JPS6451858A - Security system using telephone line - Google Patents

Security system using telephone line

Info

Publication number
JPS6451858A
JPS6451858A JP20956187A JP20956187A JPS6451858A JP S6451858 A JPS6451858 A JP S6451858A JP 20956187 A JP20956187 A JP 20956187A JP 20956187 A JP20956187 A JP 20956187A JP S6451858 A JPS6451858 A JP S6451858A
Authority
JP
Japan
Prior art keywords
telephone line
alarm
talking
idle time
security system
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.)
Pending
Application number
JP20956187A
Other languages
Japanese (ja)
Inventor
Yoshihide Iiyama
Masao Uehata
Masami Nakahara
Shoshichi Funatsu
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP20956187A priority Critical patent/JPS6451858A/en
Publication of JPS6451858A publication Critical patent/JPS6451858A/en
Pending legal-status Critical Current

Links

Landscapes

  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To effectively utilize the telephone line and simultaneous alarm supervision by using a talking idle time of a telephone line as an alarm supervision. CONSTITUTION:An alarm from a sensor at the user's home is converted into various frequencies by a security adaptor 3, the alarm side is cut off in receiving the signal and the signal is sent through a telephone line 2 by the operation of the cut-off relay of voltage fluctuation detection circuits 3-2, 4-2 cutting off the transmission/reception side in the talking idle time. Thus, it is possible to use the titled system as the security system other than the talking in the range that the idle time of the telephone line is utilized and no hindrance is given to attain the effective utilization of the telephone line.
JP20956187A 1987-08-24 1987-08-24 Security system using telephone line Pending JPS6451858A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20956187A JPS6451858A (en) 1987-08-24 1987-08-24 Security system using telephone line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20956187A JPS6451858A (en) 1987-08-24 1987-08-24 Security system using telephone line

Publications (1)

Publication Number Publication Date
JPS6451858A true JPS6451858A (en) 1989-02-28

Family

ID=16574865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20956187A Pending JPS6451858A (en) 1987-08-24 1987-08-24 Security system using telephone line

Country Status (1)

Country Link
JP (1) JPS6451858A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0591216A (en) * 1991-09-26 1993-04-09 Matsushita Electric Ind Co Ltd Automatic notice equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0591216A (en) * 1991-09-26 1993-04-09 Matsushita Electric Ind Co Ltd Automatic notice equipment

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