CA988230A - Dc/ac discriminating and dc detection arrangement - Google Patents

Dc/ac discriminating and dc detection arrangement

Info

Publication number
CA988230A
CA988230A CA191,398A CA191398A CA988230A CA 988230 A CA988230 A CA 988230A CA 191398 A CA191398 A CA 191398A CA 988230 A CA988230 A CA 988230A
Authority
CA
Canada
Prior art keywords
discriminating
detection arrangement
arrangement
detection
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.)
Expired
Application number
CA191,398A
Other languages
English (en)
Other versions
CA191398S (en
Inventor
Frans C.L. De Wit
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.)
ITT Canada Ltd
Original Assignee
ITT Canada Ltd
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 ITT Canada Ltd filed Critical ITT Canada Ltd
Application granted granted Critical
Publication of CA988230A publication Critical patent/CA988230A/en
Expired legal-status Critical Current

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)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
CA191,398A 1973-02-01 1974-01-31 Dc/ac discriminating and dc detection arrangement Expired CA988230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7301486A NL7301486A (xx) 1973-02-01 1973-02-01

Publications (1)

Publication Number Publication Date
CA988230A true CA988230A (en) 1976-04-27

Family

ID=19818133

Family Applications (1)

Application Number Title Priority Date Filing Date
CA191,398A Expired CA988230A (en) 1973-02-01 1974-01-31 Dc/ac discriminating and dc detection arrangement

Country Status (8)

Country Link
US (1) US3903375A (xx)
BE (1) BE810412A (xx)
CA (1) CA988230A (xx)
CH (1) CH583491A5 (xx)
FR (1) FR2216731B1 (xx)
GB (1) GB1450743A (xx)
IT (1) IT1006205B (xx)
NL (1) NL7301486A (xx)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1479094A (en) * 1975-03-25 1977-07-06 Standard Telephones Cables Ltd Ring trip detectors
GB1529452A (en) * 1975-04-10 1978-10-18 Ansafone Ltd Detection of direct currents or voltages
FR2390065A1 (en) * 1977-05-03 1978-12-01 Constr Telephoniques Monitor for telephonic loop current detector logic state - uses transformer coupling to reference voltage and interrogation pulse source
US4104488A (en) * 1977-05-19 1978-08-01 International Standard Electric Corporation Subscriber line circuit
ES244069Y (es) * 1979-06-21 1980-04-01 Circuito detector de corriente.
GB2146872B (en) * 1983-09-15 1986-11-05 Stc Plc Hall effect module for loop detector
US4633040A (en) * 1984-10-25 1986-12-30 Candela Electronics, Inc. Personal branch exchange system
US5526420A (en) * 1990-08-03 1996-06-11 Canon Kabushiki Kaisha Communication apparatus
US5327016A (en) * 1992-04-06 1994-07-05 Motorola, Inc. Load control circuit including automatic AC/DC discernment
US5777836A (en) * 1994-04-01 1998-07-07 U.S. Robotics Mobile Communications Corp. Line current protection circuit and method for use with a PCMCIA-architecture modem card
US5532898A (en) * 1994-04-01 1996-07-02 Megahertz Corporation Line current protection circuit for use with a PCMCIA-architecture modem card
US6310953B1 (en) * 1997-07-24 2001-10-30 Fujitsu Limited Subscriber circuit
US6351533B1 (en) 1998-01-26 2002-02-26 Xircom, Inc. System and method for protecting devices connected to a telephone line
US6088446A (en) * 1998-05-06 2000-07-11 Actiontec Electronics, Inc. Protection circuit for use with a telephone appliance and methods of use
US6188764B1 (en) 1998-05-27 2001-02-13 Actiontec Electronics, Inc. Over-voltage protection circuit for use with a telephone appliance
US6115469A (en) * 1998-08-25 2000-09-05 Unitrode Corporation Telephone line ring signal and DC power generator
US6778664B1 (en) 2000-03-14 2004-08-17 3Com Corporation Line current protection circuit and method for linear and nonlinear hold circuit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB950225A (en) * 1961-09-04 1964-02-19 Ass Elect Ind Improvements relating to telephone exchange system ringtripping arrangements and to like direct current responsive arrangements adapted to discriminate against alternating current
FR1312468A (fr) * 1961-10-02 1962-12-21 équipement de ligne d'abonné pour systèmes de commutation téléphonique du type électronique
FR1384618A (fr) * 1963-08-02 1965-01-08 Explorateur de lignes téléphoniques à éléments magnétorésistants
FR2116815A5 (xx) * 1970-12-08 1972-07-21 Ericsson Telefon Ab L M
US3766325A (en) * 1971-09-13 1973-10-16 Lordel Mfg Co Control circuits for key telephone system
BE791415A (fr) * 1971-11-17 1973-05-16 Int Standard Electric Corp Circuit d'arret de sonnerie
US3764752A (en) * 1972-01-11 1973-10-09 Teltronics Inc Telephone line card system
US3746798A (en) * 1972-05-23 1973-07-17 Gte Automatic Electric Lab Inc Electronic ring trip circuit
US3829619A (en) * 1972-12-29 1974-08-13 Stromberg Carlson Corp Telephone ring trip circuit

Also Published As

Publication number Publication date
FR2216731A1 (xx) 1974-08-30
AU6509974A (en) 1975-08-07
NL7301486A (xx) 1974-08-05
GB1450743A (en) 1976-09-29
FR2216731B1 (xx) 1977-09-16
BE810412A (nl) 1974-07-31
CH583491A5 (xx) 1976-12-31
IT1006205B (it) 1976-09-30
US3903375A (en) 1975-09-02

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