FR2379206A1 - Detecteur de courants de boucle pour installation telephonique - Google Patents
Detecteur de courants de boucle pour installation telephoniqueInfo
- 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
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.
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)
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)
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)
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 |
-
1977
- 1977-01-28 US US05/763,288 patent/US4087646A/en not_active Expired - Lifetime
- 1977-11-24 CA CA291,633A patent/CA1090928A/fr not_active Expired
-
1978
- 1978-01-23 NL NL7800795A patent/NL7800795A/xx not_active Application Discontinuation
- 1978-01-24 JP JP589078A patent/JPS5395509A/ja active Granted
- 1978-01-25 IT IT19609/78A patent/IT1092318B/it active
- 1978-01-26 DE DE2803282A patent/DE2803282C2/de not_active Expired
- 1978-01-27 FR FR7802377A patent/FR2379206A1/fr active Granted
- 1978-01-27 GB GB3345/78A patent/GB1567721A/en not_active Expired
Patent Citations (2)
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)
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 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |