This bitmap indicates the DWDM channel frequencies supported
by the tunable laser on this interface.
Bit zero of octet one corresponds to the lowest channel
(representing the frequency identified by
coIfXcvrMinLaserFrequency), bit one of octet one corresponds
to the lowest plus one channel (representing the frequency
obtained by adding the values of coIfXcvrMinLaserFrequency
and coIfXcvrMinLaserFrequencySpacing), and so on.
The frequencies supported by the tunable laser have the
corresponding bit set to one in the bitmap. Bits that are set
to zero represent frequencies that are not supported by the
tunable laser. The frequencies that are not represented in the
bitmap are also not supported by the tunable laser.