Decentralized data transmission system
US4227178A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1978 |
| Grant date | Oct 7, 1980 |
| Priority date | — |
| Expiry date | Sep 21, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/423
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Described is a decentralized data transmission system and a method of operating the system. A relatively high speed transmission medium connects a number of relatively lower speed terminals in a loop or similar configuration. A central or monitoring station is connected in the transmission medium which includes a memory table containing the listing of the station addresses connected to the transmission loop. The monitoring station operates as a control station for transmitting the address of a first station to be enabled to transmit a message. The addressed station recognizes its address and responds either with a message destined for another station or with a signal that no message is to be sent. At the end of a message, an enabled station sends a special character to notify the monitoring station that the next station in the memory table can be addressed to grant usage of the transmission medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.