On 04/07/2008 11:17, m wrote:

Clever having the AB leg at the rear - I guess this is a filtered A/B
leg rather than a direct connection to the BT A/B line.

No, it *IS* a direct connection to the A/B.

Phones/dial-up modems/faxes/skyboxes are be connected through the
filter, adsl modems/routers need to connect to the non-filtered line.