Contention Ratio

[Tom Parker]

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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[LEE Tet Yoon]

At 10:50 p.m. 22/03/2006, someone wrote:
>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?

I don't know what they mean by overloaded but it's possible they mean it's at capacity and there are no more Dslam ports available. If this does happen, no one on the Mt Eden exchange will be able to get ADSL unless someone disconnects. It happens in other countries especially when there is high demand. But I don't not how efficient Telecom is at preventing this and acting quickly when it happens.

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[Tom Parker]

Hello LEE

On 23/03/2006, you wrote:

> At 10:50 p.m. 22/03/2006, someone wrote:
>> 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?
>
> I don't know what they mean by overloaded but it's possible they mean it's
> at capacity and there are no more Dslam ports available. If this does
> happen, no one on the Mt Eden exchange will be able to get ADSL unless
> someone disconnects. It happens in other countries especially when there
> is high demand. But I don't not how efficient Telecom is at preventing
> this and acting quickly when it happens.

Well, I don't know how credible this is, or if it's confined just to orcon,
but it suggests someone has run out of bandwidth somewhere. Or could it be
an exchange full of leaches? The minimum here is about 1/8th the plan he's
on, maybe he should be pleased it's not 1/150th?

http://y3m.net/files/dslbw/

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[Jason Mitcheson]

FYI I got knocked off the Mt Eden exchange a week ago. It took 3
technicans and 4 calls to the Xtra call center to get them to believe
that it wasn't a wiring problem on my end. In the end someone had to
physically switch my port at the exchange.

I was on dialup for three weeks. Three weeks I tell you! It was torture.

On 3/24/06, LEE Tet Yoon <***@ihug.co.nz> wrote:
> At 10:50 p.m. 22/03/2006, someone wrote:
> >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?
>
> I don't know what they mean by overloaded but it's possible they mean it's at capacity and there are no more Dslam ports available. If this does happen, no one on the Mt Eden exchange will be able to get ADSL unless someone disconnects. It happens in other countries especially when there is high demand. But I don't not how efficient Telecom is at preventing this and acting quickly when it happens.
>
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> This message is part of the NZ ADSL mailing list.
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>

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[LEE Tet Yoon]

At 08:43 a.m. 4/04/2006, Jared Yates wrote:
>meh.... i always spend 3 weeks on dialup... 10 gigs does not go very far... and thats without really trying...
>i'm guessing once i get 'upgraded' to 3.5mbps, that i'll be at dialup speeds for 3 1/2 weeks :P

I agree :-) I've never been limited to 64k tho, well not since late 2004 when Telecom screwed up my account. Actually I think I did go over my 40gb peak limit once but can't remember if it was limited or not. It was only a day or two before the end of my data usage period.

Out of interest, is there any particular reason you only chose a 10gb data cap? Price?

Cheers

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