The Media Sensing feature in Windows 2000, Windows XP and later is used to detect whether the network media are in a link state. With Media Sense feature, Windows senses a link state as UP or DOWN based on the link availability. When Windows detects a “down” state, it removes the bound protocols from that adapter until it is detected as “up” again.
Media Sensing feature is enabled by default in Windows except Windows Server 2003. However, in instances where you do not want Windows to sense link status (very unlikely) in which case, you can disable the Media Sensing feature from Windows Registry.