[SATLUG] DOCSIS III
geofff at w5omr.shacknet.nu
Tue May 20 14:16:59 CDT 2008
I saw a demonstration of this technology at the National Cable show I
was installing in New Orleans, last week.
DOCSIS® — Project Primer
*The Cable Modem & The CMTS*
Cable modems are devices at the subscriber premises that convert digital
information into a modulated radio frequency (RF) signal in the upstream
direction, and convert the RF signals to digital information in the
downstream direction. Another piece of equipment, called a cable modem
termination system (CMTS), performs the converse operation for multiple
subscribers at the cable operator's headend. .
Cable television operators have transitioned from a traditional core
business of entertainment programming to a position as full-service
providers of video, voice, and data telecommunications services. Cable
modems based on Data Over Cable Service Interface Specifications
(DOCSIS®) are among the fundamental devices making this transition
possible. To date, the most successful and cost-effective method for
providing high-speed data services is via cable modems compliant with
the DOCSIS specifications.
*Cable Modems Versus DSL*
With more than 25.4 million high-speed Internet access customers in
North America, the cable modem has become the broadband connection of
choice for many Internet users. In fact, cable modem deployments have
outstripped the nearest rival broadband technology, digital subscriber
line (DSL), by a significant margin. Yet there is still room for growth
since the total penetration of broadband access technologies in the U.S.
is currently only 40 percent. /(All statistics as of Q3 2005, Kinetic
DOCSIS: The Past and The Future
The four successive versions of the DOCSIS cable modem: DOCSIS 1.0,
DOCSIS 1.1,and DOCSIS 2.0, and, now in development, DOCSIS 3.0, provide
increasing levels of capabilities and functionality, while maintaining
multi-vendor interoperability and full backward and forward
compatibility of DOCSIS.
* DOCSIS 1.0 provides basic broadband Internet connectivity for one
or more devices in the home. Among other things, it includes the
ability to rate-limit (cap) a particular customer's data rate to a
cable operator selected value.
* DOCSIS 1.1 provides improved operational flexibility, security,
and quality-of-service (QoS) features.
* DOCSIS 2.0 includes increased upstream reliability and throughput
for symmetric services.
* DOCSIS 3.0 provides a number of enhancements, most notably,
channel bonding, support for IPv6,and support for IPTV. Channel
bonding provides cable operators with a flexible way to
significantly increase downstream speeds to a minimum of 160 Mbps,
and upstream throughput up to a minimum rate of 120 Mbps to customers.
* DOCSIS 1.0 cable modems made the interoperability of cable
technology a reality for cable operators and cable subscribers.
* DOCSIS 1.0 made the standardization of cable modems possible. As a
result, placed downward pressure on cable modem prices causing
them to drop from $500 to $50.
* DOCSIS 1.1 enables the cable operator to configure guarantees on
the data rates and/or the latency of the service.
* DOCSIS 2.0 increases upstream throughput to 30 Mbps of capability.
* DOCSIS 3.0 will allows cable operators to provide data rates in
the hundreds of megabits and potentially gigabits per second.
and, there's more of course. Google for docsis 3.0 and read for yourself.
What I saw demonstrated at The National Cable show in the CableTech
booth (that I supervised the building thereof) was streaming HDTV.
140+mbps download speeds.
The reason Europeans have faster download speeds than we do here in the
US, is that there's more competition there, than what the FCC allows here.
In EU, 10mbps is 'common' and 12 and 14mbps are quicker, "purchasable"
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