Offering downstream bit rates in excess of 100 Mbps, Vectored VDSL2 uses state-of-art noise cancelation techniques to eliminate crosstalk between VDSL2 services operating from the same DSLAM in the same cable.
However, there also can be uncancelled crosstalk, i.e. crosstalk that vectoring is not able to cancel. If not properly managed, uncancelled crosstalk can void the benefits of Vectored VDSL2.
The following illustration shows how uncancelled crosstalk occurs.