(DOCSIS) ITU-approved interface requirements forcable modems involved in high-speed data distribution over a cable television network. DOCSIS compatible equipment uses a 6 MHz carrier band fordownstream, using 64 and 256 QAM (ITU Annex B), and QPSK and 16 QAM forupstream, allowing up to 36 and 10 Mb/s, respectively for downstream and upstream channels. CableLabs FAQ . (2001-07-10)