DSL backhaul provisioning

Wed Mar 14 01:49:10 UTC 2001

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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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