Multiplex communications – Wide area network – Packet switching
Patent
1993-03-18
1994-10-11
Hsu, Alpus H.
Multiplex communications
Wide area network
Packet switching
370 853, 370 858, 370 952, 34082508, H04J 316, H04Q 900
Patent
active
053553756
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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Hsu Alpus H.
Network Systems Corporation
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