DK63281A - Telefonkredsloeb - Google Patents

Telefonkredsloeb

Info

Publication number
DK63281A
DK63281A DK63281A DK63281A DK63281A DK 63281 A DK63281 A DK 63281A DK 63281 A DK63281 A DK 63281A DK 63281 A DK63281 A DK 63281A DK 63281 A DK63281 A DK 63281A
Authority
DK
Denmark
Prior art keywords
telephone circuit
telephone
circuit
Prior art date
Application number
DK63281A
Other languages
English (en)
Inventor
F Melindo
Original Assignee
Cselt Centro Studi Lab Telecom
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 Cselt Centro Studi Lab Telecom filed Critical Cselt Centro Studi Lab Telecom
Publication of DK63281A publication Critical patent/DK63281A/da

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
DK63281A 1980-02-19 1981-02-13 Telefonkredsloeb DK63281A (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT67252/80A IT1128374B (it) 1980-02-19 1980-02-19 Circuito telefonico per la generazione del ritmo di suoneria ed il riconoscimento dello sgancio

Publications (1)

Publication Number Publication Date
DK63281A true DK63281A (da) 1981-08-20

Family

ID=11300855

Family Applications (1)

Application Number Title Priority Date Filing Date
DK63281A DK63281A (da) 1980-02-19 1981-02-13 Telefonkredsloeb

Country Status (8)

Country Link
US (1) US4362908A (da)
EP (1) EP0034339B1 (da)
JP (1) JPS56131246A (da)
BR (1) BR8100796A (da)
CA (1) CA1153838A (da)
DE (1) DE3164041D1 (da)
DK (1) DK63281A (da)
IT (1) IT1128374B (da)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5897949A (ja) * 1981-12-08 1983-06-10 Fujitsu Ltd リングトリップ回路
US4429185A (en) 1981-12-21 1984-01-31 Bell Telephone Laboratories, Incorporated Voltage detector circuit
IT1155661B (it) * 1982-03-24 1987-01-28 Cselt Centro Studi Lab Telecom Circuito elettronico per la rivelazione dello sgancio del microtelefono in presenza della corrente di chiamata
US4455456A (en) * 1982-04-26 1984-06-19 International Telephone And Telegraph Corporation Digital supervisory circuit for a telephone system
US4524245A (en) * 1983-01-13 1985-06-18 Redcom Laboratories Inc. Ring trip detection system
JPS59140572U (ja) * 1983-03-11 1984-09-19 株式会社東芝 リングトリツプ回路
FR2553893B1 (fr) * 1983-10-19 1986-02-07 Texas Instruments France Procede et dispositif de detection d'une transition de la composante continue d'un signal periodique, notamment pour joncteur telephonique
IT1212838B (it) * 1983-11-23 1989-11-30 Ates Componenti Elettron Circuito telefonico, integrabile monoliticamente, per il riconoscimento dello sgancio in fase di suoneria.
US4590331A (en) * 1984-03-13 1986-05-20 Security Systems Internationale, Inc. Hostage negotiation telephone system
CA1240085A (en) * 1984-05-30 1988-08-02 Kenji Takato Calling signal transmission apparatus
IT1213306B (it) * 1986-07-29 1989-12-20 Sgs Microelettronica Spa Circuito telefonico, integrabile monoliticamente, per l'invio disegnali di suoneria in una linea telefonica d'utente e per il riconoscimento dello sgangio in fase di suoneria.
US5001748A (en) * 1989-08-21 1991-03-19 Siemens Transmission Systems, Inc. Ringing signal generator
WO1993011624A1 (en) * 1991-12-02 1993-06-10 Harris Corporation Telephone ringing signal generator
US5406623A (en) * 1993-04-23 1995-04-11 At&T Corp. Method and apparatus for ringing telephone stations

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2014950B2 (de) * 1970-03-28 1976-01-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren und Schaltungsanordnung zur Rufabschaltung in Fernmelde-, insbesondere Fernsprechanlagen
US3720793A (en) * 1971-09-01 1973-03-13 Bell Telephone Labor Inc Supervisory circuit arrangement for telephone subscriber lines
DE2239128A1 (de) * 1972-08-09 1974-02-21 Telefonbau & Normalzeit Gmbh Schaltungsanordnung zur rufabschaltung in fernmeldeanlagen
US3978293A (en) * 1974-11-07 1976-08-31 Bell Telephone Laboratories, Incorporated Ringing control circuitry with shared ringing loop current detector
US3941939A (en) * 1974-11-25 1976-03-02 International Telephone And Telegraph Corporation Electronic ring trip circuit
US4087646A (en) * 1977-01-28 1978-05-02 Bell Telephone Laboratories, Incorporated Dual mode telephone subscriber loop current detector
FR2382818A1 (fr) * 1977-03-04 1978-09-29 Jeumont Schneider Procede de detection rapide du decrochage de postes telephoniques pendant le passage du courant d'appel et installation pour la mise en oeuvre de ce procede
NL7703293A (nl) * 1977-03-28 1978-10-02 Philips Nv Lusdetector voor het detecteren van het slui- ten van een abonneelus tijdens het wekken door middel van snelle polariteitswisselingen.
FR2423096A1 (fr) * 1978-01-17 1979-11-09 Materiel Telephonique Agencement de sonnerie pour joncteur de central telephonique a unite de commande centralisee
US4262172A (en) * 1980-01-17 1981-04-14 Bell Telephone Laboratories, Incorporated Ring-trip detector

Also Published As

Publication number Publication date
IT8067252A0 (it) 1980-02-19
JPS56131246A (en) 1981-10-14
CA1153838A (en) 1983-09-13
EP0034339B1 (en) 1984-06-13
EP0034339A1 (en) 1981-08-26
US4362908A (en) 1982-12-07
BR8100796A (pt) 1981-08-25
IT1128374B (it) 1986-05-28
DE3164041D1 (en) 1984-07-19

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Legal Events

Date Code Title Description
AHB Application shelved due to non-payment