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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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Chapter1 Overview of Cisco uBR7200 Series Software
DOCSIS and CMTS Interoperability
Figure1-2 EuroDOCSIS and STB Architecture
DOCSIS-Compliant Downstream Signals
Downstream signals are modulated using 64 or 256 Quadrature Amplitude Modulation (QAM-64 or
QAM-256), based on the cableinterface card used, your cable plant, and the significance of the data.
DOCSIS defines the messages and data types for CMTS to cable modem (or cable modem in an STB)