Dell S2740L User Manual page 17

Rate
High speed 480 Mbps
Full speed 12 Mbps
Low speed 1.5 Mbps
USB Upstream Connector
Pin Number 4-pin Side of the Connector
1
DMU
2 VCC
3
DPU
4
GND
USB Downstream Connector
Pin Number 4-Pin Side of the Signal Cable
1
VCC
2
DMD
3
DPD
4
GND
2.5 W (Max, each port)
2.5 W (Max, each port)
2.5 W (Max, each port)