better facilitates asymmetric
services, whereas Band Plan 997 accommodates
symmetric services. VDSL1 supports
a bandwidth of up to 12MHz; in
VDSL2 this can be extended to 30MHz. To
be spectrally compatible with VDSL1,
VDSL2 uses the same band plans below
12MHz. VDSL2 can employ up to 4,096
subcarriers.