JPS55124351A - Signal transmission system - Google Patents
Signal transmission systemInfo
- Publication number
- JPS55124351A JPS55124351A JP3102979A JP3102979A JPS55124351A JP S55124351 A JPS55124351 A JP S55124351A JP 3102979 A JP3102979 A JP 3102979A JP 3102979 A JP3102979 A JP 3102979A JP S55124351 A JPS55124351 A JP S55124351A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- detected
- telephone
- call
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Abstract
PURPOSE:To secure the call-priority state for the subscriber's telephone even under the data communication, by transmitting the AC reply signal from the terminal unit when the specified terminal call signal is detected by the network control unit. CONSTITUTION:Exchange 1 catches telephone circuit 2 and then inverts the polarity of circuit 2 to secure the piling of the specified terminal call signal. Switch circuit 41 is closed by the polarity inversion of circuit 2, and the call signal is detected by signal detection circuit 42a to close switch circuit 43a. Thus the connection line is closed between circuit 2 and terminal unit 5a. As a result, unit 5a is started to transmit AC replay signal Sa. Then telephone 3 is hooked off to be detected by off-hook detection circuit 44, and thus circuit 41 is turned off to cut off signal Sa. As a result, exchange 1 detects the cut-off of signal Sa to give the priority to the call of telephone 3. At the same time, signal Sa is detected at the center unit to complete the data communication.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3102979A JPS588183B2 (en) | 1979-03-19 | 1979-03-19 | Signal transmission method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3102979A JPS588183B2 (en) | 1979-03-19 | 1979-03-19 | Signal transmission method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55124351A true JPS55124351A (en) | 1980-09-25 |
JPS588183B2 JPS588183B2 (en) | 1983-02-15 |
Family
ID=12320079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3102979A Expired JPS588183B2 (en) | 1979-03-19 | 1979-03-19 | Signal transmission method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS588183B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59132274A (en) * | 1983-01-19 | 1984-07-30 | Oki Electric Ind Co Ltd | Calling system of subscriber |
JPS61200790A (en) * | 1985-03-01 | 1986-09-05 | Sharp Corp | Image information transmission system |
-
1979
- 1979-03-19 JP JP3102979A patent/JPS588183B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59132274A (en) * | 1983-01-19 | 1984-07-30 | Oki Electric Ind Co Ltd | Calling system of subscriber |
JPS61200790A (en) * | 1985-03-01 | 1986-09-05 | Sharp Corp | Image information transmission system |
Also Published As
Publication number | Publication date |
---|---|
JPS588183B2 (en) | 1983-02-15 |
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