Data Over Cable Service Interface Specification
<communications, networking> (DOCSIS) ITU-approved interface requirements for cable modems involved in high-speed data distribution over a cable television network.
DOCSIS compatible equipment uses a 6 MHz carrier band for downstream, using 64 and 256 QAM (ITU Annex B), and QPSK and 16 QAM for upstream, allowing up to 36 and 10 Mb/s, respectively for downstream and upstream channels.
CableLabs FAQ (http://www.cablemodem.com/FAQs.html).
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