KVM Switch USB Server Interface Unit Virtual Media HD15 USB RJ45. The Tripp Lite NetCommander USB Server Interface Unit (SIU) connects to the HD15 port and USB port on a computer/server, and converts them to a single RJ45 connector. Ordinary Cat5e patch cables can then be used to connect the server to the switch ports on a Tripp Lite B070 / B072-Series NetCommander Cat5 KVM switch. Use of Cat5e cables frees up space in the installation that would ordinarily be filled by traditional, thicker KVM cables.