Planet Technology VDSL2 VC-200M User Manual
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services.
Unlike its predecessor, which allowed choosing either DMT (Discrete Multitone) or
QAM (Quadrature Amplitude Modulation) technology, VDSL2 only uses the DMT
line code.
DMT is a method of separating a DSL signal so that the usable frequency range is
separated into multiple small frequency bands, or tone. It uses up to 4096 tones which
are spaced 4 kHz or 8 kHz apart. Each tone can be used for either downstream or
upstream.
However VDSL2 ROUTER provide 10 VDSL2 profiles: 8a, 8b, 12a, 12b, and 17a
frequency bands.
Table 1 list 8a, 8b, 21a, 12b, and 17a standard VDSL2 profile about the bandwidth,
tones, tone spacing, and line power.