CA2133900A1 - Telephone Line Monitor/Alarm - Google Patents

Telephone Line Monitor/Alarm

Info

Publication number
CA2133900A1
CA2133900A1 CA2133900A CA2133900A CA2133900A1 CA 2133900 A1 CA2133900 A1 CA 2133900A1 CA 2133900 A CA2133900 A CA 2133900A CA 2133900 A CA2133900 A CA 2133900A CA 2133900 A1 CA2133900 A1 CA 2133900A1
Authority
CA
Canada
Prior art keywords
value
lines
control signal
alarm
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.)
Granted
Application number
CA2133900A
Other languages
French (fr)
Other versions
CA2133900C (en
Inventor
Robert G. Dunn
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to CA002133900A priority Critical patent/CA2133900C/en
Priority to US08/381,216 priority patent/US5696810A/en
Publication of CA2133900A1 publication Critical patent/CA2133900A1/en
Application granted granted Critical
Publication of CA2133900C publication Critical patent/CA2133900C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/24—Arrangements for testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Abstract

This invention is directed to a device for monitoring the integrity of telephone lines and for warning when the lines are inoperative. The device comprises a monitoring unit which continuously senses the voltage across the telephone lines and generates a control signal which assumes a first value when the lines are operational and a second value when the lines are inoperative. An alarm unit generates a warning signal of an audible frequency when the control signal assumes the second value, and is controlled with a switching unit. The switching unit maintains the alarm unit deactivated when the control signal has the first value and activates the alarm unit when the control signal has said second value.
CA002133900A 1994-10-07 1994-10-07 Telephone line monitor/alarm Expired - Fee Related CA2133900C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002133900A CA2133900C (en) 1994-10-07 1994-10-07 Telephone line monitor/alarm
US08/381,216 US5696810A (en) 1994-10-07 1995-01-31 Telephone line monitor/alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002133900A CA2133900C (en) 1994-10-07 1994-10-07 Telephone line monitor/alarm

Publications (2)

Publication Number Publication Date
CA2133900A1 true CA2133900A1 (en) 1996-04-08
CA2133900C CA2133900C (en) 1998-08-04

Family

ID=4154489

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002133900A Expired - Fee Related CA2133900C (en) 1994-10-07 1994-10-07 Telephone line monitor/alarm

Country Status (2)

Country Link
US (1) US5696810A (en)
CA (1) CA2133900C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5859906A (en) * 1996-11-19 1999-01-12 Thomson Consumer Electronics, Inc. Telephone switch hook interface circuit
US5796789A (en) * 1997-01-06 1998-08-18 Omega Electronics Inc. Alerting device for telephones
NZ505999A (en) * 1997-12-26 2003-07-25 Africa Dev Entpr Cc Passive telecommunication monitor system
US6429779B1 (en) * 2000-12-26 2002-08-06 Gino Petrillo Telephone line monitoring and alarm apparatus
US7295655B2 (en) * 2003-09-26 2007-11-13 Qwest Communications International Inc. Systems and methods for determining the status of telephone lines
US7531463B2 (en) * 2003-10-20 2009-05-12 Novellus Systems, Inc. Fabrication of semiconductor interconnect structure
US7508929B2 (en) 2004-10-25 2009-03-24 D Eqidio Anthony George Apparatus and method of simulating telephone “in use” signals in a line in a telephone ring system
US20060088146A1 (en) * 2004-10-25 2006-04-27 D Egidio Anthony G Telephone device with integral apparatus for simulating telephone "in use" signals in a line in a telephone ring system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827498A (en) * 1984-08-17 1989-05-02 Ross James W Telephone line and instrument tester
US4634813A (en) * 1985-02-07 1987-01-06 Secom General Corp. Wire tap detection device
US4922515A (en) * 1989-07-25 1990-05-01 American Telephone And Telegraph Company Communication network cut-off detection arrangement
US5062131A (en) * 1990-01-09 1991-10-29 Edward Kanare Telephone line monitoring circuit for providing a visual and auditory signal if the telephone line becomes inoperative
US5056131A (en) * 1990-10-29 1991-10-08 Edward Kanare Telephone line monitoring circuitry and apparatus

Also Published As

Publication number Publication date
US5696810A (en) 1997-12-09
CA2133900C (en) 1998-08-04

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed