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Re: [nanog] Re: Microsoft offering xDSL access
From: Greg Simpson <gws () sweet com>
Date: Fri, 23 Jan 1998 16:30:19 -0500 (EST)

You can't shape to a model you can't develop, but if you're 
already established, with those 40 customers you can develop a 
bandwidth-distribution layout and rather simply predict trends..

If you are in a highly volatile market, which xDSL doesn't seem to be 
quite yet :), this would be impossible, but adding customers at a 
constant rate with no changing technology would imply a constant trend..

Of course, as soon as technology changes that is no longer valid :), 
but.. alter the model on a monthly basis? ..

I wonder if RX and TX equalize at some point? If you have enough static 
[customers] machines connected to be transmitting data at a steady level?
I'd be curious to see some numbers on that..


Nobody in their right mind would sell T1 to every customer and do 1000:1
overcommit of their transit links without some kind of bandwidth shaping.
Since that shaping is part of the engineering plan, the marketroids will
have to find some way to come clean about it in the advertising glossies.

We've got 40 T1 ADSL customers coming into a single 1.1Mb SMDS connection

And I'll bet they're all at different speeds as well, both TX and RX.
It sounds like you have to play it by ear, that coming up with some
mathematical model is *almost* impossible.


Martin Hannigan                       hannigan () xcom net
Director of Data Networks             V:617.500.0108
XCOM Technologies, INC.               F:617.500.0002
The Leading Carrier for ISP's         http://www.xcom.net

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