Dell P2423D User Manual page 23

USB downstream connector
Pin 9-pin side of the
number connector
1 VCC
2 D-
3 D+
4 GND
5 SSRX-
6 SSRX+
7 GND
8 SSTX-
9 SSTX+
NOTE: SuperSpeed USB 5 Gbps (USB 3.2 Gen1) functionality requires
a SuperSpeed USB 5 Gbps (USB 3.2 Gen1)-capable computer.
NOTE: The USB ports on the monitor work only when the monitor is
turned On or in power save mode. If you turn Off the monitor and then
turn it On, the attached peripherals may take a few seconds to resume
normal functionality.
About your monitor
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