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1 definition found
 for Carrierless Amplitude/Phase Modulation
From The Free On-line Dictionary of Computing (18 March 2015) :

  Carrierless Amplitude/Phase Modulation
      (CAP) A design of Asymmetric Digital
     Subscriber Line transceiver developed by Bell Labs.  CAP
     was the first ADSL design to be commercially deployed and, as
     of August 1996, was installed on more lines than any other.
     CAP is a variation of Quadrature Amplitude Modulation, the
     modulation used by most existing modems in 1997.  With CAP,
     the three channels ({POTS, downstream data and upstream data)
     are supported by splitting the frequency spectrum.  Voice
     occupies the standard 0-4 Khz frequency band, followed by the
     upstream channel and the high-speed downstream channel.

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