FR2379206A1 - Detecteur de courants de boucle pour installation telephonique - Google Patents

Detecteur de courants de boucle pour installation telephonique

Info

Publication number
FR2379206A1
FR2379206A1 FR7802377A FR7802377A FR2379206A1 FR 2379206 A1 FR2379206 A1 FR 2379206A1 FR 7802377 A FR7802377 A FR 7802377A FR 7802377 A FR7802377 A FR 7802377A FR 2379206 A1 FR2379206 A1 FR 2379206A1
Authority
FR
France
Prior art keywords
current detector
loop current
telephone installation
stages
pulses
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
FR7802377A
Other languages
English (en)
Other versions
FR2379206B1 (fr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of FR2379206A1 publication Critical patent/FR2379206A1/fr
Application granted granted Critical
Publication of FR2379206B1 publication Critical patent/FR2379206B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
    • 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)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)

Abstract

L'invention concerne les installations téléphoniques. Un détecteur de courants de boucle comprend deux étages 40 et 50, et un circuit de retard R8, C1 est branché entre ces deux étages de façon à assurer une protection contre les impulsions parasites et les impulsions de numérotation dédoublées par des signaux transitoires. Application aux boucles d'abonnés associées à un système de transmission en multiplex.
FR7802377A 1977-01-28 1978-01-27 Detecteur de courants de boucle pour installation telephonique Granted FR2379206A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/763,288 US4087646A (en) 1977-01-28 1977-01-28 Dual mode telephone subscriber loop current detector

Publications (2)

Publication Number Publication Date
FR2379206A1 true FR2379206A1 (fr) 1978-08-25
FR2379206B1 FR2379206B1 (fr) 1982-11-19

Family

ID=25067400

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7802377A Granted FR2379206A1 (fr) 1977-01-28 1978-01-27 Detecteur de courants de boucle pour installation telephonique

Country Status (8)

Country Link
US (1) US4087646A (fr)
JP (1) JPS5395509A (fr)
CA (1) CA1090928A (fr)
DE (1) DE2803282C2 (fr)
FR (1) FR2379206A1 (fr)
GB (1) GB1567721A (fr)
IT (1) IT1092318B (fr)
NL (1) NL7800795A (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1159706B (it) * 1978-06-02 1987-03-04 Cselt Centro Studi Lab Telecom Circuito telefonico elettronico di linea d'utente
JPS5521651A (en) * 1978-08-02 1980-02-15 Nec Corp Ring trip circuit
DE2850929C2 (de) * 1978-11-24 1982-06-09 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Unterdrückung von Störspannungseinflüssen bei der Bewertung des Signalzustandes auf Übertragungsleitungen, insbesondere auf Teilnehmeranschlußleitungen in Fernsprechanlagen
NL7903665A (nl) * 1979-05-10 1980-11-12 Philips Nv Aansluitschakeling voor een telefoonlijn.
JPS55158797A (en) * 1979-05-28 1980-12-10 Iwatsu Electric Co Ltd Line circuit
DE2938998C2 (de) * 1979-09-26 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung für eine die Schaltzustände einer Übertragungsleitung, insbesondere einer Teilnehmeranschlußleitung registrierenden Indikatorschaltung in Fernsprechvermittlungsanlagen
US4304970A (en) * 1979-11-14 1981-12-08 Gte Products Corp. Telephone status monitor apparatus
GB2066023B (en) * 1979-12-13 1983-11-09 Standard Telephones Cables Ltd Telephone line interface
IT1128374B (it) * 1980-02-19 1986-05-28 Cselt Centro Studi Lab Telecom Circuito telefonico per la generazione del ritmo di suoneria ed il riconoscimento dello sgancio
US4323734A (en) * 1980-05-15 1982-04-06 Crest Industries, Inc. Interface circuit for telephone line to equipment signal coupling
US4323735A (en) * 1980-09-26 1982-04-06 Bell Telephone Laboratories, Inc. Key telephone line shunt detector circuit
FR2501940B1 (fr) * 1981-03-11 1985-07-19 Trt Telecom Radio Electr Detecteur de boucle peu sensible aux tensions longitudinales
US4782520A (en) * 1981-08-06 1988-11-01 Telco Systems, Inc. Pulse receiver circuit providing longitudinal balance
US4455456A (en) * 1982-04-26 1984-06-19 International Telephone And Telegraph Corporation Digital supervisory circuit for a telephone system
US4473719A (en) * 1982-05-17 1984-09-25 At&T Bell Laboratories Switchhook status detector
US4524246A (en) * 1982-07-07 1985-06-18 Harris Corporation SLIC II--common-mode current rejection
US4581691A (en) * 1984-04-23 1986-04-08 At&T Bell Laboratories Balanced constant current sensing circuit inherently immune to longitudinal currents
US5111502A (en) * 1990-04-25 1992-05-05 Command Communications, Inc. Telephone line bridging sensor
US6960984B1 (en) * 1999-12-08 2005-11-01 University Of North Carolina Methods and systems for reactively compensating magnetic current loops
WO2006020187A2 (fr) * 2004-07-16 2006-02-23 The University Of North Carolina At Chapel Hill Procedes, systemes et progiciels de projection en spectre continu
ES2823456T3 (es) 2009-06-25 2021-05-07 Univ North Carolina Chapel Hill Método y sistema para utilizar postes unidos a una superficie accionados para evaluar la reología de fluidos biológicos

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230045A1 (de) * 1972-06-20 1974-04-11 Siemens Ag Schaltungsanordnung zum anrufen von teilnehmerstationen in fernsprechanlagen
FR2324181A1 (fr) * 1975-09-12 1977-04-08 Lannionnais Electronique Dispositif de detection de boucle d'une ligne d'abonne

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205312A (en) * 1960-12-23 1965-09-07 Gen Dynamics Corp Off-hook detector
US3935392A (en) * 1974-01-17 1976-01-27 Smith Lloyd M Dial pulse detection method and apparatus
US3899644A (en) * 1974-06-19 1975-08-12 Data Time AC/DC-monitoring telephone line ringing voltage detector
US3963869A (en) * 1974-12-02 1976-06-15 Bell Telephone Laboratories, Incorporated Parity framing of pulse systems
JPS5185306A (en) * 1975-01-23 1976-07-26 Nippon Electric Co Jidodenwakokankino shingokenshutsukairo
DE2520975C3 (de) * 1975-05-10 1980-06-12 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zum Erfassen von Schleifenzuständen in Fernsprechanlagen
DE2520974B2 (de) * 1975-05-10 1980-04-03 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zur Überwachung einer Teilnehmerschleife in Fernsprechanlagen
JPS51134506A (en) * 1975-05-16 1976-11-22 Nec Corp Subscriber's circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2230045A1 (de) * 1972-06-20 1974-04-11 Siemens Ag Schaltungsanordnung zum anrufen von teilnehmerstationen in fernsprechanlagen
FR2324181A1 (fr) * 1975-09-12 1977-04-08 Lannionnais Electronique Dispositif de detection de boucle d'une ligne d'abonne

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NV418/71 *
NV8027/69 *

Also Published As

Publication number Publication date
JPS5395509A (en) 1978-08-21
NL7800795A (nl) 1978-08-01
IT7819609A0 (it) 1978-01-25
GB1567721A (en) 1980-05-21
JPS576316B2 (fr) 1982-02-04
FR2379206B1 (fr) 1982-11-19
IT1092318B (it) 1985-07-06
DE2803282C2 (de) 1982-06-03
US4087646A (en) 1978-05-02
CA1090928A (fr) 1980-12-02
DE2803282A1 (de) 1978-08-03

Similar Documents

Publication Publication Date Title
FR2379206A1 (fr) Detecteur de courants de boucle pour installation telephonique
SE7714316L (sv) Kopplingsanordning for skydd av telefonledningar
FR2353188A1 (fr) Systeme de raccordement a un reseau telephonique d'un equipement de communication accessoire
AU544171B2 (en) Subscriber telephone set provided with protection devices against overvoltages
BE871163A (fr) Autocommutateur pour un systeme de telecommunication
FR2341974A1 (fr) Dispositif de protection de lignes basse tension, notamment pour reseau telephonique
CA1016613A (en) Protective diode network for mos devices
BE858001A (fr) Disposition de circuit pour un systeme telephonique d'interphone
NL7806549A (nl) Telefoonaanpassingsinrichting.
FR2401583A1 (fr) Installation numerique de telecommunications a multiplexage par repartition dans le temps, notamment installation de telephonie pcm, comportant des dispositifs a champ de couplage, prevus en double
FR2526251B1 (fr) Dispositif de multiplexage numerique, notamment pour reseau telephonique numerique
BE867157A (fr) Dispositif d'emission de multiplets partiels pour systemes de communications numeriques
JPS5373005A (en) Automatic channel converting system for automatic call answering device
DK452883A (da) System til dataoverfoering over det offentlige telefonnet
JPS5399702A (en) Call signal detector circuit
NL7806031A (nl) Overspanningsafleiderinrichting voor aansluitlijsten voor de telecommunicatietechniek.
NL7809721A (nl) Ontvanger voor telefoon- kostentelimpulsen.
FR2598874B1 (fr) Dispositif de protection hygienique pour combine telephonique
FR2326818A1 (fr) Systeme de transmission telephonique, multiplexeur et demultiplexeur pour la mise en oeuvre d'un tel systeme
IT1099713B (it) Ricevitore secondario per apparecchi telefonici
GB2007598B (en) Protection of seabed installations
SU646463A1 (ru) Разделительное устройство телефонных линий
JPS53116023A (en) Facsimile communication system for private branch
JPS53114306A (en) Inter-office call-back system
JPS53146521A (en) Facsimile communication system

Legal Events

Date Code Title Description
ST Notification of lapse