JPS57135551A - Contention type multidrop connection system - Google Patents
Contention type multidrop connection systemInfo
- Publication number
- JPS57135551A JPS57135551A JP2095681A JP2095681A JPS57135551A JP S57135551 A JPS57135551 A JP S57135551A JP 2095681 A JP2095681 A JP 2095681A JP 2095681 A JP2095681 A JP 2095681A JP S57135551 A JPS57135551 A JP S57135551A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- control station
- transmission line
- circuit
- logical value
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/407—Bus networks with decentralised control
- H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD)
Abstract
PURPOSE:To enable contention type communication regarding each terminal by providing a contention circuit which sends a transmission request signal from a data terminal equipment to a transmission line a prescribed delay time after the end of a signal being transmitted from another terminal is detected. CONSTITUTION:A data control station 1, a transmission line 2 for transmission from a terminal side to the control station 1, a transmission line 3 for reception from the control station 1 to the terminal side, a data terminal equipment 5, a contention circuit 4, etc., are provided. When a terminal completes communication, no signal wave being transmitted is present on the transmission line 2, so the output of an A/D converter 6D is held at a ''0'' through a coupling transformer 4A regarding another terminal. After a prescribed delay time, the output logical value C of a timer G goes down to ''0'', the output logical value D of an OR circuit 6F goes up to ''1'', and the output logical value B of an AND circuit 6E goes up to ''1''. At another enqueued terminal, switches 6A and 6B are closed to send a request to the control station 1, performing necessary communication.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2095681A JPS57135551A (en) | 1981-02-17 | 1981-02-17 | Contention type multidrop connection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2095681A JPS57135551A (en) | 1981-02-17 | 1981-02-17 | Contention type multidrop connection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57135551A true JPS57135551A (en) | 1982-08-21 |
Family
ID=12041629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2095681A Pending JPS57135551A (en) | 1981-02-17 | 1981-02-17 | Contention type multidrop connection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57135551A (en) |
-
1981
- 1981-02-17 JP JP2095681A patent/JPS57135551A/en active Pending
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