Does not make sense
I do not think the described rules apply in the UK, and they are not applying in TPG's FTTB.
There are mechanisms to 'shape' the spectrum, chnaging the amplitude in different frequency ranges. Since the VDSL and ADSL spectrum only overlaps for a maximum of 24Mbps worth of spectrum, the higher frequencies can be run at full amplitude. That leaves some 70Mbps+ that will not interfere.
Since some 50% of the ADSL spectrum is not usable by the time it reaches the node, there is no need to attenuate that part, and the 0-12Mbps part of the spectrum could be attenuated to match the long-distance exchange signals, and still provide better quality signal as well as less interference.
So really, most of the spectrum is usable without any greater impact on existing services.
Crosstalk is a function both of amplitude and distance. With the same amplitude as the already attenuated signal plus the reduced distance, the new FTTN will be less disruptive than the exchange signals.
Biting the hand that feeds IT
