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How does a cable modem work?

Cable modems modulate and demodulate RF signals. The cable modem receives data in what is known as the downstream signal. This signal is modulated on television channels that are 6 MHz wide at frequencies between 88 and 750MHz. Using QAM 64 technology, downstream speeds can reach up to 27Mb/s on the 6 MHz channel, through which the data is transferred. This signal usually runs adjacent to other television signals.