[c-nsp] Typical broadband aggregation rates

[Frank Bulk]

Our numbers are about 8 kbps/subscriber, insignificant of their broadband
speed, and it includes a mixture of residential and business.  For higher-ed
where the students/staff have 10/100 Mbps Ethernet connections I've seen
rates up to 15 or ever 20 kbps/computer.  I'm sure there are people on this
list that can offer exceptions, but I think you would be pretty safe
following these numbers.  

Oversubscription ratios worked for dial-up because it was demand-based
access and focused more on access to ports than bandwidth.  I don't this
oversubscription ratios work for broadband that well because they are
always-on connections and whether a residential customer is 1 Meg or 5 Meg,
they may consume almost the same amount of traffic.  

Leased-line customer aren't 1:1 -- there's definitely room for aggregation
there.  Some fill out their T1, others barely use it.  It just depends who
your customer base is and their usage patterns.  Even if an SLA prohibits
aggregation at the edge, it still has to happen somewhere...it's not like
the service provider carves out a piece of their transit or peering pipe for
leased-line customers.  It's aggregated at the core, to be sure.

Frank 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Justin Shore
Sent: Friday, May 11, 2007 3:22 PM
To: 'Cisco-nsp'; nanog at merit.edu
Subject: [c-nsp] Typical broadband aggregation rates

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



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