CableLabs is an industry consortium that sets the standards for DOCSIS compliance.
On the downstream side either 64QAM or 256QAM is possible, with 256QAM being the usual case. Both occupy 6MHz of spectrum.
On the upstream either QPSK or 16QAM may be employed with 200Khz, 400KHz, 800KHz, 1.6MHz, or 3.2MHz of spectrum being used.
DOCSIS 1.1 builds upon 1.0, but also includes the following features:
Quality of Service
Payload Header Suppression
View-based access control and management (VACM)
CM Account Management
CableLabs maintains the list of modems that are compatible with DOCSIS, CableHome and PacketCable specifications.
The Certified Modem List is a large PDF file.
Currently, there are 3 different version specifications for DOCSIS. DOCSIS 1.0, 1.1 2.0 and 3.0. DOCSIS standards are set by CableLabs »www.cablelabs.com
The most common implementation is DOCSIS 2.0, with 3.0 being adopted quickly.
For details on the different CableModem/DOCSIS specs, please see »www.cablemodem.com/ and »www.cablemodem.com/speci ··· dex.html