If I've understood correctly, the cable BT use from pole to house tends to come in a form with 4 wires (ie 2 pairs). When a second line is ordered, it tends to use the other pair.
That cable goes back to a DP (Distribution Point) where the various pairs are jointed into a much larger capacity cable, which then goes back to the PCP, where it would be jointed (or jumpered) to the large-capacity cable to the exchange or to the tie-cable to the fibre cabinet.
I'm with you so far. I would need to check in daylight but I think that my current DP (the telegraph pole?) has two sets of cables running up its side from the PCP.
Hence, am just wondering what if each line is connected to a different cable back to the PCP - though as you say most of the route to the exchange will be the same - i.e. given the difference in speeds and the chances of less crosstalk in future..
I'm probably over thinking this but as this is a one off decision and the other line will be cancelled want to try and get this right in terms of futureproofing. It probably wouldn't bother me but I am 500m+ from the cab and right at the end of my local loop.. so that the checkers already assume I won't get the full 40mb let alone upto 80...
Even if its not, it seems like line 2 have better joints/jumpers for ADSL - I'm just wondering if that means its likely to do so for VDSL. Also, does anyone know what sort of impact vectoring will have on lines?
I don't know if anyone has yet ordered more than one VDSL line?