[mythtv-users] Per-usage internet billing. WAS: Vote for Miro Integration into MythTV

[Peter Bowyer]

On 21/01/2008, Bill Williamson <bill at bbqninja.com> wrote:
> On 1/21/08, Chris Pinkham <cpinkham at bc2va.org> wrote:
> > * On Mon Jan 21, 2008 at 01:08:57PM +1100, Bill Williamson wrote:
> > > 2. It costs the provider no more to do 1.5mbit ADSL vs 256kbit ADSL.
> >
> > Actually, it does.  I'll use simple numbers to make the math easier.  Let's
> > call them 5 Mbit and 1 Mbit lines.
> >
> > Consider an ISP with a 100 Mbit uplink.  For simplicity sake, we'll say that
> > it costs them $100 a month.  That's $1 per 1 Mbit.  In a perfect world,
> > this ISP does not want to oversubscribe their service, so they decide to sell
> > only 100 Mbit of service.  That's (100) 1Mbit users or (20) 5Mbit users, or
> > some combination in the middle.   A 1 Mbit customer can use 1/100th of
> > the total uplink and a 5 Mbit customer can use 1/20th of the uplink.  So,
> > if they can sell only 20 of these 5 Mbit accounts before the pipe is full.  If
> > they sell only 1 Mbit accounts, then they can sell 100.
>
>
> You do know that there is not a single ISP in the world that does not
> oversubscribe, and typical oversubscription contention is 20 to 1,
> right?

That doesn't change the argument - just insert the words 'to maintain
a given contention ratio'. Chris's simplified example was for 1:1.

-- 
Peter Bowyer
Email: peter at bowyer.org