DOCSIS cable modems, residential
gateways based on CableHome [5], Voice over IP (VoIP) telephony devices based on
PacketCable [6], and extensions to the DOCSIS specification such as L2VPN and TDM
Emulation, are among the elements making this transition possible.
To date, one of the most successful and cost-effective means for providing residential
broadband data services is via cable modems compliant with DOCSIS specifications.
DOCSIS is a technology standard that was originally created to deliver high-speed data
over the HFC cable network in North America. DOCSIS has since become a highly successful
standards family comprised of four versions (1.0, 1.1, 2.0, and 3.0) that has gained
significant worldwide popularity as a high-speed access technology and has become the
foundation upon which a number of new services are being developed. As of the end of
2006, over 100 million DOCSIS-compliant cable modems have shipped worldwide [7].
158 Chapter 6
When Does This Solution Fit?
The DOCSIS specification was originally designed to cost effectively offer broadband
(1??“10 Mbps) access-network connectivity to a large number of residential customers
over the existing CATV plant, sharing the spectrum with analog and digital video
services.
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