GB2091521B - Telephone subscriber's line circuit with overvoltage protection - Google Patents

Telephone subscriber's line circuit with overvoltage protection

Info

Publication number
GB2091521B
GB2091521B GB8201110A GB8201110A GB2091521B GB 2091521 B GB2091521 B GB 2091521B GB 8201110 A GB8201110 A GB 8201110A GB 8201110 A GB8201110 A GB 8201110A GB 2091521 B GB2091521 B GB 2091521B
Authority
GB
United Kingdom
Prior art keywords
overvoltage protection
line circuit
telephone subscriber
subscriber
telephone
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
GB8201110A
Other languages
English (en)
Other versions
GB2091521A (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken 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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2091521A publication Critical patent/GB2091521A/en
Application granted granted Critical
Publication of GB2091521B publication Critical patent/GB2091521B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/18—Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
GB8201110A 1981-01-20 1982-01-15 Telephone subscriber's line circuit with overvoltage protection Expired GB2091521B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8100242A NL8100242A (nl) 1981-01-20 1981-01-20 Overspanningsbeveiliging van een lijncircuit.

Publications (2)

Publication Number Publication Date
GB2091521A GB2091521A (en) 1982-07-28
GB2091521B true GB2091521B (en) 1984-09-12

Family

ID=19836888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8201110A Expired GB2091521B (en) 1981-01-20 1982-01-15 Telephone subscriber's line circuit with overvoltage protection

Country Status (12)

Country Link
US (1) US4440980A (US06272168-20010807-M00014.png)
JP (1) JPS57138256A (US06272168-20010807-M00014.png)
AU (1) AU547336B2 (US06272168-20010807-M00014.png)
BE (1) BE891818A (US06272168-20010807-M00014.png)
BR (1) BR8200234A (US06272168-20010807-M00014.png)
CA (1) CA1175587A (US06272168-20010807-M00014.png)
DE (1) DE3200828A1 (US06272168-20010807-M00014.png)
FR (1) FR2498389A1 (US06272168-20010807-M00014.png)
GB (1) GB2091521B (US06272168-20010807-M00014.png)
IT (1) IT1150102B (US06272168-20010807-M00014.png)
NL (1) NL8100242A (US06272168-20010807-M00014.png)
SE (1) SE464327B (US06272168-20010807-M00014.png)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3215551A1 (de) * 1982-04-26 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung fuer den ueberspannungsschutz von schnittstellenschaltungen
CA1233583A (en) * 1985-06-18 1988-03-01 Francis Y. Hung Protection arrangement for a telephone subscriber line interface circuit
US4782480A (en) * 1985-11-19 1988-11-01 Alcatel Usa, Corp. Telephone line access apparatus
US4868876A (en) * 1986-05-27 1989-09-19 Siemens Aktiengesellschaft Electrostatic discharge protection device
US4991051A (en) * 1986-09-12 1991-02-05 Northern Telecom Limited Protection arrangements for communications lines
GB2225908B (en) * 1988-11-11 1993-01-13 Texas Instruments Ltd Improvements in or relating to overvoltage protection circuits
JP2838836B2 (ja) * 1990-04-26 1998-12-16 富士通株式会社 半導体集積回路及び半導体集積回路装置
US5384603A (en) * 1993-09-28 1995-01-24 Multiplex Technology, Inc. Video signal splitter with DC short circuit protection
DE4402461A1 (de) * 1994-01-28 1995-08-03 Sel Alcatel Ag Schutzschaltung für eine Teilnehmeranschlußschaltung sowie Teilnehmeranschlußschaltung damit
US5539820A (en) * 1994-10-06 1996-07-23 Northern Telecom Limited Protection of active telephone line interface circuits
JPH1146120A (ja) * 1997-07-25 1999-02-16 Mitsubishi Electric Corp 差動増幅回路
US6061445A (en) * 1997-09-15 2000-05-09 Conexant Systems, Inc. Surge protection data access arrangement (DAA)
US5862031A (en) * 1997-11-26 1999-01-19 Analog Devices, Inc. ESD protection circuit for integrated circuits having a bipolar differential input
TW437231B (en) * 1999-09-03 2001-05-28 Ericsson Telefon Ab L M Method and arrangement for shortening the recovery time of a line driver
US6400541B1 (en) * 1999-10-27 2002-06-04 Analog Devices, Inc. Circuit for protection of differential inputs against electrostatic discharge
DE10042336B4 (de) * 2000-08-29 2006-02-16 Tenovis Gmbh & Co. Kg Schnittstelle für eine Telefonverbindung mit einer steuerbaren Spannungsversorgung
US7266154B2 (en) * 2002-05-10 2007-09-04 The Southwestern Bell Telephone Co. Digital subscriber line induction neutralizing transformer network
US7944669B2 (en) * 2007-06-29 2011-05-17 Zareba Systems, Inc. Electric fence energizer lightning protection
JP5550844B2 (ja) * 2009-03-30 2014-07-16 ラピスセミコンダクタ株式会社 半導体集積回路
US8705728B2 (en) * 2010-09-20 2014-04-22 Microsemi Semiconductor (U.S.) Inc. Shared protection scheme for multiple variable batteries

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3564338A (en) * 1967-08-03 1971-02-16 Fujitsu Ltd Overvoltage and overcurrent protective circuit for a transistor amplifier
US3486124A (en) * 1968-06-04 1969-12-23 Hewlett Packard Co Power supply amplifier having means for protecting the output transistors
GB1563802A (en) * 1975-11-10 1980-04-02 Post Office Electronic current feed circuit
SU614521A1 (ru) * 1976-06-08 1978-07-05 Предприятие П/Я Р-6947 Двухтактный усилитель с защитой от перегрузки
JPS5348405A (en) * 1976-10-15 1978-05-01 Hitachi Ltd Lighting surge protective method of exchange
NL7614118A (nl) * 1976-12-20 1978-06-22 Philips Nv Schakeling voor het beschermen van telefoon- lijnen.
DE2659044C3 (de) * 1976-12-27 1981-07-16 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zum Schutz eines gegengekoppelten zweistufigen Verstärkers gegen Überlastung und Kurzschluß
US4315304A (en) * 1977-12-27 1982-02-09 Kyber Engineering, Inc. Starting circuit for a high frequency magnetic amplifier power supply
FR2437757A2 (fr) * 1978-06-26 1980-04-25 Trt Telecom Radio Electr Joncteur d'abonne destine a assurer un couplage en deux fils ou quatre fils avec un central telephonique
SE414357B (sv) * 1978-08-17 1980-07-21 Asea Ab Overspenningsskydd for skydd av halvledarkomponenter av lageffekttyp
FR2437123A1 (fr) * 1978-09-19 1980-04-18 Thomson Ericsson Telephones So Nouveau dispositif d'alimentation electronique
NL7902160A (nl) * 1979-03-20 1980-09-23 Philips Nv Eindversterker met niet-lineaire tegenkoppeling.
NL7903662A (nl) * 1979-05-10 1980-11-12 Philips Nv Lijncircuit.
NL7903664A (nl) * 1979-05-10 1980-11-12 Philips Nv Lijncircuit.
FR2460078B1 (fr) * 1979-06-25 1986-12-12 Trt Telecom Radio Electr Joncteur d'abonne electronique
US4331994A (en) * 1979-09-28 1982-05-25 Borg-Warner Corporation Shootthrough fault protection system for a voltage source transistor inverter

Also Published As

Publication number Publication date
DE3200828A1 (de) 1982-08-19
BR8200234A (pt) 1982-11-09
NL8100242A (nl) 1982-08-16
US4440980A (en) 1984-04-03
SE8200230L (sv) 1982-07-21
IT1150102B (it) 1986-12-10
CA1175587A (en) 1984-10-02
JPS57138256A (en) 1982-08-26
SE464327B (sv) 1991-04-08
IT8219140A0 (it) 1982-01-15
GB2091521A (en) 1982-07-28
FR2498389A1 (fr) 1982-07-23
BE891818A (fr) 1982-07-19
FR2498389B1 (US06272168-20010807-M00014.png) 1984-11-09
AU7957982A (en) 1982-07-29
AU547336B2 (en) 1985-10-17

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee