VMS Help LANCP, SET, DEVICE parameters, Qualifiers, /MEDIA  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MEDIA=value

    o  For Token Ring devices:

       Selects the type of cable media used to connect the adapter
       to the Token Ring Media Access Unit (MAU) for devices that do
       not automatically detect this. Acceptable values for this are
       either unshielded twisted pair (UTP) or shielded twisted pair
       (STP). The default value is STP.

    o  For Ethernet devices:

       Selects the cable connection. Normally, the selection is made
       during device initialization using a limited autosensing
       algorithm that selects twisted pair, but fails over to AUI
       (Attachment Unit Interface) if twisted pair does not appear
       to be functional. Thereafter, a cabling change would require a
       reboot of the system to take effect. This command allows you
       to change the selection without rebooting.

       Acceptable values are AUI (10Base2, 10Base5), TWISTEDPAIR
       (10BaseT), and AUTOSENSE (reperform the limited autosense
       algorithm). The default value is AUTOSENSE.

       Some devices, such as the DE435, require a jumper change
       on the Ethernet card to switch between 10Base2 and 10Base5
       (thinwire and thickwire). Other devices, such as the DE434,
       DE436, and DE500, have only twisted pair connections.