CNET GLOSSARY: Terms for the techie
64-state quadrature amplitude modulation
This digital frequency modulation technique is primarily used for sending data downstream over a coaxial cable network. 64QAM is very efficient, supporting up to 28Mbps peak transfer rates over a single 6MHz channel. But 64QAM's susceptibility to signal interference makes it ill-suited for upstream transmissions from the cable subscriber to the Internet.
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