FR2301982A1 - Circuit detecteur des changements d'etat d'une ligne telephonique - Google Patents

Circuit detecteur des changements d'etat d'une ligne telephonique

Info

Publication number
FR2301982A1
FR2301982A1 FR7604734A FR7604734A FR2301982A1 FR 2301982 A1 FR2301982 A1 FR 2301982A1 FR 7604734 A FR7604734 A FR 7604734A FR 7604734 A FR7604734 A FR 7604734A FR 2301982 A1 FR2301982 A1 FR 2301982A1
Authority
FR
France
Prior art keywords
telephone line
state change
detector circuit
change detector
circuit
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.)
Withdrawn
Application number
FR7604734A
Other languages
English (en)
French (fr)
Inventor
Ryszard Kitajewski
Anthony William Sweet
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of FR2301982A1 publication Critical patent/FR2301982A1/fr
Withdrawn legal-status Critical Current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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Control Of Eletrric Generators (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
FR7604734A 1975-02-20 1976-02-20 Circuit detecteur des changements d'etat d'une ligne telephonique Withdrawn FR2301982A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB715875A GB1478219A (en) 1975-02-20 1975-02-20 Telecommunication exchange circuits

Publications (1)

Publication Number Publication Date
FR2301982A1 true FR2301982A1 (fr) 1976-09-17

Family

ID=9827726

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7604734A Withdrawn FR2301982A1 (fr) 1975-02-20 1976-02-20 Circuit detecteur des changements d'etat d'une ligne telephonique

Country Status (7)

Country Link
BE (1) BE838697A (no)
BR (1) BR7507715A (no)
ES (1) ES445388A1 (no)
FR (1) FR2301982A1 (no)
GB (1) GB1478219A (no)
IT (1) IT1055300B (no)
NO (1) NO144404C (no)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423044A1 (fr) * 1978-01-20 1979-11-09 Hitachi Ltd Circuit d'annulation de champ magnetique a courant continu
WO1992000643A1 (en) * 1990-06-26 1992-01-09 Northern Telecom Limited Line interface circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146872B (en) * 1983-09-15 1986-11-05 Stc Plc Hall effect module for loop detector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1158584B (de) * 1962-08-16 1963-12-05 Telefunken Patent Schaltungsanordnung zur Pruefung des Anruf- und Belegungszustandes der Teilnehmerleitungen in Fernmelde-, insbesondere Fernsprechvermittlungsanlagen mit Hilfe von Hall-Generatoren
US3848094A (en) * 1972-12-29 1974-11-12 Stromberg Carlson Corp Telephone battery feed circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1158584B (de) * 1962-08-16 1963-12-05 Telefunken Patent Schaltungsanordnung zur Pruefung des Anruf- und Belegungszustandes der Teilnehmerleitungen in Fernmelde-, insbesondere Fernsprechvermittlungsanlagen mit Hilfe von Hall-Generatoren
US3848094A (en) * 1972-12-29 1974-11-12 Stromberg Carlson Corp Telephone battery feed circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423044A1 (fr) * 1978-01-20 1979-11-09 Hitachi Ltd Circuit d'annulation de champ magnetique a courant continu
WO1992000643A1 (en) * 1990-06-26 1992-01-09 Northern Telecom Limited Line interface circuit

Also Published As

Publication number Publication date
ES445388A1 (es) 1977-06-16
IT1055300B (it) 1981-12-21
NO144404B (no) 1981-05-11
NO760488L (no) 1976-09-01
BR7507715A (pt) 1976-08-24
NO144404C (no) 1981-08-19
GB1478219A (en) 1977-06-29
BE838697A (fr) 1976-08-19

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Legal Events

Date Code Title Description
ST Notification of lapse