This attribute determines whether data bits are to be inverted (1 to 0
and 0 to 1) before transmission of frames to the interface. If the
value of this attribute is On, the incoming data bits will also be
inverted when frames are received from the link before being
processed.
This option is typically used in hdlc framing mode when inversion
is used to guarantee 1's density.
Note that aborts (in hdlc and interrupting modes) are corrupted
when data is inverted.