US2148915A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2148915A
US2148915A US17962A US1796235A US2148915A US 2148915 A US2148915 A US 2148915A US 17962 A US17962 A US 17962A US 1796235 A US1796235 A US 1796235A US 2148915 A US2148915 A US 2148915A
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Prior art keywords
relay
circuit
current
cycles per
cycle
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Expired - Lifetime
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US17962A
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English (en)
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Trechcinski Roman
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Definitions

  • this system provides asufiicient security.
  • the primary'object of the present invention is to provide a device which considerably decreases the probability of the occurrence of faults of the aforesaid kind, and. which is based on the ap:
  • my improved system of transferring impulses and signals through lines comprises in combination: a transmitting apparatus having one generator only; means associated with this generator for enabling it to supply and forward through the line signals eachformed by a succession of several, i'. e. at least two, currents of' different definite fixed frequencies-the order of succession of. these currents, the time of duration of eachof them, and the number.
  • the receiving apparatus will not react on one vibration of some fixed frequency only, and will act only when after a previous transmitting of this vibration of 10 the current having some fixed frequency, there is created another current of a difierent but again strictly fixed frequency.
  • the succession in which the separate frequencies are created, as well as the length of time of the duration of the separate vibrations are applied in order to receive various signals and impulses.
  • Fig. 1 shows a simplified scheme of cord connecting circuit.
  • Figs, 4 and 5 give the scheme of an equipment according to the invention, Fig. 4 showing the transmitting side and Fig. 5 the receiving side of the equipment.
  • Fig. 2- shows the connections by means of which equipments shown in Figs. 1, 4 and 5 co-operate with one another.
  • Fig. -3 shows the diagram of the transmitted current.
  • Fig. 6 illustrates a scheme of a device adjusting the receiving repeater filter successively to the reception of separate frequencies.
  • relay TSI forming together with the self-inductance Sz'3 the time factor at about 300 milliseconds provided for warming up of the valves and the stabilization of the work of the valve generator, will operate and connect the valve generator to the line as per circuit 5:
  • Fig. 4 the top transformer terminal Tr2, TS3 TSI TQ2 term. I, strips HIIV, line, terminal 2, strips IIIIV. TQZ TSl T33 bottom terminal Tr2.
  • Circuit 6 is closed as the result of the operation of the relay TSI.
  • Fig. 4 Si l, TS2, TSI in consequence G 3 and 4; at the two parallelly connected con- 0'7: Fig. 4: Si5, TS3, TSZ
  • relay TSZ operates disconnecting contact TS2, separating GT2, causing an immediate break in transmitting of the 500 cycles per second currentinstead of which the current of a 1000 cycles per second frequency will be transmitted.
  • relay TS3 operates and will cut the circuit and 5 thus causing a break in the transmitting of the current to the line.
  • the filter of the in-coming repeater consists of self-inductions Si6, Si'l, Si8 and condensers botdensers GT3 and CM this filter lets the 500 cycles per second current through, but in case of a disconnected Cr4the 1000 cyclesper second current. At the described moment both condensers are. parallelly connected, consequently the filter accepts then 500 cycles per second.
  • the relay RN is quickly acting (about 3 milliseconds) and disconnects sooner the contact RN before the relay RU has time to operate on circuit 9
  • Fig, 5 top terminal T14, RA filter RU,RI-I,
  • the relay HR is quicklyacting (about 3 milliseconds) and before RU has time to be de-magnetized (from the additional circuit 12:
  • Fig. 5 bottom coiling of the opposite winding relay RU, RU, RH,
  • relay RA releases, in consequence of which circuits 9 and.
  • Fig. 5 terminal I, strips IX-X, Si9, RK RH terminal 2, strips IX-X.
  • the alarmed telephone exchange or central station puts up then an alarming lcallsignal, e. g. in the form of a current of 200 cycles per second frequency. This current is to signal the calling subscriber the possibility of starting the the r y T JJ- ig-. whi h ne ai qmrqu h l.
  • Fig. 4 TQLTKa TJl relay TQI operates
  • Fig. 4 top terminal TrZ, TQI RQZ terminal I, strips III IV, line, and back, terminal 2, strips ZUIIV, TQZ TQ l and bottom terminal Trl.
  • the condenser Cr2 is connected to the circuit 21: r
  • this line will be then successively fed by the current vibrations of 500 or 1000 cycles per second and the number of the 1000 cycle vibrations will be equal to the number of impulses in the subscribers series.
  • vThe termination signal takes place as follows: when the subscriber puts the hand-set on the forks, TJ l releases. If the repeater has no special apparatus with a registration of impulses from the subscriber and forwarding them after cumulation, then the described simple device in the out-going repeater at the hanging up of the hand-set, will forward one superfluous impulse in the form of vibrations: the 500 cycles per second and then the 1000 cycles per second. In the meanwhile, however, one cord circuit line in the central will be released and the relay TC may release within some undefined time what would cause undesirable (faulty) signals,
  • TBI has a delayed activity and keeps TC as per circuit 25:
  • circuit 2 is cut: TSI releases and a 1000 cycle vibration is forwarded; then circuit 6 is cut and TCZ releases after about 200 milliseconds altering the 1000 cycle current into a 500 cycle current.
  • the termination signal is forwarded in the form of 2 vibrations: at first one of 1000 cycles per second and then one of 500 cycles per second.
  • the incoming repeater (receiving) accepts a 1000 cycle vibration by means of a filter through the relay RH which operates and closes circuit 27:
  • +,RS,RH ,RQ relay RS operates receiving because of the opening of the contact RS an additional minus for RK; then, if after the fading of the 1000 cycle vibration the 500 cycle vibration occurs and the relay RN becomes active by opening its contact RN taking off the current from the relay RK, the latter, in consequence of the loss of the additional minus from RS releases sooner than RS (with a delayed activity) will have time to release because of the inactivity of RH and gives it back its minus; the subscribers loop is out.
  • Therm-tone system may have not only a theoretical, but also a practicalapplication. However, the apparatus for the separate processes is simpler when applying a trio-tone system, which, in principle, differs only very little 105 from the duo-tone system.
  • Thesignaling currents may be of e. g. three following frequencies: 500, 1000 and 1500 cycles 25;per second.
  • Fig. 6 is shown a scheme of a device adjusting the receiving repeater filter sue-- cessively to the reception of separate frequencies; in this case all terminals of the strips XL-XII with the exception of terminal I to which the plus 30 ;pole of the storage batte'ry'is connected, should be understood as:insulated; the relays RVI and RV2 are not necessary.
  • the relay RA After receiving by the aperiodic amplifier of the receiving repeater of the 500 cycle vibration 351current, the relay RA operates, consequently, be-
  • Fig. 6 from TM, RN (through the rectify ing device) RUl,RA to Tr' l; v and .cuts the minus pole from the relay RUI. which remains inactive and will operate only 45 ,then, when after cutting of the vibration of the 500 cycle current and altering the same by the 1000 cycles per second current, the relay RN- will'release; the circuit29 will be closed then:
  • the relay RM becomes in-.
  • the relay RUZ operates opening the contact RUE cutting off C15 and byeclosing the contact RU2, switches over the filter to the relay RH.
  • the filter begins to let 75 !through .the 1500 cycle current which is. accept:
  • ozeiri 6 topcoiling RHI, RAE, Rug- I osmrigcz from TM, RM, RU2 RUl RAP,
  • wired RUI will receive the current from its own plus and 'minus through RU3 then the relay RUI releases and circuits 31 and 33 are cancelled, in view of which RU2 and RU3 become inactive and because of the connecting back of condensers CM and C15 the filter is adapted for the reception of the 500 cycle per second current and a collaborationwith RN.
  • this device will successively connect the line currents to the proper relays, altering the properties of the filter by the contacts RUl RU2 separating the condensers C14 and GT;
  • the duo-tone system might be more convenient than the trio-tone system.
  • a passing over from a trio-tone system to a duo-tone and the necessary changing of. a receiving repeater from a trioto a duo-tone there is foreseen a device consisting of relays RVI and RV2 (terminals of strips 'X[XII are now not insulated).
  • the repeater is in each case transformed into a duo-tone, if after a former appearance of" a" 500cycle current a 1000 cycle current is received; in all other combinations a 1500, 1000,
  • RVI right ventricular pressure
  • RN right ventricular pressure
  • -:"consequently RVI operates.
  • RVLRVIgRM relay RVZ operates and opening the contact RVZ takes the plus pole from the storage battery to the relay RU2 which, afterdisappearing of the 1000 cycle vibration, when RM releases, cannot operate in the circuit 31,.and owing t the closed RV2, circuit 36 is closed: 036: Fig. 6: RUI, RUl RUZ-l RV2, RM",
  • relays for the adape tation of filters and connection of the separate receiving apparatus
  • other relays may be applied, .e. g; valve devices; these apparatus, as quite non-essential for the above system, were not described at all.
  • the whole system is understood as acting on both sides.
  • Iclaim System of transferring impulses and signals throughJines, particularly for usewith amplithe disappearance of the 1000 cycles per second bombs for manual, half-automatic and full-automatic telephony, comprising in combination: a transmitting apparatus having one generator only; means associated with this generator for enabling it to supply and forward through the line signals each formed by a succession of severa], 1. e.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
US17962A 1934-04-28 1935-04-24 Telephone system Expired - Lifetime US2148915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL2148915X 1934-04-28

Publications (1)

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US2148915A true US2148915A (en) 1939-02-28

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US17962A Expired - Lifetime US2148915A (en) 1934-04-28 1935-04-24 Telephone system

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US (1) US2148915A (enrdf_load_stackoverflow)
SE (1) SE89578C1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579469A (en) * 1939-03-24 1951-12-25 Int Standard Electric Corp Revertive calling party line system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579469A (en) * 1939-03-24 1951-12-25 Int Standard Electric Corp Revertive calling party line system

Also Published As

Publication number Publication date
SE89578C1 (enrdf_load_stackoverflow) 1937-06-29

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