[35609] in North American Network Operators' Group
DSL backhaul provisioning
daemon@ATHENA.MIT.EDU (William Allen Simpson)
Tue Mar 13 22:46:53 2001
Message-ID: <3AAECDEE.60AFE52F@greendragon.com>
Date: Tue, 13 Mar 2001 20:49:10 -0500
From: William Allen Simpson <wsimpson@greendragon.com>
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Getting to something more operational, we've been deploying DSL here
and there in onesies and twosies (well, even a dozen) alongside the
dialup POPs, and not bothering a lot about adding more capacity.
I've been keeping the number of modems to about 8 customers per modem,
and 200 modems per T1 (roughly 8 per 56K channel), just as a rule of
thumb. In our experience, this keeps the dialin lines busy at no more
than 20 minutes per day at peak, and the T1s average 70% utilization at
peak. Customers seem reasonably happy.
We just got a bid on DSL service saying they provision at 200 DSL per
T1. That seems awfully high to me, since DSL potentially runs a lot
more traffic than 56Kbps modems. I was planning at 24 per T1.
Who's right? We don't have enough aggregate experience with DSL, even
though we've been offering it for about a year now. Individually, the
chicken plant (our first installation), car parts factory, jeans
factory, bookstores, etc, don't give a very consistent usage pattern.
Any of the bigger folks have a rule of thumb?
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