Dell UltraSharp UP2516D User Manual page 28

Connecting the DP (or mDP) cable
NOTE: Default is DP port. Select input source on monitor to switch to mDP.
Connecting the HDMI cable(Optional)
Connecting the monitor for DP Multi-Stream Transport (MST)
function
NOTE: Supports the DP MST feature. To make use of this feature, your PC
Graphics Card must be certified to DP1.2 with MST option.
NOTE: Remove the rubber plug when use DP out connector.
28 | Setting Up the Monitor