Can anyone clarify where the contention ratio calculations are actually made
in the network design? I'm hearing a lot of nasty sounding numbers thrown
about, but I wonder what they actually mean.

Does telecom maintain a specified ratio on the link between their core
network and the isp, based on the customers that isp has signed up?

Does telecom maintain a specified ratio on the link between a each exchange
and their core network, based on the customers connected to that exchange?
Is this different to the per-isp ratio and is it published?

Are there any other places where a contention ratio is maintained?

Are the link speeds adjusted as each customer joins or leaves, or is the
ratio a worst case which when reached, the link is upgraded? In the latter
case, are the customer numbers small enough and the speed bumps big enough
that you would notice the upgrade cycle?

What is the lead time on upgrades when new hardware has to be installed?
I've heard that the Mt Eden exchange is overloaded, is that sort of thing
plausable?

If the contention ratio is maintained on a per-exchange basis, presumably if
you are unfortunate enough to be on an exchange full of leachers, your
performance will be poor regardless of which ISP you are with and what plan
you are on? Is there any partitioning by ISP or by plan? Do ISP's manage
this at their end by grouping people by exchange and prioritising light
users above heavy users?

Was any of this sort of thing covered in the UBS specification proposed by
the govt? In the UBS we currently have? In TelstraClear's determination?

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