Re: [PLUG] [OT] Fiber in PA

["William H. Magill" <magill@mcgillsociety.org>]

On 07 Dec, 2004, at 19:55, Kevin Brosius wrote:

> That sounds strangely like the upper end of DSL (over copper, I'd
> guess.)  Low cost, and 768k up is the speed cap I've heard for every 
> DSL
> line I've tried to quote around here.

The 768K up link speed max is either a modem design problem or network 
design issue.

It is not an inherent limitation of ADSL.

The reason that virtually every ADSL network offers much higher 
download speeds than upload is because the amount of traffic involved 
is actually smaller!!!

Yes smaller. The game that is played here is the "caching server" game. 
The probably is that "download" materials will be found on the cachinge 
server, and therefore NOT have to traffic the network backbone to the 
Internet. Whereas ALL upload traffic will have to traffic the network 
backbone out to the Internet. ... at least, that is the theory.

Are there really twice as many hits on the caching server and therefore 
that much less of a load on the backbone between downloads and uploads? 
I don't believe that anyone has actually examined that part of the 
theory. I've never seen any published results.

The upload/download tradeoff was also viewed from the "consumer" point 
of view -- very few consumers are interested in uploading anything more 
than an occasional email message... while they want to download LOTS of 
stuff all the time.



T.T.F.N.
William H. Magill
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magill@mcgillsociety.org
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