NL7800795A - Detector voor telefoonlusstromen. - Google Patents

Detector voor telefoonlusstromen.

Info

Publication number
NL7800795A
NL7800795A NL7800795A NL7800795A NL7800795A NL 7800795 A NL7800795 A NL 7800795A NL 7800795 A NL7800795 A NL 7800795A NL 7800795 A NL7800795 A NL 7800795A NL 7800795 A NL7800795 A NL 7800795A
Authority
NL
Netherlands
Prior art keywords
detector
telephone loop
loop flows
flows
telephone
Prior art date
Application number
NL7800795A
Other languages
English (en)
Original Assignee
Western Electric Co
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 filed Critical Western Electric Co
Publication of NL7800795A publication Critical patent/NL7800795A/nl

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)
NL7800795A 1977-01-28 1978-01-23 Detector voor telefoonlusstromen. NL7800795A (nl)

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 (1)

Publication Number Publication Date
NL7800795A true NL7800795A (nl) 1978-08-01

Family

ID=25067400

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7800795A NL7800795A (nl) 1977-01-28 1978-01-23 Detector voor telefoonlusstromen.

Country Status (8)

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

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 (en) * 2004-07-16 2006-02-23 The University Of North Carolina At Chapel Hill Methods, systems and computer program products for full spectrum projection
EP2446259B1 (en) 2009-06-25 2020-08-05 The University of North Carolina At Chapel Hill Method and system for using actuated surface-attached posts for assessing biofluid rheology

Family Cites Families (10)

* 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
DE2230045B2 (de) * 1972-06-20 1978-08-31 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung zum Anrufen von Teilnehmerstationen in Fernsprechanlagen
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
DE2520974B2 (de) * 1975-05-10 1980-04-03 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zur Überwachung einer Teilnehmerschleife in Fernsprechanlagen
DE2520975C3 (de) * 1975-05-10 1980-06-12 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Schaltungsanordnung zum Erfassen von Schleifenzuständen in Fernsprechanlagen
JPS51134506A (en) * 1975-05-16 1976-11-22 Nec Corp Subscriber's circuit
FR2324181A1 (fr) * 1975-09-12 1977-04-08 Lannionnais Electronique Dispositif de detection de boucle d'une ligne d'abonne

Also Published As

Publication number Publication date
JPS576316B2 (nl) 1982-02-04
FR2379206B1 (nl) 1982-11-19
DE2803282A1 (de) 1978-08-03
GB1567721A (en) 1980-05-21
IT1092318B (it) 1985-07-06
CA1090928A (en) 1980-12-02
US4087646A (en) 1978-05-02
DE2803282C2 (de) 1982-06-03
FR2379206A1 (fr) 1978-08-25
IT7819609A0 (it) 1978-01-25
JPS5395509A (en) 1978-08-21

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Legal Events

Date Code Title Description
BA A request for search or an international-type search has been filed
BB A search report has been drawn up
A85 Still pending on 85-01-01
BV The patent application has lapsed