[nsp] broadbandwidth

Chris Moore - GMD chris.moore at gmd.com
Wed Feb 25 08:58:41 EST 2004

I've always expressed it as an oversubscription rate. As an example, 4 users
with 1.5mbps ADSL links sharing a single T1 trunk is "4-1". 

As you said, the answer is "it depends". It depends on what kind of
guarantees you want to give customers, how happy you want to keep them, etc.
I've seen 4-1 used and the trunk links never filled up and I've seen 20-1
tried where customers were getting peaved 'cause there connection would bog
down badly during peak periods. If I had it to do over again I'd probably
start with 8-1 and adjust as needed as experience dictates.


>Date: Tue, 24 Feb 2004 16:18:31 +0100
>From: Ray Davis <ray at carpe.net>
>Subject: [nsp] broadbandwidth
>To: cisco-nsp at puck.nether.net
>Message-ID: <200402241518.i1OFIVHV017202 at s1.hfm0.de.carpe.net>
>I realize the best answer to the following question is "it depends", but
>any numbers based on experience might be better than no clue at all.  :)
>I'm trying to guestimate how many ADSL users will "fit" into an Mbit
>of 95%ile bandwidth.  Can anyone say something like "we have about
>X ADSL users (maybe 70% private, 30% small business) running with 640k
>downstream lines and they typically peak around Y Mbits during the day"?
>Any wild guestimates will be welcome!

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