Carrierless Amplitude/Phase Modulation

(communications)(CAP) A design of Asymmetric Digital Subscriber Line transceiver developed by Bell Labs. CAPwas the first ADSL design to be commercially deployed and, asof August 1996, was installed on more lines than any other.

CAP is a variation of Quadrature Amplitude Modulation, themodulation 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. Voiceoccupies the standard 0-4 Khz frequency band, followed by theupstream channel and the high-speed downstream channel.

单词	carrierless amplitude/phase modulation
释义	Carrierless Amplitude/Phase Modulation Carrierless Amplitude/Phase Modulation (communications)(CAP) A design of Asymmetric Digital Subscriber Line transceiver developed by Bell Labs. CAPwas the first ADSL design to be commercially deployed and, asof August 1996, was installed on more lines than any other. CAP is a variation of Quadrature Amplitude Modulation, themodulation 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. Voiceoccupies the standard 0-4 Khz frequency band, followed by theupstream channel and the high-speed downstream channel. AcronymsSeeCAP
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