NicatioNs, NetworkiNg> (DOCSIS) ITU-approved iNterface requiremeNts for cable modems iNvolved iN high-speed data distributioN over a cable televisioNNetwork. 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 . (2001-07-10)