[Gllug] ADSL moving delays

[Jason Clifford]

On Wed, 21 Mar 2007, paul at ma1.se wrote:

> Is that all the Centrals that Enta have? I'd got the impression, Enta 
> were pretty big.

A year ago Enta had a single 622Mb central. Now they have 3 with a 4th on 
the way in the coming weeks and a 5th on order. Each of those costs 
£1.5mllion per year.

Don't forget that most ISPs have collections of 155Mb pipes so they can 
claim to have more pipes even though they need 4 of each to match a single 
622Mb pipe.

Enta run at about 20k-25k users per 622Mb pipe which is slightly less than 
the industry average.

> Maybe Enta know a thing or two about traffic management. They have quite
> a few resellers to support.

The only traffic management they use is a loss management tool to handle 
periods of congestion (which generally include about 3 hours each night 
when everyone kicks off their big downloads in the offpeak period). All 
this does is to reduce everyone's speed if usage on a central pipe exceeds 
96% but it has a floor of 2Mb below which it does not reduce speeds. This 
is specific to the central that's busy so the others don't get touched.

This is not to dissuade people from using bandwidth intensive apps but 
rather to prevent packet loss and latency issues.

Jason
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