Dell P1913 Monitor - Manual (Page 19)

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
2 downstream - back
NOTE: USB 2.0 functionality requires a USB 2.0-capable computer.
NOTE: The monitor's USB interface works only when the monitor is On or in the power save mode. If you turn Off the monitor and then turn it On, the attached peripherals may