Dell P2723D 27" 1440p Monitor - Manual (Page 23)

About your monitor │ 23
USB downstream connector
Pin
number
9-pin side of the
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.