Description: The modulation type associated with this downstream RF channel. See the associated conformance object for write conditions an limitations. See the DOCSIS specification for specifics on the modulation profiles implied by qam64 qam256 and qam1024. qam64, qam256 and qam1024 are various modulation schemes often used in digital cable and cable modem applications. The numbers 64/256/1024 in qam represent constellation points, which is the measurement of qam transmission capability, the higher the number, higher the bits that can be transmitted.