NO991801L - FremgangsmÕte for forbedring av et telefonsystem - Google Patents

FremgangsmÕte for forbedring av et telefonsystem

Info

Publication number
NO991801L
NO991801L NO991801A NO991801A NO991801L NO 991801 L NO991801 L NO 991801L NO 991801 A NO991801 A NO 991801A NO 991801 A NO991801 A NO 991801A NO 991801 L NO991801 L NO 991801L
Authority
NO
Norway
Prior art keywords
improving
telephone system
arrangement
voltage
procedure
Prior art date
Application number
NO991801A
Other languages
English (en)
Other versions
NO991801D0 (no
Inventor
Johan P Steller
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to NO991801A priority Critical patent/NO991801L/no
Publication of NO991801D0 publication Critical patent/NO991801D0/no
Priority to US09/326,411 priority patent/US6411694B1/en
Priority to PCT/EP2000/003418 priority patent/WO2000064126A2/en
Priority to AU39669/00A priority patent/AU3966900A/en
Publication of NO991801L publication Critical patent/NO991801L/no

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Telephone Function (AREA)

Abstract

Den foreliggende oppfinnelse vedrører et arrangement for å forbedre et telefonsystem, i hvilket en rekke analoge tele- foner er koblet til en enkelt linje, og med den hensikt å tilveiebringe et arrangement som kan løse problemet rela- tert til avbrudd av en pågående samtale eller modemforbin- delse i en gruppe av parallelt koblede telefoner, er det ifølge den foreliggende oppfinnelse foreslått at nevnte ar- rangement omfatter organer for spenningsavføling, nevnte organer for spenningsavføling er innrettet til å avføle en første høyere DC-spenning over linjen i stand-by-modus, så vel som en andre lavere DC-spenning i aktivt (samtale) modus.
NO991801A 1999-04-15 1999-04-15 FremgangsmÕte for forbedring av et telefonsystem NO991801L (no)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NO991801A NO991801L (no) 1999-04-15 1999-04-15 FremgangsmÕte for forbedring av et telefonsystem
US09/326,411 US6411694B1 (en) 1999-04-15 1999-06-04 Arrangement for improving a telephone system
PCT/EP2000/003418 WO2000064126A2 (en) 1999-04-15 2000-04-14 Arrangement for improving a telephone system
AU39669/00A AU3966900A (en) 1999-04-15 2000-04-14 Arrangement for improving a telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO991801A NO991801L (no) 1999-04-15 1999-04-15 FremgangsmÕte for forbedring av et telefonsystem

Publications (2)

Publication Number Publication Date
NO991801D0 NO991801D0 (no) 1999-04-15
NO991801L true NO991801L (no) 2000-10-16

Family

ID=19903206

Family Applications (1)

Application Number Title Priority Date Filing Date
NO991801A NO991801L (no) 1999-04-15 1999-04-15 FremgangsmÕte for forbedring av et telefonsystem

Country Status (2)

Country Link
US (1) US6411694B1 (no)
NO (1) NO991801L (no)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7012523B2 (en) * 2002-11-05 2006-03-14 Stuart John C System for surveillance of and communication with residential entryway from remote location using existing telephone lines

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4136266A (en) * 1978-02-21 1979-01-23 Cohen Eric S Telephone intruder alert system
US4169217A (en) * 1978-02-27 1979-09-25 Northern Telecom Limited Line status apparatus for telephones
US4332983A (en) 1980-10-27 1982-06-01 Hosein Vakili Telephone privacy controller
US4546214A (en) * 1983-12-22 1985-10-08 Northern Telecom Limited Line use indicator for telephone sets sharing a single line
GB2154392A (en) 1984-02-15 1985-09-04 Peter Henderson Telephone in use indicator (line busy lamp)
US4726048A (en) * 1984-04-03 1988-02-16 Waldman Herbert H Telephone privacy circuit
ES282513Y (es) 1984-11-12 1986-10-01 Amper, S.A. Dispositivo exclusor para telefonos instalados en paralelo
US4653094A (en) 1985-03-19 1987-03-24 Rasmussen Harry R Telephone set line status display
US4747128A (en) 1986-05-22 1988-05-24 Chan Kwok Leung Telephone privacy protector
IT1219764B (it) 1988-06-29 1990-05-24 Cselt Centro Studi Lab Telecom Dispositivo per l'uso esclusivo di una singola linea telefonica da parte di un telefono in impianti dotati di una molteplicita di telefoni
US5414764A (en) * 1990-12-10 1995-05-09 Canon Kabushiki Kaisha Communications apparatus
GB2266430B (en) 1992-04-13 1996-02-28 Clive Richard Harris Call connection priority designator
US5422947A (en) * 1993-02-23 1995-06-06 Design Tech International Inc. Telephone in-use indicator
JP3012433B2 (ja) * 1993-02-26 2000-02-21 シャープ株式会社 公衆回線を用いる通信装置およびその方法
US5388153A (en) * 1993-03-26 1995-02-07 At&T Corp. Apparatus and method for detecting telephone line status
US5533117A (en) * 1993-08-03 1996-07-02 Chong H. Kim Line status indicator for use with telephones sharing a single line
US5465297A (en) * 1994-03-11 1995-11-07 Design Tech International Inc. Telephone line seizure circuit
JP2846815B2 (ja) * 1994-05-18 1999-01-13 キヤノン株式会社 電話装置
KR960039801A (ko) * 1995-04-26 1996-11-25 김광호 병렬 접속된 전화기의 예약 다이얼링 방법
US5771285A (en) * 1996-02-07 1998-06-23 Lucent Technologies Circuit and method for detecting telephone line status and telephone instrument embodying the same
US5796789A (en) 1997-01-06 1998-08-18 Omega Electronics Inc. Alerting device for telephones

Also Published As

Publication number Publication date
US6411694B1 (en) 2002-06-25
NO991801D0 (no) 1999-04-15

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Legal Events

Date Code Title Description
FC2A Withdrawal, rejection or dismissal of laid open patent application