DOCSIS -  Now known as The CableLabsŪ Certified™ Cable Modem Project. These DOCSIS-based next generation cable modem systems provide users with high-speed access to packet-based data services. These services include Internet usage, packet telephony, video conferencing and telecommuting (i.e., remote access to private networks).

As frequency allocation band plans differ between U.S. and European cable TV systems, DOCSIS standards have been modified for use in Europe. European changes were published under the name of "EuroDOCSIS".


The European's comparable specification for these “next generation” of cable modems, is produced by DVB/DAVIC and published by the ETSI.

In Europe DOCSIS can compete with the DVB standard.

web/20070607123525/http://cablemodem.com/faq/#FAQ3
http://en.wikipedia.org/wiki/DOCSIS
http://informitv.com/resources/glossary
http://www.cablemodem.com


DOCSIS 2.0

DOCSIS 3.0 - CableLabsŪ, through its member cable operators, established the DOCSISŪ 3.0 Channel Bonding Initiative. The goal of this initiative is to develop a standardized approach to bond multiple physical channels into a single, virtual, high-bandwidth channel. It's architecture is compatible with earlier versions of DOCSIS.

DOCSIS 3.0 will allows cable operators to provide data rates in the hundreds of megabits and potentially gigabits per second. 

DOCSIS 3.0 Channel Bonding enables super high speeds by creating a single “Logical Channel” composed of a number of 6 MHz channels in parallel. The Initiative features IPv6 and Channel Bonding. This makes it so multiple downstream and upstream channels can be used together at the same time by a single subscriber. This speeds up the output of the system.

More specifically Channel Bonding increases transmission speed by sending the same data over multiple modems, or a modem built specifically for channel bonding.

A goal of the DOCSISŪ 3.0 Channel Bonding Initiative is to bond multiple physical channels into a single, virtual, high-bandwidth channel.

A Logical Channel {Number} differs from a physical channel as it does not physically exist. Logical Channels however can be transported over physical channels. Packet switching allows many Logical Channels to exist simultaneously on a single physical channel. Logical Channels are non-dedicated, packet-switched communications paths between two or more points on a network.

An important part of DOCSISŪ 3.0 is it’s utilization of IPv6. Internet Protocol version 6 (IPv6) is a network layer for packet-switched Internetworks. It’s designated for general use on the Internet and as the successor of IPv4.

Particularly in North America, Logical Channels are sometimes known as Virtual Channels.

cablelabs.com/news/pr/2006/06_pr_docsis30_080706.html
www.cablemodem.com/primer
http://broadband.motorola.com/ips/pdf/Scaling_Bandwidth.pdf

See the Interactive Television Institute.