Thanks for the reply, just being told it's not too bad helps. I understand most of the figures but where do you calculate I'm 3km from the exchange, i am as it happens but where does DMT confirm this.
Also, i read once that feeding the modem lead through a toroidal coil, which i have somewhere might help, but the number of turns is important.
Would a filtered faceplate help?
The extension wiring is CAT5 and the only thing plugged in is the DGN2000
Hammy