US2606251A - Signaling system for telegraph links - Google Patents

Signaling system for telegraph links Download PDF

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Publication number
US2606251A
US2606251A US767521A US76752147A US2606251A US 2606251 A US2606251 A US 2606251A US 767521 A US767521 A US 767521A US 76752147 A US76752147 A US 76752147A US 2606251 A US2606251 A US 2606251A
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United States
Prior art keywords
condenser
armature
telegraph
relay
signalling
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Expired - Lifetime
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US767521A
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English (en)
Inventor
Roelof M M Oberman
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Individual
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Individual
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Publication of US2606251A publication Critical patent/US2606251A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details

Definitions

  • the invention refers to signalling in a telegraph system which preferably uses teleprintpurpose of the invention is to efiect special signals on a connection e. g. for closing a connection or for operating a particular device in the connection as for instance a monitoring set or a time indicator under the control of this thirtysecond telegraph signal.
  • the purpose of the invention is the provision of a signalling system in which particular signals can be sent while using ordinary teleprinters without undesired signals being printed.
  • the system of the invention uses to this efiect a supervisory device on the transmission relay armaturcs which can only operate on telegraph signals all of which have equal signalling elements, e. g. mark.
  • the key set of the printers should be provided with a key which emits, when operated, the signalling combination consisting in the usual five-unit code of a starting element (mark), five marking. signal elements and a stop element (space). This is therefore a normal signal on which the printers start, but do not print.
  • the system of the invention presents the advantage that the printing of undesired signals is prevented during the transmission of the special signal without requiring any special constructions in the teleprinter.
  • Fig. 1 shows the principle of the signalling circu1
  • Fig. 2 shows the principle of Fig. 1 with a tube added;
  • Fig. 3 is the circuit of Fig. 1 with a cold cathode gas tube
  • Fig. 4 shows a variation of Fig. 2.
  • the armature a of a polar receiving relay A is supervised in Fig. 1 by the relay LA.
  • the relay A being commutated by the line altemations connects its tongue alternatively to and telegraph battery.
  • Tongue a receives 32 signals in the manner described, every signal being preceded by a start element and followed by a stop element, the teleprinter reacting to 31 of the 32 signals, but not to the thirty-second.
  • the circuit of the invention reacts to this thirty second signal and by sending it a response may be obtained at the receiver resulting e. g. in the control of any desired function.
  • This armature a is'coupled to the charging circuit of a condenser Cl.
  • Energising the polar relay A by telegraph signals causes the armature a to change-over in a certain rhythm to the other battery pole. Condenser Cl is thus charged and discharged in the same'rhythm, the time taken by the charging and discharging of the condenser Cl being dependent on the resistance value of the resistive element WI.
  • the blocking cell or diode SI is connected across the resistance WI, in such a way that it is not conducting while armature a is in contact with the front contact and is conducting while armature a is in spacing position. In conducting condition cell SI has such a low resistance that the condenser Cl is completely discharged when armature a is in spacing position for the time of one signal element, 1. e.
  • Relay LA then operates, actuating the signalling system.
  • the charging time of condenser CI e. g. the
  • the circuit of Fig. 1 has the disadvantage that, when using a neutral relay, for relay LA, a condenser CI of considerable size is required.
  • This drawback is overcome by the circuit of Fig. 2 using a vacuum or a gas discharge tube BI.
  • the grid of this tube is connected through a protecting resistance W2 to the junction of charging resistance WI and condenser CI.
  • the cathode of tube BI is connected to ground or to a potentiometer. In spacing position of armature a the grid of this tube thus has a high negative voltage with regard to the cathode.
  • the charge on condenser Cl is limited to half battery voltage in the circuit of Fig. 2 by providing cell S2.
  • Tube Bl which'preferably only becomes conducting when the grid voltage is slightly negative cannot get positive grid voltages because of the provision of cell S2. This cell, however, may be omitted.
  • Signalling relay LA attracts when tube Bl becomes conductive, whereby the special signal can now be received.
  • the anode voltage of tube Bl may be derived from the positive half of telegraph battery.
  • Fig. 3 shows the signalling circuit when a cold cathode gas filled tube is used.
  • the anode of this tube B2 is connected through signalling relay LA to the positive pole of telegraph battery.
  • the cathode is connected to the negative pole of the telegraph battery.
  • the grid of this tube is connected through protecting resistance W2 to the junction of resistance Wi and condenser 4 Cl.
  • Condenser Cl should be charged so far after about 110 milliseconds that tube B2 ignites.
  • Signalling relay LA operates on ignition of tube 282.
  • Fig. 1 the time which the signalling relay LA takes to operate is to a high degree independent of the value of battery voltage as long as both battery halves vary in the same manner.
  • the circuits of Figs. 2 and 3 are, however, not independent of voltage fluctuations of tubes if these tubes have a grid swing which is not small compared to battery voltage.
  • a telegraph receiving system comprising a local source of D. C.; a receiving line relay; an armature controlled by said' relay so as to alternate between opposite polarities of said D. C. source; a, condenser having one terminal connected to one pole of said D. C. source; a resistance having terminals connected, respectively, to said armature and to the otherterminal of said condenser; a rectifier connected across said resistance between said armature and the other terminal of said condenser so as to become conductive on said armature making contact with said terminal of said D. C. source connected to said condenser; and signalling means being responsive to the voltage of said condenser surpassing a predetermined limit.
  • a telegraph receiving system comprising a local source of D. C.; a receiving line relay; an armature controlled by said relay so as to alternate between opposite polarities of said D. C. source; a condenser having one terminal connected to one pole of said D. C. source; a resistance having terminals connected, respectively, to said armature and to the other terminal of said condenser; a rectifier connected across said resistance between said armature and the other terminal of said condenser so as to become conductive on said armature making contact with said terminal of said D. C.
  • signalling means being responsive to the voltage of said condenser surpassing a predetermined limit, and including a tube having a cathode, a grid, and an anode, a resistance connecting said grid with that terminal of said condenser which is connected to said armature, and a signalling line connected to said anode.
  • a telegraph receiving system comprising a local source of D. C.; a receiving line relay; an armature controlled by said relay so as to alternate between opposite polarities of said D. C. source; a condenser having one terminal connected to one pole or said D. C. source; a resistance having terminals connected, respectively, to said armature and to the other terminal of said condenser; a rectifier connected across said resistance between said armature and the other terminal of said condenser so as to become conductive on said armature making contact with said terminal of said D. C.
  • signalling means being responsive to the voltage of said condenser surpassing a predetermined limit, and including a tube having a cathode, a rid, and an anode, a resistance connecting said grid with that terminal of said condenser which is connected to said armature, and a signalling line connected to said anode.
  • a telegraph receiving system as claimed in claim 3 including means for biassing said grid of said tube to the predetermined limit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
US767521A 1944-04-24 1947-07-30 Signaling system for telegraph links Expired - Lifetime US2606251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2606251X 1944-04-24

Publications (1)

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US2606251A true US2606251A (en) 1952-08-05

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US767521A Expired - Lifetime US2606251A (en) 1944-04-24 1947-07-30 Signaling system for telegraph links

Country Status (3)

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US (1) US2606251A (enrdf_load_stackoverflow)
BE (1) BE483166A (enrdf_load_stackoverflow)
FR (1) FR959078A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770670A (en) * 1952-05-09 1956-11-13 Bell Telephone Labor Inc Carrier telegraph switchboard supervisory system
US2801283A (en) * 1951-02-22 1957-07-30 British Telecomm Res Ltd Apparatus for converting varying unidirectional voltage into alternating voltage
DE1076173B (de) * 1956-10-16 1960-02-25 Telegrafie & Telefonie Schaltungsanordnung zur UEberwachung einer Telegrafieverbindung auf Empfang besonderer Zeichen
US3119027A (en) * 1960-04-01 1964-01-21 Code A Phone Electronics Inc Signal actuated control circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2094733A (en) * 1933-05-25 1937-10-05 Rca Corp Automatic alarm selector
US2287926A (en) * 1938-03-04 1942-06-30 Rca Corp Signal actuated alarm circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2094733A (en) * 1933-05-25 1937-10-05 Rca Corp Automatic alarm selector
US2287926A (en) * 1938-03-04 1942-06-30 Rca Corp Signal actuated alarm circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801283A (en) * 1951-02-22 1957-07-30 British Telecomm Res Ltd Apparatus for converting varying unidirectional voltage into alternating voltage
US2770670A (en) * 1952-05-09 1956-11-13 Bell Telephone Labor Inc Carrier telegraph switchboard supervisory system
DE1076173B (de) * 1956-10-16 1960-02-25 Telegrafie & Telefonie Schaltungsanordnung zur UEberwachung einer Telegrafieverbindung auf Empfang besonderer Zeichen
US3119027A (en) * 1960-04-01 1964-01-21 Code A Phone Electronics Inc Signal actuated control circuit

Also Published As

Publication number Publication date
BE483166A (enrdf_load_stackoverflow)
FR959078A (enrdf_load_stackoverflow) 1950-03-23

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