System for implementing improved attempt-and-defer access contention protocol
US5164941A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1990 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Jan 24, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/407
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A unidirectional bus data communication system which eliminates uncertainty as to the integrity of data received by a receiver connected to the bus, which data may have been involved in truncating collisions. A plurality of data stations are connected to a unidirectional bus which has segments connected to and between the stations. Each of the stations is connected to an upstream segment by a sense (S) lead and to a downstream segment by a transmit (T) lead. Each station is adapted to sense energy via its S lead arriving on an associated upstream segment of the bus and includes a transmitter for transmitting data signals via its T lead on an associated downstream segment of the bus. Signal delay elements interconnect upstream and downstream segments of the bus bypassing each of the stations. The time delay D of each of the signal delay elements is a function of the total interval of a predetermined group of data signal bit durations of the data signals added to a period T.sub.d which is equal to the time between arrival of energy at an S lead and the instant when an associated transmitting means can, in response to such detection, stop transmitting energy on its T lead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.