Modulation Techniques

• V.27 ter

  • 2400 and 4800 bps
  • modulation at 1600 baud
  • carrier at 1800Hz
  • bits encoded at 8 phases, 3 bit per phase at 4800, 4 phases, 2 bit per phase 2400

• V.29 - similar, but higher rates

• V.33 and V.17 -yet higher, trellis coded

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