[c-nsp] Typical broadband aggregation rates

[Justin Shore]

What do most ISPs consider to be an acceptable (or feasible yet 
desirable) aggregation rate, particularly with broadband offerings?  I'm 
calculating this right now for our ISP.  Our current ADSL offering is 
very low due to carrier backhaul limitations (384/128) but we plan on 
raising this to a more reasonable level in the next few months as we 
roll out ADSL2+.  Our cable offering is 1.5/256.  We're contemplating 
2-5Mbps for base packages with both types of service.

What I'm trying to do is calculate the cost of providing a single 
average user with bandwidth for capacity and sales planning.  By my 
calculation we are at roughly 32:1 when only putting the broadband users 
into the equation.  I'm sure we should somehow factor in the 5% of the 
userbase that chews up 95% of the bandwidth.  Our dialup userbase, while 
nearly 1000 strong, doesn't consume enough to be of much concern at all. 
  Our leased line customers I'll probably count as 1:1.  Do many of you 
aggregate leased line customers (assuming an SLA doesn't prohibit it)?

Would anyone mind sharing what your agg rates and general speed 
offerings are or what you want to strive for?  Tips or guidance for how 
to make this calculation more accurate would be appreciated too.  I 
don't see a Cisco SRND for Service Providers?  Does anyone know of any 
other resources?

Thanks
  Justin