Contention/Oversubscription maths
Adam Armstrong
lists at memetic.org
Fri May 27 12:14:19 UTC 2011
On 27/05/2011 03:12, Valdis.Kletnieks at vt.edu wrote:
> On Thu, 26 May 2011 23:48:48 BST, Adam Armstrong said:
>
>> Finally, what do people think of selling a 1G service with 1G backhaul
>> (and potentially 10s or 100s of customers buying this service alongside
>> n*100s of customers with 100M service)?
> Depends what weasel words you put in your SLA, I suppose. Can they
> claim SLA credits for it being down/unusable if they're only getting 1% of
> the throughput they paid for? And are they a captive audience or not?
No SLA, residential customers.
1% is quite unlikely to happen, it would require every customer in a
very large deployment to be trying to download >1mbit/sec at the same time.
Peak average usage for most UK broadband installations seem to be
between 20 and 100Kb/sec. I'm working on the basis of 300Kb/sec because
our access speeds are much higher.
(this would suggest 300Mbit/sec peak for 1000 users, but my question is
whether we'll see that level of aggregation at 1000 * 100Mb on 1GE, or
whether it's going to be very 'peaky', and we'll only see that
smoothness when we aggregate 10-15 buildings onto 10GE)
> What do you do on Patch Tuesday?
Update windows.
adam.
More information about the NANOG
mailing list