One final point, if you doing the ADSL setup yourself. The North American ADSL/HDSL systems are largely line powered. It takes a major effort to deliver 1W of DC to the far end of a long local loop
Thanks for the comments guys - as I would expect all seems OK with the "Engineer Installed". Does anyone have any experience of the "Wires only", which to me seems more likely to be a problem? No-one