William H. Magill on 9 Dec 2004 14:28:02 -0000


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Re: [PLUG] [OT] Fiber in PA



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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