NO124613B - - Google Patents

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Publication number
NO124613B
NO124613B NO0048/71A NO4871A NO124613B NO 124613 B NO124613 B NO 124613B NO 0048/71 A NO0048/71 A NO 0048/71A NO 4871 A NO4871 A NO 4871A NO 124613 B NO124613 B NO 124613B
Authority
NO
Norway
Prior art keywords
monitoring
signal
monitoring object
loop
alarm
Prior art date
Application number
NO0048/71A
Other languages
English (en)
Norwegian (no)
Inventor
T Andersson
L Isheden
B Johansson
S Warring
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
Publication of NO124613B publication Critical patent/NO124613B/no

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
    • G08B25/045—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop with sensing devices and central station in a closed loop, e.g. McCullough loop
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
    • G08B29/08—Signalling of tampering with the line circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
NO0048/71A 1970-01-08 1971-01-07 NO124613B (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00162/70A SE329358B (enrdf_load_stackoverflow) 1970-01-08 1970-01-08

Publications (1)

Publication Number Publication Date
NO124613B true NO124613B (enrdf_load_stackoverflow) 1972-05-08

Family

ID=20256131

Family Applications (1)

Application Number Title Priority Date Filing Date
NO0048/71A NO124613B (enrdf_load_stackoverflow) 1970-01-08 1971-01-07

Country Status (6)

Country Link
US (1) US3710372A (enrdf_load_stackoverflow)
DE (1) DE2064858C3 (enrdf_load_stackoverflow)
DK (1) DK124153B (enrdf_load_stackoverflow)
GB (1) GB1295189A (enrdf_load_stackoverflow)
NO (1) NO124613B (enrdf_load_stackoverflow)
SE (1) SE329358B (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792469A (en) * 1972-07-17 1974-02-12 Johnson Service Co Multiplexed alarm transmission system having alarm storage circuits
FR2324172A1 (fr) * 1975-09-15 1977-04-08 Gautier Gerard Dispositif de protection antifrauduleuse pour ligne telephonique exploitee en transmission d'alarme
SE7803437L (sv) * 1978-03-28 1979-09-29 Saab Scania Ab Forfarande for att vid en anleggning vars enheter er sammanbundna medelst en kommunikationsledning for informationsberande signaler, kontinuerligt overvaka tillstandet for de till kommunikationsledningen anslutna ...
US4240078A (en) * 1978-06-07 1980-12-16 Minnesota Mining And Manufacturing Company Frequency selective annunciator system
US4262284A (en) * 1978-06-26 1981-04-14 Stieff Lorin R Self-monitoring seal
US4229734A (en) * 1978-10-26 1980-10-21 Honeywell Inc. Line supervision
US4268823A (en) * 1979-11-02 1981-05-19 Ici Americas Inc. Protective electrical system for providing indications of removal of objects from plural monitored locations by use of parallel-connected object-sensors
US4577184A (en) * 1983-05-23 1986-03-18 Tetra-Tech, Inc. Security system with randomly modulated probe signal
US4555930A (en) * 1984-02-14 1985-12-03 Control Instruments Corp. Digital gas sensing system
JPS61177841A (ja) * 1985-02-04 1986-08-09 Mitsubishi Electric Corp 直列伝送装置
US4716401A (en) * 1985-09-19 1987-12-29 Deere & Company Tamper-resistant supervisory system
ATE85737T1 (de) * 1987-08-14 1993-02-15 Siemens Ag Datenuebertragungsverfahren.
USD330339S (en) 1990-08-08 1992-10-20 Joseph Roselle Motion detecting alarm

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423649A (en) * 1944-12-08 1947-07-08 Horvitch Gerard Michael Electric burglar alarm
US3253270A (en) * 1963-08-02 1966-05-24 Downer Frank Theft alarm for shoplift prevention

Also Published As

Publication number Publication date
DK124153B (da) 1972-09-18
DE2064858B2 (de) 1973-10-31
GB1295189A (enrdf_load_stackoverflow) 1972-11-01
US3710372A (en) 1973-01-09
DE2064858A1 (de) 1971-07-15
SE329358B (enrdf_load_stackoverflow) 1970-10-05
DE2064858C3 (de) 1974-05-30

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