An entry provides a list of attributes for a single
downstream RF channel per WCMTS entity.
An entry in this table exists for each configured
RF channel on the WCMTS entity that provides the
wideband DOCSIS functionality. The index, entPhysicalIndex,
used here is the physical index of the wideband controller
card. Since RF channels are considered part of the Wideband
controller card, hence entPhysicalIndex is used for
associating RF channels.