Silicon Graphics, Incorporated

Brian T Hillert

Gregory Michael Thorson

Rodney A Ruesch

Joseph Martin Placek

Frank Nolan Cornett

Philip Nord Jenkins

Terrance L Bowman

Nan Ma

John F DeRyckere

Michael R Arneson

The present invention is directed toward a communications channel comprising a link level protocol, a driver, a receiver, and a canceller/equalizer. The link level protocol provides logic for DC-free signal encoding and recovery as well as supporting many features including CRC error detection and message resend to accommodate infrequent bit errors across the medium. The canceller/equalizer provides equalization for destabilized data signals and also provides simultaneous bi-directional data transfer. The receiver provides bit deskewing by removing synchronization error, or skewing, between data signals. The driver provides impedance controlling by monitoring the characteristics of the communications medium, like voltage or temperature, and providing a matching output impedance in the signal driver so that fewer distortions occur while the data travels across the communications medium.

Method and apparatus for communicating computer data from one point to another over a communications medium

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Chippewa Falls, WI, United States of America

Brian T Hillert