Sorry, I failed to mention the power cut-back that is applied to all VDSL2 circuits.
There is a unique CAL (cabinet assigned loss) calculated for and assigned to each & every PCP - fibre cabinet pair. The purpose is to protect all exchange originating ADSL2(+) signals from being swamped out by all the signals originating from the VDSL2 DSLAM.
The power of the VDSL2 signals, across the frequencies in common with the ADSL2(+) bandwidth, are reduced, i.e. "cut back", proportional to the CAL. Hence that at the point where the D-side cables exit the PCP, all ADSL2(+) and VDSL2 signals are at an equal power level.