US2318267A - Telephone line identification - Google Patents

Telephone line identification Download PDF

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Publication number
US2318267A
US2318267A US370362A US37036240A US2318267A US 2318267 A US2318267 A US 2318267A US 370362 A US370362 A US 370362A US 37036240 A US37036240 A US 37036240A US 2318267 A US2318267 A US 2318267A
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United States
Prior art keywords
relay
over
switch
operated
circuit
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Expired - Lifetime
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US370362A
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English (en)
Inventor
Taylor Reginald
Baker George Thomas
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Associated Telephone and Telegraph Co
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Associated Telephone and Telegraph Co
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Application filed by Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator
    • 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

Definitions

  • the present invention relates to telephone systems, and is more particularly concerned with such systems in which calling line identification equipment is provided by means of which the identity of a subscriber who has initiated a call to an operator, for instance a toll, trunk or phonogram operator, may be obtained automatically, thus rendering unnecessary the demanding and verification of the number of the calling line.
  • an operator for instance a toll, trunk or phonogram operator
  • the general object of the invention is to provide an improved means of advising an operator of the identity of a calling line or point and according to the invention a verbal announcement scheme is employed in which the identity of a line is first caused to be transmitted to a storage de vice which in turn causes Voice currents corresponding to the identifying characteristics of the line to be connected up successively to an operators or attendants position to cause audible sounds to be produced in correct order correspending to the identity of the line.
  • a manually operated switching device is adapted to initiate the operation of the identification equipment which after storage causes an audible announcement of each digit or other identifying characteristics to be made by a telephone receiver.
  • each operator is provided with a position circuit shown at the bottom of Fig. 4 and .a number of plug ended cord circuits with associated monitoring and speaking keys of which one is shown at the top of Fig. 4.
  • the cord circuit corresponding thereto is connected to the position circuit with which all the necessary facilities such as busy test, dialling, key-sending and the like are associated.
  • each operators position has-associated with it additional equipment which connects with th common leads extending between her cord circuits and her'position circuit, and leads to a known form of electrical speech reproducer, for instance of the type used in speaking clocks and the like, and employing ten speech coils designated 1-0.
  • these coils are induced at periodic intervals, for instance at half second intervals, the corresponding audible digits 1-0, equipment being provided whereby the operator is connected up to various speech coils in turn-in accordance with the particular calling number transmitted forward from the calling line'identification equipment at the calling exchange.
  • Relay SK in operating operates at .9702 a relay SKR and as a result an earth is extended on to the MN common at skrl, and in this instance in addition to existing relay MN being ope'rated in the position circuit, a relay HR in'the verbal announcement equipment is operated over contact grZ which in turn energises relay SP via the home contact I of the bank RI of the switch It and con tacts hrl tbl and sw l.
  • Theoperator now receives the subscribers request and if this is such as to require iden'tifica tion as will be the usual case at atoll, trunk'or phonogram position, she will momentarily depress the receive identification key KR!
  • Relay SW is thereupon operated over KRII and locks via bank and wiper RI and disconnects the slugged relay SP at swl while at stud and S105 it disconnects the secondary of transformer STR in operators set from the talking leads and connects these leads to the tone commons over contacts of switches WS, XS, YS, ZS.
  • a -cycle pulse is sent back over leads l5 and [6 (Fig.
  • This equipment will preferably be of 321,783, filed March 1, 1940, by which it is possible to identify a plurality of lines simultaneously, and which transmits the identity of a calling party forward on a code pulsing basis.
  • the code employed is of' the well-known i-unit type and necessitates the transmission of four pulses per digit, each setof four pulses being effective at the main exchange on a group of storage relays W, X, Y, Z, the storage relays for the first digit of a number being designated WA, XA, and for the second digit WIB, XB and so on.
  • the storage relays WAZA are operated in the following combinations in response to the first digit:
  • the equipment shown is capable of receiving up to six digits and therefore sixv sets of storage relays are provided, access to each of the twentyfour storage relays being had over a -point receiving switch R. If it was desired to cater for more than six digits a 50-point receiving switch would conveniently be used and the appropriate storage relays added.
  • the identification equipment on determining the identity of the calling party will transmit forward to the verbal announcement equipment a train of twenty-four pulses comprising six sets of four pulses each and utilising for every pulse a 50- cycle frequency. On certain pulses a 150-cycle frequency will be transmitted in addition in order to bring about the operation of particular storage relays in each set.
  • the 50-cycle frequency which is transmitted during every pulse operates a suitably tuned relay PA which at contact pal completes a pulsing circuit for magnet RM to advance the receiving switch R step-by-step through its twenty-four positions, after leaving its first position the circuit for relay SW is maintained over M3 and the commoned bank contacts engaged by Wiper RI.
  • the l50,cycle pulse is transmitted at the same time and brings about the operation of relay PB in addition to relay PA, so that earth is extended over contact pbl, wiper and bank R4 to energise the appropriate storage relay WA, XA, WB, XB, etc.
  • the energised relays lock operated over contacts such as wal, xal, yal, eal to common lead I! to which earth is connected by M5.
  • relay PC operates on energisation of the magnet over rm: and hr2 and thereupon looks at pol and at the same time maintains an operating circuit to the magnet over pol until the magnet interrupter contacts open when it releases and opens the magnet energising circuit.
  • the third, sixth and seventh pulses received will comprise both the 50-cyc1e and lSQ-cycle frequencies, so that relay PB will operate in these positions of the R switch wiper and will bring up relays YA, KB and YB.
  • the equipment caters for a maximum of six digits, but in order that the equipment may cater for mixed numbering schemes employing say 4, 5 and 6 digit numbers, automatic cut-01f facilities are provided which after a short delay release relay SW after either a 4, 5 or 6 digit number.
  • in addition to contact 25 which the wiper RI reaches after receipt of a 6 digit number, do not provide any circuit for relay SW, and hence if the subscriber's number consists of four or five digits only, the, R switch will stop on one of these contacts and relay SW will release after an interval governed by its slug.
  • the number consists of more than the number of digits which have brought the wiper to such a contact relay SW will hold operated during the transit of wiper Rl over these'contacts, since the speed of pulsing is such that the wiper is on each contact for a period less than the holding time of relay SW.
  • the operator may pick up the subscriber's identification. She may, if preferred, proceed with the building up of the connection to the called party or alternatively she may obtain the calling subscribers number immediately by depressing the locking Identification key Kl.
  • Relay MN in the position circuit is thereupon released at contact K12 and relay M therein is operated over K12, lead M, contact mnl by the earth extended from the cord circuit over ski-l, and as a result the operators receiver OR is connected up to the high impedance secondary winding of the monitoring transformer MTR, the primary windings of which connect up over mnZ and mn3 to leads MT and MR and hence through the armatures of switching relays WS, XS, YS and ZS to the speech coils 1-0 of the speech machine.
  • the operators monitoring coil in preference to the ordinary speech transformer STR has been selected for announcing the number of a calling party, since due to its high impedance it provides the least load on the speech machine, and also prevents any noise from being propagated on to the speech machine commons from the operators transmitter OT as would be the case if the ordinary operators telephone circuit were utilised over STR.
  • Other contacts K13 of key KI disconnect the monitoring commons MT and MR to avoid interference by the monitoring Keys on other cord circuits.
  • the transmitter OT is shown connected in series with a battery feed coil BFC in series with relay OR and primary of STR but this forms no part of the present invention and could be replaced by any known operators set.
  • wiper R3 will be standing on the 5th contact or on some contact beyond this and battery through resistance and contact KII is thereupon extended over wiper and bank R3 to relay IG, contact hM, first contact and wiper SI of switch S.
  • Relay IG locks up over contacts hrd and ig2 and controls amongst other things the extension of pulses over ig3, wiper S2 to the magnet SM of the audible digit transmission wiper S2.
  • relay ST At contact igl a circuit is closed for relay ST from battery and resistance connected to commons M to commons I3 connected to relay ST which at stl connects up a pulsing circuit from cam contacts SMC to relay PAS.
  • relay ST is common to a number of such equipments relay PAS might be already pulsing and in order that magnet SM shall not receive:
  • relay IG shall only operate during a time when relay PAS is de-energised and contact Pasl opens to remove;
  • Relay IG also at contacts 1'95, ig6, igl, ig8 connects up relays WS, XS, YS, ZS to wipers S3, S4, S5, S6 respectively.
  • Relay YS in operating connects up the monitoring commons MT and MR over wsl and zsl, ,rsl and ysZ, 11.93 and 11.94, as 3 and ws3 to speech coil 3 and digit 3 is thereupon verbally communicated to the operator during the next on period of the tone commons.
  • the operator will receive the second digit 8 and so on, the switch S stepping on its wipers during each silent period and operating the relays WSZS in accordance with the succeeding stored digit so that the operator will thus hear a successive series of audible digits corresponding to the callin subscriber's number.
  • the switch S will continue to step a number of contacts corresponding to the maximum number of digits in the area, and if the calling subscriber has less than six digits in his number certain of the later contacts will be silent, since no storage relays will be operated.
  • the switch has stepped through the maximum number of contacts catered for, no further circuit can be completed to its magnet, and it will remain in this position until key KI is restored and relay IG released whereupon a stepping circuit will be completed for magnet SM over wiper SI, contact 2'94, interrupter contacts sm, magnet SM to battery, when switch S will automatically rotate to the home position.
  • the storage relays WA, etc. remain looked over their respective contacts wal, etc., and contact hr5 until the cord circuit speaking key KS is restored.
  • the opening of contacts KS! of the cord circuit speaking key removes a short circuit across the relay GR which exists over lead sH, skr2, key KSI, lead SKL, contact yr?) and wipers R2 and ST and their contacts in parallel when in ofi-normal position and includes contact gr3 and leads SKL.
  • Relay GR may now operate from the earth extended to'its upper side via the low resistance winding of relay SK in the cord circuit contact slcr2'to a battery in the operators position circuit which is connected on to its lower side via lead SKL and banks and wipers R2 and S1 in parallel. It should be mentioned that the purpose of the short circuit is to prevent slipping of the last train of impulses transmitted for setting up the connections should the operator prematurely replace the speaking key and actually both key DAKl and relay DB and its contact do not form a material part of the invention.
  • Relay GR in operating extends an earth back over lead SH to short circuit and release the switching relay SK in the cord circuit and so remove the connection at'skS and 8M to the leads between the answering plug to the calling plug. At the same time it guards the position circuit against seizure by any other cord circuit on a position at grl, and at armature grd it connects the verbal announcement equipment supervisory lamp LP to circuit H to cause it to light while at contact gr? it releases relay HR.
  • relay GR releases and the verbal announcement equipment and .position equipment are then free for further use.
  • switch R will fail'to step and relay SW will remain locked.
  • the time delay relays TA and TB then come into operation in well known manner over cam contacts S and Z, contacts sw3 and 1502 respectively.
  • Relay TA being maintained operated over ml and sw2 until relay TB is energised and relay TB at con tact tbl releases relay SW and at contact 15122 connects lead In to flash the supervisory lamp LP on the position circuit so as to inform the operator that she must obtain the calling number direct from the subscriber and at contact tb3 to connect up a slow acting alarm circuit over commons [2.
  • the invention provides a very ready means by which the setting up of long distance or other calls requiring recording can be facilitated, and although it has been described in connection with the verbal announcement to an operator of the number of a calling subscriber, it may be used in other circumstances for verbally announcing the identity of a calling line or point. For example, it has further use in telephone systems for verbally announcing to an operator, maintenance ofiicer or test clerk, the identity of a faulty line on which calling conditions are simulated.
  • a line over which two trains of impulses are transmitted concurrently a plurality of devices, a switch operated by one of said trains of impulses to connect up each of said devices in turn, means responsive to each impulse of said other train for operating the one of said devices which is connected up by said switch at the time that impulse is received, means effective after said switch has connected up all of said devices for deter mining which of said devices are operated, and means controlled by said devices for making audible announcements of difierent digits depending upon the devices operated.
  • a plurality of registers a switch operated to connect'with said registers in succession, means for operating any of said registers over said switch when said switch connects with that register, whereby said registers may be operated in a variable combination, means effective after said switch has connected with all of said registers for then testing said registers simultaneously, and means controlled by said testing means for making an audible announcement of any digit, the digit announced depending upon the combination in which said registers are found to be operated at the time tested.
  • a telephone or like system a plurality of devices, a switch operated to connect with said devices in succession, means for operating any of said devices over said switch when said switch connects with that device, means for testing said devices in groups, said last means effective to test all of the devices in each group at once and to test different groups successively, and means governed in accordance with the test on each group of devices for making an audible announce of any digit, the digit announced depending upon which one or more devices in the tested group are found to be operated.
  • an operators position at which terminate lines over which impulse codes corresponding to diiierent digits are transmitted to said position a cord circuit at said position operable to connect with any of said lines, means associated with said position and effective, when said cord circuit is connected to one of said lines, to receive over said cord circuit an impulse code transmitted to said position over said line, a device manually operated by the operator at said position after saidcode has been received, and means rendered effective by the operation of said device and controlled by said first means for translating said received code into an audible announcement of the digit corresponding to said code.
  • a connection is extended from a subscribers line to an operators position and wherein two trains of impulses thereafter are transmitted concurrently tosaid position over said connection
  • a plurality of devices associated with said position, a switch at said position operated by one of said trains of impulses to connect up each of said devices in turn, means responsive to each impulse of said other train for operating the one of said devices which is connected up by said switch at the time that impulse is received, means effective after said switch has connected up all of said devices for determining which of said devices are operated, and means controlled by said devices for making audible announcements of different digits depending upon the devices operated.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
US370362A 1940-01-04 1940-12-16 Telephone line identification Expired - Lifetime US2318267A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB210/40A GB537050A (en) 1940-01-04 1940-01-04 Improvements in or relating to line identification for telephone systems

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US2318267A true US2318267A (en) 1943-05-04

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US370362A Expired - Lifetime US2318267A (en) 1940-01-04 1940-12-16 Telephone line identification

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FR (1) FR932148A (en))
GB (1) GB537050A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499776A (en) * 1946-05-27 1950-03-07 Teletype Corp Audible telephonic line identification
US3536839A (en) * 1968-10-11 1970-10-27 Bell Telephone Labor Inc Answer tone detection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499776A (en) * 1946-05-27 1950-03-07 Teletype Corp Audible telephonic line identification
US3536839A (en) * 1968-10-11 1970-10-27 Bell Telephone Labor Inc Answer tone detection circuit

Also Published As

Publication number Publication date
FR932148A (fr) 1948-03-12
GB537050A (en) 1941-06-06
BE464870A (en))

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