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Network system for linking user nodes using high speed CSMA/CD communication

  • US 5,852,635 A
  • Filed: 03/31/1997
  • Issued: 12/22/1998
  • Est. Priority Date: 01/25/1994
  • Status: Expired due to Fees
First Claim
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1. A local area network communicating CSMA/CD data over a medium comprising:

  • a plurality of nodes interconnected via a communication medium;

    an 8B6T encoding means at each node for applying a long-term d.c.-balanced three-level communication signal containing information to the communication medium, said signal applying means receiving group codes in binary form of eight units length and converting each eight-bit group to a three-level ternary code of groups of six units length, said ternary code consisting of selected d.c.-balanced six-unit symbol groups, selected plus-one-biased d.c.-unbalanced six-unit symbol groups and selected minus-one-biased d.c.-unbalanced six-unit symbol groups, and said signal applying means being operative to constrain signals to enforce a d.c. polarity reversal after transmission of each d.c.-unbalanced group; and

    an 8B6T decoding means at each node for receiving the long-term d.c.-balanced three-level communication signal from the communication medium and converting three-level information of said long-term d.c.-balanced three-level communication signal to corresponding eight-bit group binary level code by assuming a long-term d.c. balance.

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