On 26/08/2013 20:22, Tim Streater wrote:
In article ,
(Andrew Gabriel) wrote:

In article ,
Tim Streater writes:
In article ,
The Natural Philosopher wrote:
How else can BT know where to vector the actual ATM conversation?
I would have expected that, with one end in my local exchange, the
other end on the ISP's router, BT would use their management
software to set up a VC between those points over their ATM network,
and that would be it as far as their involvement was concerned.
However, giggling for "BT Radius Server" appears to indicate that it
doesn't work like that; perhaps the simple approach doesn't scale.

It doesn't actually know who your ISP is until your router tries to
login.
If you reconfigure your router with the login details for another person
using a different ISP (but also on BT wholesale), you will find you can
login to their ISP on your line just like you normally log in to yours.

So the ATM circuit is built on the fly? That would make some sense.


Its done at the IP layer.
The customers ATM circuit does not get as far as the ISP on the ADSL
services.