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On the upstream either QPSK or 16QAM may be employed with 200Khz, 400KHz, 800KHz, 1.6MHz, or 3.2MHz of spectrum being used.
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.
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/specifications/index.html