Hub controller for providing deterministic access to CSMA local area network
US5355375A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Mar 18, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/417
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for deterministic access to a carrier-sense-multiple-access (CSMA) or carrier-sense-multiple-access with collision detection (CSMA/CD) local area network (LAN) alters the basic indeterminate contention algorithm of the CSMA/CD protocol LAN within a hub controller. The hub controller includes media control logic that can selectively raise a pseudo carrier control signal to each port, thereby inhibiting any CSMA/CD protocol LAN transmissions by that port. In this way, the media control logic allows the hub controller to control which of the multiple ports will be allowed to contend for access to a common internal bus within the hub controller and for how long. A variety of different deterministic contention algorithms can be implemented by the hub controller, such as sequential polling, interrupt allocation, or a combination of deterministic contention algorithms with the normal CSMA/CD indeterminate contention algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.