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8b/10b

Discussion in 'Electronic Basics' started by Wong, Oct 5, 2004.

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  1. Wong

    Wong Guest

    Hi,
    What is the meaning of DC balance in 8b/10b?
    Any good tutorial on 8b/10b encoding ?
    I search through google but cant give me a good one.
    Thanks in advace.
     
  2. Bob

    Bob Guest

    DC balance means that, over some (agreed upon) maximum number of data bits,
    there are equal number of 1's (positive voltage) and 0's (negative voltage).
    This is required because the signal that has been encoded needs to be passed
    either through a capacitor and/or a transformer (both of which will not pass
    a signal whose average level is anything but zero volts).

    Also, the coded bytes (every 8 bits are encoded into a 10 bit word) ensure
    that there are enough transitions between 0's to 1's (and 1's to 0's) so
    that a clock can be regenerated at the receiving end.

    There should be a ton of stuff on the web. You're not searching hard enough
    if you haven't found what you need.

    Bob
     
  3. Dbowey

    Dbowey Guest

    tatto0posted:

    << What is the meaning of DC balance in 8b/10b?
    Any good tutorial on 8b/10b encoding ?
    I search through google but cant give me a good one.
    Google search for "8B10B code" and for more than you want, search for
    "transmission line-code."

    Don
     
  4. Wong

    Wong Guest

    Yes, this is what I am looking for. "Troublesome" keywords I have been used.
     
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