Biphase

• Biphase-M (mark)

  always a transition at beginning of interval
  
  1: transition in middle of interval
  0: no transition in middle of interval

• Biphase-S (space)

  as Biphase-M, but behavior of 1 & 0 reversed
  

• Differential Manchester

  always a transition at middle of interval
  
  1: no transition at beginning of interval
  0: transition at beginning of interval

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