JPS5673955A - Callout circuit for telephone set - Google Patents

Callout circuit for telephone set

Info

Publication number
JPS5673955A
JPS5673955A JP15114679A JP15114679A JPS5673955A JP S5673955 A JPS5673955 A JP S5673955A JP 15114679 A JP15114679 A JP 15114679A JP 15114679 A JP15114679 A JP 15114679A JP S5673955 A JPS5673955 A JP S5673955A
Authority
JP
Japan
Prior art keywords
signal
callout
main device
telephone set
circuit
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
JP15114679A
Other languages
Japanese (ja)
Inventor
Morio Takiguchi
Kensaku Yoshizawa
Mamoru Nozawa
Nobuo Kobayashi
Minoru Sasai
Masaaki Kato
Juichi Tanabe
Setsuo Oshima
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.)
HASEGAWA DENKI SEISAKUSHO KK
NAKAYO TSUSHINKI KK
Meisei Electric Co Ltd
NEC Platforms Ltd
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Taiko Electric Works Ltd
Kanda Tsushin Kogyo Co Ltd
Nakayo Telecommunications Inc
Original Assignee
HASEGAWA DENKI SEISAKUSHO KK
NAKAYO TSUSHINKI KK
Meisei Electric Co Ltd
Iwatsu Electric Co Ltd
Nippon Telegraph and Telephone Corp
Taiko Electric Works Ltd
Kanda Tsushin Kogyo Co Ltd
Nakayo Telecommunications Inc
Nitsuko 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 HASEGAWA DENKI SEISAKUSHO KK, NAKAYO TSUSHINKI KK, Meisei Electric Co Ltd, Iwatsu Electric Co Ltd, Nippon Telegraph and Telephone Corp, Taiko Electric Works Ltd, Kanda Tsushin Kogyo Co Ltd, Nakayo Telecommunications Inc, Nitsuko Corp filed Critical HASEGAWA DENKI SEISAKUSHO KK
Priority to JP15114679A priority Critical patent/JPS5673955A/en
Publication of JPS5673955A publication Critical patent/JPS5673955A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Abstract

PURPOSE:To simplify the circuit constitution, by transmitting the callout signal and control signal from the main device to each telephone set through the use of a single signal line. CONSTITUTION:Each of a plurality of telephone sets TL1-TLn connected in parallel with the main device ME, is provided with circuits A1-An which amplify the callout signal from the main device ME and speakers SP1-SPn, and callout signal and control signal for the amplifying circuits are transmitted from the main device ME. Further, single signal lines L1-Ln are provided to each telephone set from the callout signal source SG of the main device ME, and a DC potential source for the control signal in the main device ME is connected to signal lines via a gate TR0. when the production of callout signal is started, the gate TR0 is controlled and the signal source SG is operated, and the callout signal and the control signals are transmitted with single signal lines.
JP15114679A 1979-11-21 1979-11-21 Callout circuit for telephone set Pending JPS5673955A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15114679A JPS5673955A (en) 1979-11-21 1979-11-21 Callout circuit for telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15114679A JPS5673955A (en) 1979-11-21 1979-11-21 Callout circuit for telephone set

Publications (1)

Publication Number Publication Date
JPS5673955A true JPS5673955A (en) 1981-06-19

Family

ID=15512369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15114679A Pending JPS5673955A (en) 1979-11-21 1979-11-21 Callout circuit for telephone set

Country Status (1)

Country Link
JP (1) JPS5673955A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008174196A (en) * 2007-01-22 2008-07-31 Nishikawa Rubber Co Ltd Weather strip

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5234601A (en) * 1975-09-12 1977-03-16 Iwatsu Electric Co Ltd Calling circuit
JPS5357703A (en) * 1976-11-04 1978-05-25 Kanda Tsushin Kogyo Kk System for controlling individual calling of extension telephone of key telephone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5234601A (en) * 1975-09-12 1977-03-16 Iwatsu Electric Co Ltd Calling circuit
JPS5357703A (en) * 1976-11-04 1978-05-25 Kanda Tsushin Kogyo Kk System for controlling individual calling of extension telephone of key telephone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008174196A (en) * 2007-01-22 2008-07-31 Nishikawa Rubber Co Ltd Weather strip

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