JPS5624860A - Alarm circuit using key telephone system - Google Patents

Alarm circuit using key telephone system

Info

Publication number
JPS5624860A
JPS5624860A JP9987679A JP9987679A JPS5624860A JP S5624860 A JPS5624860 A JP S5624860A JP 9987679 A JP9987679 A JP 9987679A JP 9987679 A JP9987679 A JP 9987679A JP S5624860 A JPS5624860 A JP S5624860A
Authority
JP
Japan
Prior art keywords
contact
frequency signal
extension call
circuit
lines
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
JP9987679A
Other languages
Japanese (ja)
Other versions
JPS6020957B2 (en
Inventor
Masato Araki
Norio Saneyoshi
Akio Doi
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric Co Ltd
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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP9987679A priority Critical patent/JPS6020957B2/en
Publication of JPS5624860A publication Critical patent/JPS5624860A/en
Publication of JPS6020957B2 publication Critical patent/JPS6020957B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems

Abstract

PURPOSE:To ensure both the office call and the extension call independently from each other with the minimum number of insulated conductors for the key telephone system of the branch connection system, by forming the connecting cord for the office n circuit with 2n+2 pieces of insulated conductors. CONSTITUTION:The high frequency signal is piled onto extension call lines 42-1 and 42-2 via signal generator 7, and the voltage level of this high frequency signal is identified through monitor circuit 8. And contact s of the alarm sensor is connected to lines 42-1 and 42-2 each. Then contact ar of relay circuit AR which carries out the intermittence when contact s is turned on and element Ca which shows a low impedance to the high frequency signal are connected in series to the extension call lines. When contact s is turned on, alarm tone signal OSC is transmitted to the extension call lines. And the speaker circuit to which each slave unit is connected is actuated in response to the lowering of the level of the frequency signal when element Ca is connected.
JP9987679A 1979-08-07 1979-08-07 Alarm circuit using button telephone device Expired JPS6020957B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9987679A JPS6020957B2 (en) 1979-08-07 1979-08-07 Alarm circuit using button telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9987679A JPS6020957B2 (en) 1979-08-07 1979-08-07 Alarm circuit using button telephone device

Publications (2)

Publication Number Publication Date
JPS5624860A true JPS5624860A (en) 1981-03-10
JPS6020957B2 JPS6020957B2 (en) 1985-05-24

Family

ID=14258997

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9987679A Expired JPS6020957B2 (en) 1979-08-07 1979-08-07 Alarm circuit using button telephone device

Country Status (1)

Country Link
JP (1) JPS6020957B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887844U (en) * 1981-12-07 1983-06-14 新日本製鐵株式会社 Heat recovery device from molten slag
JPS5924177A (en) * 1982-07-29 1984-02-07 新日本製鐵株式会社 Method of treating slag
JPS5973457A (en) * 1982-10-21 1984-04-25 三菱重工業株式会社 Converter slag wind granulating device
JPS59193661A (en) * 1983-04-18 1984-11-02 Nippon Telegr & Teleph Corp <Ntt> Telephone set
JPS6452637A (en) * 1987-05-16 1989-02-28 Kubota Ltd Production of granular slag

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887844U (en) * 1981-12-07 1983-06-14 新日本製鐵株式会社 Heat recovery device from molten slag
JPS6127932Y2 (en) * 1981-12-07 1986-08-20
JPS5924177A (en) * 1982-07-29 1984-02-07 新日本製鐵株式会社 Method of treating slag
JPS6157553B2 (en) * 1982-07-29 1986-12-08 Shinnippon Seitetsu Kk
JPS5973457A (en) * 1982-10-21 1984-04-25 三菱重工業株式会社 Converter slag wind granulating device
JPS59193661A (en) * 1983-04-18 1984-11-02 Nippon Telegr & Teleph Corp <Ntt> Telephone set
JPS6452637A (en) * 1987-05-16 1989-02-28 Kubota Ltd Production of granular slag

Also Published As

Publication number Publication date
JPS6020957B2 (en) 1985-05-24

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