nanog mailing list archives

Re: broadband clarification


From: "Christopher B. Zydel" <czydel () cv net>
Date: Thu, 5 Jul 2001 17:41:56 -0400


A cable modem is a modem.  All signalling between a cable modem and a CMTS
is done over an analog carrier using QAM and QPSK modulation schemes.

On Thu, Jul 05, 2001 at 02:34:52PM -0700, Larry Diffey wrote:
Alright, for all of you who decided to lecture me on the definition of broadband and it's meaning in strict 
engineering terms, allow me to clarify (especially for the snotty ones).

First off, words can have more than one meaning and that meaning should be taken in context.  For example; I'm sure 
that none of you really think that a cable modem is a modem since it doesn't do AD/DA conversion but we all 
understand that it's simply a device used to connect a customer to a provider.  After all "cable modem" is nothing 
more than a marketing term so that customers have a rough understanding of what the device does (not that they always 
understand that either).

When I chose to use the term broadband as a reference point for my survey, I mistakenly thought that your brains 
would parse that out to mean "an minimum acceptable level of bandwidth for consumer internet traffic".  If you 
consider that to be current DSL/Cable speeds fine.  If you take that to mean some future technology using quantum 
mechanics fine.

So, if you're going to lecture me on the definition of bandwidth then please stop using the term modem unless you're 
talking about an actual modem device.


The question then remains: What (in your opinion) constitutes broadband according to the services that have been 
promised to consumers but not yet delivered?

Yes, I understand that it's not just speed, but take everything else into account when  you consider the minimum 
speed.

Feel free to be immature enough to flame me for my lecture.


Larry Diffey


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