CA2256805C - Telecommunications off-hook and intrusion detection method and apparatus - Google Patents

Telecommunications off-hook and intrusion detection method and apparatus Download PDF

Info

Publication number
CA2256805C
CA2256805C CA002256805A CA2256805A CA2256805C CA 2256805 C CA2256805 C CA 2256805C CA 002256805 A CA002256805 A CA 002256805A CA 2256805 A CA2256805 A CA 2256805A CA 2256805 C CA2256805 C CA 2256805C
Authority
CA
Canada
Prior art keywords
voltage
value
telephone line
frequency
tip
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 - Fee Related
Application number
CA002256805A
Other languages
English (en)
French (fr)
Other versions
CA2256805A1 (en
Inventor
Rodney C. Hemminger
Albert H. Maxwell, Jr.
Michael A. Murphy
Thomas J. Van Heuklon
Richard L. Tenor
Todd P. Kelsey
Fred F. Schleifer
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.)
Elster Solutions LLC
Original Assignee
Elster Electricity LLC
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 Elster Electricity LLC filed Critical Elster Electricity LLC
Publication of CA2256805A1 publication Critical patent/CA2256805A1/en
Application granted granted Critical
Publication of CA2256805C publication Critical patent/CA2256805C/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
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • 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
    • H04M1/7385—Programmable or microprocessor-controlled
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Telephonic Communication Services (AREA)
  • Alarm Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
CA002256805A 1997-12-24 1998-12-21 Telecommunications off-hook and intrusion detection method and apparatus Expired - Fee Related CA2256805C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/998,166 US6470083B1 (en) 1997-12-24 1997-12-24 Telecommunications off-hook and intrusion detection method and apparatus
US08/998,166 1997-12-24

Publications (2)

Publication Number Publication Date
CA2256805A1 CA2256805A1 (en) 1999-06-24
CA2256805C true CA2256805C (en) 2006-08-15

Family

ID=25544864

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002256805A Expired - Fee Related CA2256805C (en) 1997-12-24 1998-12-21 Telecommunications off-hook and intrusion detection method and apparatus

Country Status (2)

Country Link
US (1) US6470083B1 (US06470083-20021022-M00006.png)
CA (1) CA2256805C (US06470083-20021022-M00006.png)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999034342A1 (en) * 1997-12-24 1999-07-08 Abb Power T & D Company Inc Method and apparatus for detecting and reporting a power outage
US6778099B1 (en) * 1998-05-01 2004-08-17 Elster Electricity, Llc Wireless area network communications module for utility meters
US7113587B1 (en) * 2000-06-28 2006-09-26 Agere Systems Inc. Method and apparatus for non-disruptive telecommunication loop condition determination
FR2826217B1 (fr) * 2001-06-14 2003-12-12 Thomson Licensing Sa Dispositif de detection de prise de ligne telephonique

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022989A (en) 1976-06-28 1977-05-10 Bell Telephone Laboratories, Incorporated Telephone receiver-off-hook-and-in-use detector
SE431683B (sv) * 1977-09-23 1984-02-20 Testut Aequitas Anordning for metning av kapacitansen hos en kondensator
US4221935A (en) 1977-10-24 1980-09-09 International Standard Electric Corporation Control circuit for telephone subscriber station
US4230914A (en) 1978-11-30 1980-10-28 Cose Technology Corporation System for and method of indicating intruder presence on telephone lines, and method of installation of telephone intruder alarm system
US4232195A (en) 1978-07-19 1980-11-04 Bartelink E H B Telephone responder apparatus
US4590444A (en) * 1984-10-11 1986-05-20 National Semiconductor Corporation Voltage controlled RC oscillator circuit
US4791658A (en) 1986-07-09 1988-12-13 Theodore Simon Integrated alarm and touch tone telephone system
US4777645A (en) * 1987-02-10 1988-10-11 Harris Corp. Telephone line test and display circuit
US4811389A (en) 1987-11-12 1989-03-07 General Electric Company Parallel off hook detector for electronic remote data recorder
US5010568A (en) 1989-04-04 1991-04-23 Sparton Corporation Remote meter reading method and apparatus
US5161182A (en) 1989-04-04 1992-11-03 Sparton Corporation Remote meter reading method and apparatus
US5134650A (en) 1991-01-22 1992-07-28 Schlumberger Industries, Inc. Dial inbound meter interface unit (MIU) for automatic meter reading using no subscriber line access controller
MX9206230A (es) 1992-02-21 1993-09-01 Abb Power T & D Co Mejoras en un contador de energia electrica activay metodos para el uso del mismo.
US5457621A (en) 1992-02-21 1995-10-10 Abb Power T&D Company Inc. Switching power supply having voltage blocking clamp
US5537029A (en) 1992-02-21 1996-07-16 Abb Power T&D Company Inc. Method and apparatus for electronic meter testing
US5381462A (en) 1992-05-29 1995-01-10 Datran Systems Corporation Utility monitor communications systems
US5929663A (en) * 1997-08-12 1999-07-27 General Electric Company Control circuit for distributed electrical equipment

Also Published As

Publication number Publication date
CA2256805A1 (en) 1999-06-24
US6470083B1 (en) 2002-10-22

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Effective date: 20161221