| Carrierless Amplitude/Phase Modulation (CAP) A design of developed by . 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 , the modulation used by most existing in 1997. With CAP, the three channels (, 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. (1997-10-08) |
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