Dell U2212HM Monitor - Manual (Page 18)

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
USB Ports
1 upstream - back
4 downstream - 2 at the back; 2 on the left side
NOTE: USB 2.0 functionality requires a USB 2.0-capable computer