JPS54139319A - Key telephone system - Google Patents

Key telephone system

Info

Publication number
JPS54139319A
JPS54139319A JP4738378A JP4738378A JPS54139319A JP S54139319 A JPS54139319 A JP S54139319A JP 4738378 A JP4738378 A JP 4738378A JP 4738378 A JP4738378 A JP 4738378A JP S54139319 A JPS54139319 A JP S54139319A
Authority
JP
Japan
Prior art keywords
relay
handset
circuit
tone
calling
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
JP4738378A
Other languages
Japanese (ja)
Other versions
JPS6255333B2 (en
Inventor
Akitoshi Aritaka
Yoshihiro Ishimura
Tatsuo Tezuka
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4738378A priority Critical patent/JPS54139319A/en
Publication of JPS54139319A publication Critical patent/JPS54139319A/en
Publication of JPS6255333B2 publication Critical patent/JPS6255333B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE: To make it possible to use handsets in plural slave stations by the single frequency of a relay, by inhibiting the transmission/receiving operation of slave stations except busy slave stations in the line where plural slave stations and a master station are connected through the relay by a wireless link.
CONSTITUTION: Relay 2 and plural slave station handsets 3 are connected by a wireless line. When a calling signal is received by relay 2, this signal is detected by calling detector circuit 22, and calling tone is generated from tone generator circuit 26 through relay detector circuit 22. Simultaneously, modulator 15 and transmitter 13 are operated to transmit the calling signal to handset 3. When answering, called handset 3 operates handset control circuit 35 through hang-up circuit 30 and transmits hang-up tone to the relay by circuit 26. Relay 2 receives this hand-up tone to make circuit 25 into a hand-up state and return a mute signal to handset 3. Handsets except hang-up handset 3 turn off transmission/receiving circuits by the mute signal, and the call is possible only for the called handset, so that privacy can be secured.
COPYRIGHT: (C)1979,JPO&Japio
JP4738378A 1978-04-20 1978-04-20 Key telephone system Granted JPS54139319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4738378A JPS54139319A (en) 1978-04-20 1978-04-20 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4738378A JPS54139319A (en) 1978-04-20 1978-04-20 Key telephone system

Publications (2)

Publication Number Publication Date
JPS54139319A true JPS54139319A (en) 1979-10-29
JPS6255333B2 JPS6255333B2 (en) 1987-11-19

Family

ID=12773569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4738378A Granted JPS54139319A (en) 1978-04-20 1978-04-20 Key telephone system

Country Status (1)

Country Link
JP (1) JPS54139319A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5937743A (en) * 1982-08-25 1984-03-01 Sanyo Electric Co Ltd Radio telephone set
JPS5943641A (en) * 1982-09-02 1984-03-10 Sanyo Electric Co Ltd Radiotelephone
JPS63100831A (en) * 1986-10-16 1988-05-02 Victor Co Of Japan Ltd Cordless telephone system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5937743A (en) * 1982-08-25 1984-03-01 Sanyo Electric Co Ltd Radio telephone set
JPH0239907B2 (en) * 1982-08-25 1990-09-07 Sanyo Electric Co
JPS5943641A (en) * 1982-09-02 1984-03-10 Sanyo Electric Co Ltd Radiotelephone
JPS63100831A (en) * 1986-10-16 1988-05-02 Victor Co Of Japan Ltd Cordless telephone system

Also Published As

Publication number Publication date
JPS6255333B2 (en) 1987-11-19

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