Hub controller for providing deterministic access to CSMA local area network
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Mar 18, 1993
filing date -
Mar 18, 1993
priority date (Note) -
Expired
status (Latency Note)
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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.
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