Dell C2722DE 27" 16:9 IPS Video Conferencing Monitor - Manual (Page 47)

Setting up the monitor | 47
Connecting the DP cable
DP
DP
Connecting the monitor for DP Multi-Stream Transport (MST)
function ( C2422HE/C2722DE only )
DP DP out
DP
DP
NOTE: Supports the DP MST feature. To make use of this feature, your PC
Graphics Card must be certified to at least DP1.2 with MST option.
NOTE: Remove the rubber plug when using DP out connector.