TANAR_FULL_DUP
if ((fullduplex = (tanlpar & TANAR_FULL_DUP)
&& (tanar & TANAR_FULL_DUP))) {
|| ((tanlpar & TANAR_FULL_DUP)
&& (tanar & TANAR_FULL_DUP))) {
| TANAR_HALF_DUP | TANAR_FULL_DUP,