VDSL chipset Edit
A DsLam is a point to multipoint device that uses the VDSL chipset. For some applications we need a point-to-point device such a bridge.
Get the the VDSL chipset datasheet and let a telecoms engineer design a VDSL2+ bridge. http://www.versatek.com has a VDSL 10meg up/down bridge but no VDSL2+ bridges that would provide 50meg up/down.