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

United States Patent

July 24, 2007
View the Complete Patent at the US Patent & Trademark Office
Lawrence Livermore National Laboratory - Visit the Industrial Partnerships Office Website
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.
Arneson; Michael R. (Chippewa Falls, WI), Bowman; Terrance L. (Sumner, WA), Cornett; Frank N. (Chippewa Falls, WI), DeRyckere; John F. (Eau Claire, WI), Hillert; Brian T. (Chippewa Falls, WI), Jenkins; Philip N. (Eau Claire, WI), Ma; Nan (Chippewa Falls, WI), Placek; Joseph M. (Chippewa Falls, WI), Ruesch; Rodney (Eau Claire, WI), Thorson; Gregory M. (Altoona, WI)
Silicon Graphics, Inc. (Sunnyvale, CA)
09/ 620,373
July 20, 2000
STATEMENT OF RIGHTS IN INVENTION The United States Government has rights to use this invention pursuant to subcontract B338314 issued by the University of California, which operates Lawrence Livermore National Laboratory for the United States Department of Energy under Contract No. W-7405-ENG-48.