Capacity planning , transit vs last mile

Thu Mar 31 11:45:09 UTC 2016

Like. Good question.
There are a lot of papers on traffic model, but it is still an open issue...

takashi.tome

2016-03-31 3:51 GMT-03:00 Jean-Francois Mezei <jfmezei_nanog at vaxination.ca>:

>
> Canada is to hold a 3 week long hearing on discussing whether the
> internet is important and whether the farcical 5/1 speed promoted by the
> government is adequate.
>
> In this day and age, it would be easy to just set FTTP as target
> technology and be done with it, but too many want to have a policy that
> is technologically neutral.
>
> To this end, I will not only be proposing that subsidized deployments
> not only meet advertised service speed standards, but also a capacity
> per end user metric for the last mile technology  as well as for the
> backhaul/transit.
>
> (One of the often subsidized companies deploys fixed wireless which
> delivers the advertised speed for the first week, but routinely gets
> oversubscribed after a while and customers feel like on dialup.)
>
>
> I know that for sufficiently large ISPs, they currently provision just
> over 1mbps of transit capacity per end user (so 800-1000 customers per
> 1gbps of transit). The number rises by over 30% a year as usage grows.
> (The CRTC can get exact figure from telecom operators and generate
> aggregate industry-wide growth in traffic to do yearly standard
> adjustment).
>
> QUESTION:
>
> Say the policy is 1mbps per customer if 1000 customer or more.  Is there
> some formula (approx or precise) to calculate how that 1mbps changes for
> smaller samples ? (like 500 customers, 200 ? )
>
>
>
> And on the last mile portion where one has typically few users on each
> shared capacity segment (fixed wireless, FTTP, cable), are there fairly
> standard oversubscription ratios based on average service speed that is
> sold in that neighbourhood ? (for instance if I have 100 customers with
> average subscibed speed of 15mbps, how much capacity should the antenna
> serving those customers have ?
>
>
> I realise that each ISP guards its oversubscription ratios as very
> proprietary, but aren't there generic industry-wide recommendations ? My
> goal is to have some basic standards that prevent gross over
> subscription that result in unusable service.
>
> As well, I want that a company pitching a broadband deployment be able
> to demonstrate that the technology being deployed will last X years
> because it has sufficient capacity to handle the number  of customers as
> well as the predicted growth in usage each year.
>
>
> Any help ? comments on whether this is crazy ? sanity check ?
>
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