Capacity planning , transit vs last mile

Thu Mar 31 23:38:31 UTC 2016

You will find that total data download per month is unrelated to service
speed except for very slow service.

If you have too few users the pattern becomes chaotic.
Den 31/03/2016 08.52 skrev "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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