Collision avoiding system and protocol for a multiple access digital communications system
US4439763A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1981 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Sep 3, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/417
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
With the advent of digital communications, it is common to transfer packets of information among a plurality of stations, e.g., digital computers. In order to control the transfer of the packets, various protocols have been introduced. However, the efficiency related to known multiples access digital communications system protocols tends to decrease as the digital signal rate increases. To overcome such problems, the instant communications system and protocol contemplate a communications loop having first and second oppositely directed signal paths. At least two stations are coupled to both the first and the second signal paths. A station includes an arrangement for writing a first signal on the first path and an arrangement for reading a second signal from the second path. In addition, the station includes an arrangement for reading a third signal from the first path. The third signal is coupled from the first path to the station by an arrangement which electrically precedes the arrangement for writing the first signal on the first path. If the station has a packet to transmit, it can overwrite a busy control field of the third signal packet on the first path. Having read the thir…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.