CH216069A - Ringing for carrier frequency limit switching. - Google Patents

Ringing for carrier frequency limit switching.

Info

Publication number
CH216069A
CH216069A CH216069DA CH216069A CH 216069 A CH216069 A CH 216069A CH 216069D A CH216069D A CH 216069DA CH 216069 A CH216069 A CH 216069A
Authority
CH
Switzerland
Prior art keywords
call
carrier frequency
ringing
frequency limit
limit switching
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft C Lorenz
Original Assignee
Lorenz C 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 Lorenz C Ag filed Critical Lorenz C Ag
Publication of CH216069A publication Critical patent/CH216069A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Description

  

      Rufschaltung    für     Trägerfrequenz-Endscha        ,tung.       Der für den normalen Tonfrequenz zwi  schen der     Fernleitung-Endschaltung        und    dem  Fernplatz liegende     Rufumsetzer    muss bei  der     trägerf        requenten        Nachrichtenüb        ermittlung     den trägerfrequent ankommenden     Tonfre-          quenzrLif    in den örtlichen Ruf umsetzen, zum  Beispiel in 20 Hz.  



  Erfindungsgemäss wird vorgeschlagen, in  den leitungsseitigen Eingang dem     Rufum-          setzer    einen Demodulator vorzuschalten.  



  Die beiliegende Abbildung zeigt die bei  spielsweise     Ausführung    der erfindungsge  mässen     Rufschaltung    für die     Trägerfrequenz-          Endschaltung.   <I>a</I> und<I>b</I> ist die     zweiadrige    Lei  tung von der     Trägerfrequenz-Endschaltung     zum Fernplatz.     BU    ist der     Rufumsetzer,    der  20 Hz in 500/20 Hz, das heisst 500 Hz mo  duliert mit 20 Hz, umwandelt und umge  kehrt.

   In den leitungsseitigen Eingang ist  dem     Rufumsetzer        RU    ein     hochohmiger        De-          modulator    D vorgeschaltet.    Der     Rufumset:    per selbst arbeitet dann un  verändert, und de r abgehende     Tonfrequenz-          ruf    gelangt über den     Tiefpass    der     Träger-          frequenz-Endeeini        ichtung    auf die abgehende       Fernleitung.     



  Die     Rufempfai        gsrelais    sind mit     R    und W  bezeichnet, die e     ntsprechenden    Relaiskon  takte mit<I>r</I> und     u.    C sind die     Rufsperrkon-          densatoren.  



      Call switching for carrier frequency end switching. The call converter for the normal audio frequency between the long-distance line end circuit and the remote station must convert the carrier-frequency incoming audio frequency into the local call, for example in 20 Hz, for carrier-frequency message transmission.



  According to the invention, it is proposed that a demodulator be connected upstream of the call converter in the line-side input.



  The accompanying figure shows the example of the execution of the call circuit according to the invention for the carrier frequency end circuit. <I> a </I> and <I> b </I> is the two-wire line from the carrier frequency end circuit to the remote station. BU is the call converter, which converts 20 Hz into 500/20 Hz, i.e. 500 Hz modulates with 20 Hz, and vice versa.

   A high-resistance demodulator D is connected upstream of the call converter RU in the line-side input. The call conversion: by itself then works unchanged, and the outgoing audio frequency call reaches the outgoing trunk line via the low-pass filter of the carrier frequency termination device.



  The Rufempfai gsrelais are designated with R and W, the corresponding relay contacts with <I> r </I> and u. C are the call blocking capacitors.

Claims (1)

PATEFTANSPRUCH Rufschaltung für Trägerfrequenz-End- schaltung, dadurcl i gekennzeichnet, dass in den leitungsseitige i Eingang des den Ton frequenzruf in ör, lichen Rufumwandelnden Rufumsetzers ein _ )emodulator vorgeschaltet ist, um den trägerfrequent ankommenden Tonfrequenzruf in den örtlichen Ruf umzu- setzen. PATEFT CLAIM Call circuit for carrier frequency end circuit, characterized by the fact that a _) emodulator is connected upstream of the line-side input of the call converter which converts the tone frequency call into a local call.
CH216069D 1939-12-08 1940-11-04 Ringing for carrier frequency limit switching. CH216069A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE216069X 1939-12-08

Publications (1)

Publication Number Publication Date
CH216069A true CH216069A (en) 1941-07-31

Family

ID=5827284

Family Applications (1)

Application Number Title Priority Date Filing Date
CH216069D CH216069A (en) 1939-12-08 1940-11-04 Ringing for carrier frequency limit switching.

Country Status (2)

Country Link
BE (1) BE439749A (en)
CH (1) CH216069A (en)

Also Published As

Publication number Publication date
BE439749A (en)

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