Port numbers and traffic data

[Ian Batten]

On 28 Apr 2008, at 18:31, Andrew Bangs wrote:

> It's even easier to tune contention, especially for very low  
> contention products down to 1:1, on Datastream rather than IPStream.  
> The part of the solution that's different in order to allow this is  
> that with Datastream the ISP is buying capacity (an ATM VP) to an  
> individual DSLAM within an exchange rather than buying capacity (an  
> IPStream Central) into an amorphous cloud that doesn't relate  
> individual subscribers to individual exchanges. The ISP can then  
> choose to put multiple customers (as ATM VCs) into the VP in such a  
> way that the ratio of the sum of the sizes of the VCs to the size of  
> the VP is the contention ratio. (I simplified that a bit - it gets  
> complicated when you look at mixing customers of different  
> 'contentions' in the same VP.)

Ah.  It looks like I don't understand IP Central, because your  
description of Datastream is what I was envisioning.  Time to wander  
over to the desks of our traffic engineers and get them to explain it  
to me.

ian