WAN - what is BVDSL
BVDSL or Bonded VDSL is a technique used to combine two copper wire pairs in a VDSL link to increase the capacity or to extend the copper network's reach for WAN connections. This results in higher data rates for the customers over longer local loops.
Links:
https://forum.networklessons.com/t/bvdsl-dialer-configuration-on-a-router/15956/2?u=lagapides