CAP in terms of
DSL stands for
Carrierless Amplitude and
Phase Modulation. It is one of the
methods used for
line encoding with
DSL service. It uses two
channels for communication. A
modem on a line that uses cap will have a
VPI/
VCI ID of 1/1.
This is all
transparent to the user of course, and the information is used only in
hardcore networking and
DSL line support.