The lowest frequency represented in the bitmap specified in
coIfXcvrLaserFrequencyBitmap, i.e., the frequency represented
by bit 0 of octet 1 of coIfXcvrLaserFrequencyBitmap.
A value of zero signifies that the laser on this interface is
uncolored and that coIfXcvrLaserFrequencyBitmap does not
apply.