1946-05-17 1947-05-09 Line designation identifying means
US51591A US2590514A (en) 1946-05-17 1948-09-28 Pulsing circuit

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US670358A US2484612A (en) 1946-05-17 1946-05-17 Directory number calling line identifier

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US2484612A true US2484612A (en) 1949-10-11

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CH (1) CH277163A (en(2012))
FR (1) FR944777A (en(2012))
GB (1) GB650774A (en(2012))

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561051A (en) * 1949-06-02 1951-07-17 Int Standard Electric Corp Group selection control circuit
US2570971A (en) * 1947-11-14 1951-10-09 Bell Telephone Labor Inc Vertical line number translator
US2587426A (en) * 1950-04-28 1952-02-26 Atomic Energy Commission Pulse forming network
US2594505A (en) * 1949-12-09 1952-04-29 Bell Telephone Labor Inc Calling line identification and registering system
US2600502A (en) * 1948-04-24 1952-06-17 Bell Telephone Labor Inc Calling line and private branch exchange line identifier
US2619545A (en) * 1947-06-13 1952-11-25 Bell Telephone Labor Inc Telephone calling line identification and recording system
US2629016A (en) * 1942-06-27 1953-02-17 Bell Telephone Labor Inc Automatic toll-ticketing system
US2639092A (en) * 1947-09-04 1953-05-19 Bell Telephone Labor Inc Automatic message accounting system
US2639330A (en) * 1949-03-04 1953-05-19 Automatic Elect Lab Calling line identification apparatus
US2694753A (en) * 1949-12-30 1954-11-16 Int Standard Electric Corp System of identification of the calling line in telephone systems and the like
US2724019A (en) * 1950-10-13 1955-11-15 Int Standard Electric Corp Automatic telephone systems
US2748283A (en) * 1953-08-19 1956-05-29 Bell Telephone Labor Inc Frequency multiplier apparatus
US2767246A (en) * 1947-09-04 1956-10-16 Bell Telephone Labor Inc Automatic message accounting system
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US2881260A (en) * 1952-03-12 1959-04-07 Gen Telephone Lab Inc Automatic telephone systems involving toll-recording facilities
US2886642A (en) * 1953-04-13 1959-05-12 Gen Dynamics Corp Automatic toll ticketing
US2913530A (en) * 1953-07-03 1959-11-17 Int Standard Electric Corp Line identification in telecommunication systems
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US1841084A (en) * 1930-04-19 1932-01-12 Bell Telephone Labor Inc Telephone system
US2005595A (en) * 1932-10-21 1935-06-18 Western Electric Co Telephone system
US2226459A (en) * 1935-11-23 1940-12-24 Philco Radio & Television Corp Signal-deriving circuit
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Cited By (18)

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Publication number Priority date Publication date Assignee Title
US2629016A (en) * 1942-06-27 1953-02-17 Bell Telephone Labor Inc Automatic toll-ticketing system
US2619545A (en) * 1947-06-13 1952-11-25 Bell Telephone Labor Inc Telephone calling line identification and recording system
US2767246A (en) * 1947-09-04 1956-10-16 Bell Telephone Labor Inc Automatic message accounting system
US2639092A (en) * 1947-09-04 1953-05-19 Bell Telephone Labor Inc Automatic message accounting system
US2570971A (en) * 1947-11-14 1951-10-09 Bell Telephone Labor Inc Vertical line number translator
US2600502A (en) * 1948-04-24 1952-06-17 Bell Telephone Labor Inc Calling line and private branch exchange line identifier
US2639330A (en) * 1949-03-04 1953-05-19 Automatic Elect Lab Calling line identification apparatus
US2561051A (en) * 1949-06-02 1951-07-17 Int Standard Electric Corp Group selection control circuit
US2594505A (en) * 1949-12-09 1952-04-29 Bell Telephone Labor Inc Calling line identification and registering system
US2694753A (en) * 1949-12-30 1954-11-16 Int Standard Electric Corp System of identification of the calling line in telephone systems and the like
US2587426A (en) * 1950-04-28 1952-02-26 Atomic Energy Commission Pulse forming network
US2724019A (en) * 1950-10-13 1955-11-15 Int Standard Electric Corp Automatic telephone systems
US2851531A (en) * 1952-03-12 1958-09-09 Gen Telephone Lab Inc Automatic telephone systems involving toll recording facilities
US2881260A (en) * 1952-03-12 1959-04-07 Gen Telephone Lab Inc Automatic telephone systems involving toll-recording facilities
US2886642A (en) * 1953-04-13 1959-05-12 Gen Dynamics Corp Automatic toll ticketing
US2913530A (en) * 1953-07-03 1959-11-17 Int Standard Electric Corp Line identification in telecommunication systems
US2748283A (en) * 1953-08-19 1956-05-29 Bell Telephone Labor Inc Frequency multiplier apparatus
US3133156A (en) * 1960-10-31 1964-05-12 Bell Telephone Labor Inc Telephone line concentrator

Also Published As

Publication number Publication date
BE473095A (en(2012))
GB650774A (en) 1951-03-07
FR944777A (fr) 1949-04-14
CH277163A (de) 1951-08-15

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