JPS54139319A - Key telephone system - Google Patents
Key telephone systemInfo
- 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
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
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)
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 |
-
1978
- 1978-04-20 JP JP4738378A patent/JPS54139319A/en active Granted
Cited By (4)
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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