JPH08256197A - 電話システムの障害時のフェールセーフスイッチフック検出の方法及び回路 - Google Patents

電話システムの障害時のフェールセーフスイッチフック検出の方法及び回路

Info

Publication number
JPH08256197A
JPH08256197A JP8013323A JP1332396A JPH08256197A JP H08256197 A JPH08256197 A JP H08256197A JP 8013323 A JP8013323 A JP 8013323A JP 1332396 A JP1332396 A JP 1332396A JP H08256197 A JPH08256197 A JP H08256197A
Authority
JP
Japan
Prior art keywords
current
circuit
amplifier
telephone
line
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Withdrawn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
JP8013323A
Other languages
English (en)
Japanese (ja)
Inventor
Gerald M Cotreau
エム コトゥロー ジェルルド
Donald K Whitney Jr
ケイ ホイットニー ジュニア ドナルド
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.)
Harris Corp
Original Assignee
Harris 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 Harris Corp filed Critical Harris Corp
Publication of JPH08256197A publication Critical patent/JPH08256197A/ja
Withdrawn legal-status Critical Current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
    • 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)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephone Function (AREA)
JP8013323A 1995-01-30 1996-01-29 電話システムの障害時のフェールセーフスイッチフック検出の方法及び回路 Withdrawn JPH08256197A (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US380413 1995-01-30
US08/380,413 US5812658A (en) 1995-01-30 1995-01-30 Method and circuit for failsafe switch-hook detection during fault in a telephone system

Publications (1)

Publication Number Publication Date
JPH08256197A true JPH08256197A (ja) 1996-10-01

Family

ID=23501077

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8013323A Withdrawn JPH08256197A (ja) 1995-01-30 1996-01-29 電話システムの障害時のフェールセーフスイッチフック検出の方法及び回路

Country Status (7)

Country Link
US (1) US5812658A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0724348B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPH08256197A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
KR (1) KR960030618A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CN (1) CN1136742A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE69607047T2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IN (1) IN186277B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6259589B1 (en) * 1999-05-27 2001-07-10 Twinhead International Corp. Protection apparatus applied to a telephone line

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406929A (en) * 1981-02-26 1983-09-27 Motorola Inc. Hook status detector for a subscriber loop interface circuit
CA1182230A (en) * 1982-12-17 1985-02-05 Patrick R. Beirne Subscriber line interface circuit
US4599494A (en) * 1984-10-10 1986-07-08 Motorola, Inc. Ring sense telephone tone ringer circuit
IT1215254B (it) * 1985-03-20 1990-01-31 Ates Componenti Elettron Circuito, integrabile monoliticamente, per la misura di correnti longitudinali e trasversali in una linea ditrasmissione bifilare.
US5111497A (en) * 1990-09-17 1992-05-05 Raychem Corporation Alarm and test system for a digital added main line
US5195125A (en) * 1990-09-17 1993-03-16 Raychem Corporation Gel filled RJ11 connector
IT1248549B (it) * 1991-06-25 1995-01-19 Sgs Thomson Microelectronics Complesso circuitale telefonico ad attacco d'utente elettronico con circuito per la rivelazione dello sgancio in fase di suoneria a numerodi componenti ridotto.
JPH05145627A (ja) * 1991-09-12 1993-06-11 Fujitsu Ltd リングトリツプ検出回路

Also Published As

Publication number Publication date
EP0724348A1 (en) 1996-07-31
KR960030618A (ko) 1996-08-17
DE69607047T2 (de) 2000-10-26
IN186277B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2001-07-28
US5812658A (en) 1998-09-22
CN1136742A (zh) 1996-11-27
EP0724348B1 (en) 2000-03-15
DE69607047D1 (de) 2000-04-20

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Legal Events

Date Code Title Description
A300 Application deemed to be withdrawn because no request for examination was validly filed

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20030401