JPS5793792A - Signal transmission system in key telephone device - Google Patents
Signal transmission system in key telephone deviceInfo
- Publication number
- JPS5793792A JPS5793792A JP55170240A JP17024080A JPS5793792A JP S5793792 A JPS5793792 A JP S5793792A JP 55170240 A JP55170240 A JP 55170240A JP 17024080 A JP17024080 A JP 17024080A JP S5793792 A JPS5793792 A JP S5793792A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse
- pulse train
- transmitted
- answer
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Bidirectional Digital Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
PURPOSE:To simplify the device and to reduce the cost, by controlling the 1st count means in a main device and the 2nd count means in each telephone set are made to be synchronizing. CONSTITUTION:Counter circuits 4, 10 are activated with a basic clock pulse of the same timing from clock pulse generating circuits 5, 11. When a pulse indicating the state of count of the circuit 4 is applied to a start pulse train generating circuit 1, start pulse trains of a plurality of bits of constitution predetermined from the output are formed and transmitted to a telephone set via a transmission line 13. The pulse trains are received at a start pulse generating circuit 7 and the counter circuit 10. The circuit 10 starts a data output circuit 8. The transmitted data ME KT from the main device is transmitted to the circuit 8 via a control circuit 2 and transmission line 13, and outputted to a data output terminal. When the transmission is finished, the circuit 10 transmits an answer pulse train to an answer pulse train generating circuit 11. The circuit 11 transmits the answer pulse train to the main device via an output circuit 9 and a line 13.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55170240A JPS5793792A (en) | 1980-12-04 | 1980-12-04 | Signal transmission system in key telephone device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55170240A JPS5793792A (en) | 1980-12-04 | 1980-12-04 | Signal transmission system in key telephone device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5793792A true JPS5793792A (en) | 1982-06-10 |
Family
ID=15901261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55170240A Pending JPS5793792A (en) | 1980-12-04 | 1980-12-04 | Signal transmission system in key telephone device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5793792A (en) |
-
1980
- 1980-12-04 JP JP55170240A patent/JPS5793792A/en active Pending
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