The BE and HME Sbus 100base-TX network interface cards each have an 
MII connector, and an RJ-45 socket. So far as I know, only one of 
those, per card, may be selected as the interface that packets flow 
over at any given moment.

Neither of these cards has an AUI connector.

The BE is half-duplex only.

The HME can do full duplex.

 Erik <fair@clock.org>