AT67954B - Circuit arrangement of a telephone system with a secret line. - Google Patents

Circuit arrangement of a telephone system with a secret line.

Info

Publication number
AT67954B
AT67954B AT67954DA AT67954B AT 67954 B AT67954 B AT 67954B AT 67954D A AT67954D A AT 67954DA AT 67954 B AT67954 B AT 67954B
Authority
AT
Austria
Prior art keywords
line
circuit arrangement
secret
telephone system
circuit
Prior art date
Application number
Other languages
German (de)
Original Assignee
Siemens Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Ag filed Critical Siemens Ag
Application granted granted Critical
Publication of AT67954B publication Critical patent/AT67954B/en

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Description

  

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 angezogen und die Leitung c abgetrennt, so dass bei bestzter Geheimleitung der Anschaltstromkreis des Relais. R irgend eines anderen Teilnehmers beim Drücken der Geheimtaste stromlos bleibt. Daher kann der Kontakt 16 keine Verbindung des Stations- bzw. Sprechstromkreises mit der Geheimleitung herstellen. Vielmehr wird das Telephon beim Abheben des Hörers und   Drücken   der Geheimtaste in einem solchen Falle durch den Kontakt 16 kurzgeschlossen. Ein   Belauschen eines über   die   Geheimleitung geführten Gespräches   ist auf diese Weise ausgeschlossen. 



    Zweckmässig kann beim   Anzug des   Ankers 13   durch das Relais tr ein die Besetztzeichen k aller Teilnehmer enthaltender Stromkreis angeschlossen werden, indem der Anker 1-3 sich an einen   Kontakt   22 einer Leitung i anlegt. 



   Werden nun-die Hörer angehängt und dadurch die Geheimtasten ausgelöst, so werden die Stromkreise der Anschaltrelais R stromlos und die Geheimleitung wieder frei. Dabei sind Geheimtaste und Sperrtaste derart in mechanischer Abhängigkeit voneinander, dass die Sperrtaste nur nach Bedienen der Geheimtaste zur Wirkung gebracht und mit dieser gleichzeitig bei Anhängen des Hörers ausgelöst werden kann. 



    PEATENT-ANSPRÜCHE:  
1. Schaltungsanordnung einer Fernsprechanlage mit Gebeimleitung, auf der zwischen zwei Sprechstellen der Anlage unabhängig vom Liniennetz   Gespräche gefuhrt   werden können, dadurch gekennzeichnet, dass der gleichzeitige Anschluss zweier beliebiger, über eine   Netzleitung   
 EMI2.2 
 schluss durch ein die gemeinsame   Rückleitung   (c) der Anschaltstromkreise abschaltendes Trennrelais (tr) bewirkt wird, dessen Erregung durch einen von einer Sperrtaste (11) geschlossenen Stromkreis (B, tr, 12, 11, 21, 1, h, B) stattfindet.



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 attracted and the line c disconnected, so that when the secret line is engaged, the switch-on circuit of the relay. R any other participant remains de-energized when the secret key is pressed. Therefore, the contact 16 cannot establish a connection of the station or speech circuit with the secret line. Rather, the telephone is short-circuited by the contact 16 when the receiver is lifted and the secret key is pressed in such a case. In this way, eavesdropping on a conversation conducted via the secret line is excluded.



    When the armature 13 is attracted, a circuit containing the busy signals k of all subscribers can be connected by the relay tr, in that the armature 1-3 comes into contact with a contact 22 of a line i.



   If the receiver is now attached and the secret keys are triggered, the circuits of the connection relay R are de-energized and the secret line is free again. The secret key and lock key are mechanically dependent on one another in such a way that the lock key can only be activated after the secret key has been operated and can be triggered with this at the same time when the receiver is attached.



    PEATENT CLAIMS:
1. Circuit arrangement of a telephone system with Gebeimleitung, on which calls can be made between two intercom stations of the system independently of the line network, characterized in that the simultaneous connection of any two via a power line
 EMI2.2
 circuit is brought about by an isolating relay (tr) which switches off the common return line (c) of the connection circuits, the excitation of which takes place via a circuit (B, tr, 12, 11, 21, 1, h, B) closed by a lock button (11).

Claims (1)

2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die eine Anschlussleitung (15) der einzelnen Sprechstellen (t, t') an die Geheimleitung (g1, g2) im ruhezustande EMI2.3 10, 10', e, B) einschaltet. 2. Circuit arrangement according to claim 1, characterized in that the one connection line (15) of the individual speech stations (t, t ') to the secret line (g1, g2) in the idle state EMI2.3 10, 10 ', e, B) switches on. 3. Schaltungsanordnung nach Anspruch l und 2, dadurch gekennzeichnet, dass der Sprech- stromkreis der von der Geheimleitun (g1, g2) abgeschalteten Sprechstellen bei gedrückter Taste (T) EMI2.4 zum Zwecke, ein Belauschen eines über die Leitung (g1, g2) geführten Gespräches auch in dieser t Tastenstellung zu verhindern. 3. Circuit arrangement according to claim l and 2, characterized in that the speech circuit of the speech stations switched off by the secret line (g1, g2) when the key (T) is pressed EMI2.4 for the purpose of preventing eavesdropping on a call being made via the line (g1, g2) even in this t key position.
AT67954D 1912-06-06 1913-05-30 Circuit arrangement of a telephone system with a secret line. AT67954B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE67954X 1912-06-06

Publications (1)

Publication Number Publication Date
AT67954B true AT67954B (en) 1915-02-10

Family

ID=5634179

Family Applications (1)

Application Number Title Priority Date Filing Date
AT67954D AT67954B (en) 1912-06-06 1913-05-30 Circuit arrangement of a telephone system with a secret line.

Country Status (1)

Country Link
AT (1) AT67954B (en)

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