If the value of the unitsCounted attribute in moduleData component
is segments, this attribute counts the number of segments in invalid
frames received from the interface and discarded at the DLCI. If the
value of the unitsCounted attribute in moduleData component is
frames, this attribute counts the number of invalid frames received
from the interface and discarded at the DLCI. Segments of frames
are counted since the start of the interval period. The count is reset
to zero when an accounting record is generated. The count is a sum
of segments in frames or frames discarded due to the number of
octets in the information field greater than the subscribed maximum
or equal to 0, due to aBit turned off, or due to rate enforcement.