IT1062379B - Dispositivo di protezione per apparecchi telefonici di abbonato - Google Patents

Dispositivo di protezione per apparecchi telefonici di abbonato

Info

Publication number
IT1062379B
IT1062379B IT68578/76A IT6857876A IT1062379B IT 1062379 B IT1062379 B IT 1062379B IT 68578/76 A IT68578/76 A IT 68578/76A IT 6857876 A IT6857876 A IT 6857876A IT 1062379 B IT1062379 B IT 1062379B
Authority
IT
Italy
Prior art keywords
subscription
protection device
telephone equipment
telephone
equipment
Prior art date
Application number
IT68578/76A
Other languages
English (en)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of IT1062379B publication Critical patent/IT1062379B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Protection Of Static Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
IT68578/76A 1975-06-30 1976-06-25 Dispositivo di protezione per apparecchi telefonici di abbonato IT1062379B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7507731,A NL174420C (nl) 1975-06-30 1975-06-30 Beveiligingsinrichting voor een telefoontoestel.

Publications (1)

Publication Number Publication Date
IT1062379B true IT1062379B (it) 1984-10-10

Family

ID=19824045

Family Applications (1)

Application Number Title Priority Date Filing Date
IT68578/76A IT1062379B (it) 1975-06-30 1976-06-25 Dispositivo di protezione per apparecchi telefonici di abbonato

Country Status (9)

Country Link
US (1) US4079211A (it)
JP (1) JPS526003A (it)
BE (1) BE843514A (it)
DE (1) DE2627199C2 (it)
FR (1) FR2316812A1 (it)
GB (1) GB1514662A (it)
IT (1) IT1062379B (it)
NL (1) NL174420C (it)
SE (1) SE403234B (it)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE410695B (sv) * 1976-12-22 1979-10-22 Gullfiber Ab Horselskydd med hortelefoner
GB2064268B (en) * 1979-09-17 1983-10-26 Philips Nv Electronic signalling device for connection to a signal transmission line
US4264787A (en) * 1979-12-31 1981-04-28 Akzona Incorporated Hazardous voltage protection circuit
NL8001136A (nl) * 1980-02-26 1981-09-16 Philips Nv Schakeling voor toepassing in een telefoontoestel.
JPS60107995A (ja) * 1983-11-16 1985-06-13 Oki Electric Ind Co Ltd 通話路直流ル−プ回路
FR2556909B1 (fr) * 1983-12-14 1986-04-18 Radiotechnique Compelec Dispositif d'interface pour un poste telephonique
JPS6122717A (ja) * 1984-07-06 1986-01-31 富士通株式会社 過電流保護回路
DE3541974A1 (de) * 1985-11-28 1987-06-04 Danfoss As Schutzschaltung fuer die induktionsspule eines magnetisch-induktiven durchflussmessers
AU601737B2 (en) * 1986-04-30 1990-09-20 Alcatel Australia Limited Telephone protection circuit
EP0306483A4 (en) * 1986-04-30 1989-07-11 Alcatel Australia PROTECTIVE CIRCUIT FOR TELEPHONES.
US4941063A (en) * 1988-03-04 1990-07-10 Oneac Corporation Telephone lines overvoltage protection apparatus
US4944015A (en) * 1988-04-29 1990-07-24 Juve Ronald A Audio compression circuit for television audio signals
US4870530A (en) * 1988-06-27 1989-09-26 Advanced Micro Devices, Inc. Electrostatic discharge protection circuitry for any two external pins of an I.C. package
AU634187B2 (en) * 1988-12-12 1993-02-18 Alcatel Australia Limited A protection circuit
WO1990007213A1 (en) * 1988-12-12 1990-06-28 Standard Telephones And Cables Pty. Limited A protection circuit
US4849846A (en) * 1988-12-16 1989-07-18 Northern Telecom Limited Telephone protection circuit
US5212617A (en) * 1989-12-29 1993-05-18 Robert Bosch Gmbh Circuit for compensating very fast current fluctuations
US5369711A (en) * 1990-08-31 1994-11-29 Bellsouth Corporation Automatic gain control for a headset
US5371803A (en) * 1990-08-31 1994-12-06 Bellsouth Corporation Tone reduction circuit for headsets
GB9021222D0 (en) * 1990-09-28 1990-11-14 Raychem Ltd Circuit protection device
US5493469A (en) * 1991-01-18 1996-02-20 Mildred A. Lace Surge protection for data lines
CA2095500C (en) * 1992-06-08 1997-09-23 Dimitris Jim Pelegris Telephone line overvoltage protection method and apparatus
JP3283964B2 (ja) * 1992-06-09 2002-05-20 ロックウェル・インターナショナル・コーポレイション モデムサージ保護回路およびサージ保護方法
US5369666A (en) * 1992-06-09 1994-11-29 Rockwell International Corporation Modem with digital isolation
JPH06334775A (ja) * 1993-05-19 1994-12-02 Canon Inc 網制御装置
US5315651A (en) * 1993-06-09 1994-05-24 Rockwell International Corporation Active surge rejection circuit
US5701352A (en) * 1994-07-14 1997-12-23 Bellsouth Corporation Tone suppression automatic gain control for a headset
US5905623A (en) * 1997-05-27 1999-05-18 Oneac Corporation Telephone and data overvoltage protection apparatus including a longitudinal transformer
US6671144B1 (en) 2000-06-26 2003-12-30 Premier Aviation, Inc. Method and apparatus for detecting ground faults and for isolating power supply from the ground faults
CA2414273C (en) * 2000-06-26 2012-04-10 Premier Aviation, Inc. Method and apparatus for detecting electrical faults and isolating power source from the electrical faults
US8451576B2 (en) * 2008-05-30 2013-05-28 Littelfuse, Inc. SCR circuit for protecting central office end of telephone line
US20090296300A1 (en) * 2008-05-30 2009-12-03 Casey Kelly C SCR circuit for protecting customer end of telephone line

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1288100A (fr) * 1961-02-06 1962-03-24 Thomson Houston Comp Francaise Perfectionnements aux stabilisateurs de tension
US3359434A (en) * 1965-04-06 1967-12-19 Control Data Corp Silicon controlled rectifier arrangement for improved shortcircuit protection
US3558830A (en) * 1969-04-09 1971-01-26 Communication Technology Inc Overvoltage transmission line protector
DE2058891B1 (de) * 1970-11-30 1972-05-25 Siemens Ag Schaltungsanordnung zum Schutz gegen UEberlastung fuer die Transistoren einer Leistungsendstufe
CA930488A (en) * 1971-08-27 1973-07-17 C. J. Cowpland Michael Power supply
JPS531123B2 (it) * 1973-12-28 1978-01-14
CA1032221A (en) * 1974-06-14 1978-05-30 Mitel Canada Limited Telephone line impedance regulator

Also Published As

Publication number Publication date
FR2316812A1 (fr) 1977-01-28
US4079211A (en) 1978-03-14
DE2627199A1 (de) 1977-02-03
FR2316812B1 (it) 1982-08-13
NL174420B (nl) 1984-01-02
NL7507731A (nl) 1977-01-03
BE843514A (fr) 1976-12-28
NL174420C (nl) 1984-06-01
SE403234B (sv) 1978-07-31
DE2627199C2 (de) 1983-01-20
SE7607333L (sv) 1976-12-31
JPS526003A (en) 1977-01-18
GB1514662A (en) 1978-06-21

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