dvprogs at gmail.com
Wed May 21 10:21:20 CDT 2008
I had worked for some major ISPs in New York for a few years and was amazed
at their approaches to the network, and DOCSIS in particular. As a
mysterious linux geek told me at a local LUG meeting in NY, "things aren't
as they seem."
I have a funny story...
I once had an apartment on the Northside near work where it was usual to get
pizza flyers under the door often... I always threw them out. One day my
internet was out. I ended up calling up the ISP and another ISP had taken
over the internet in the complex and their idea of notifying me was, yup,
you guessed it, pizza-style flyers! I left that apartment at the end of my
lease and when they asked why I was leaving, I told them that they had all
my contact information and should have contacted me properly and that I
wasn't impressed with the way the transition for the internet switch went.
> Date: Tue, 20 May 2008 14:16:59 -0500
> From: Geoff <geofff at w5omr.shacknet.nu>
> Subject: [SATLUG] DOCSIS III
> I saw a demonstration of this technology at the National Cable show I
> was installing in New Orleans, last week.
> DOCSIS<R> — 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(R)) 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
> Strategies, Inc.)/
> 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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