Each SBus+ I/O board and Graphics+ I/O board has onboard connectors for 10BASE-T or 100BASE-T Ethernet. The two sockets (RJ-45 and 40-pin MII) connect to the same interface circuit, so that only one socket is active at any time.
Additional network interfaces can be added in the form of SBus cards. The SBus+ I/O board will support up to three SBus interface cards. The Graphics+ I/O board will support up to two SBus interface cards.