Sun Microsystems Enterprise 250 Owner's Manual page 199

2. Plug the MII Ethernet transceiver into the MII Ethernet connector on the system
rear panel.
3. Attach the network AUI cable to the AUI connector on the MII-to-AUI transceiver.
4. Lock the AUI connector.
As viewed from the top, slide the latch to the right to lock the AUI cable to the
MII-to-AUI transceiver. Use a flat-blade screwdriver, if necessary.
5. Connect the other end of the cable to the appropriate network device.
There are a variety of connector and cabling options available for the AUI
connection. See your network administrator if you need more information about
how to connect to your network.
Note – You can use only one of the main logic board Ethernet ports. You cannot
connect to the main logic board's TPE and MII ports at the same time. For
information about connecting to the TPE port, see "How to Attach a Twisted-Pair
Ethernet (TPE) Cable" on page 178.
Chapter 9 Administration and Networking 181