Sony PCV-E518DS - Manual (Page 65)

System Board 57
USB Connectors
There are two USB ports that permit connection of two USB peripheral
devices directly to the system without having to use an external hub.
USB2 is a standard USB connector accessible from the rear panel. USB1 is
a standard USB connector accessible from the right side of the front panel.
An internal cable connects USB1 to a 4-pin header connector (J8) on the
system board.
If more USB devices are needed, connect an external hub to either USB1
or USB2.
J8 (connects to USB1 on front panel)
Pin
Signal Name
1 USBV1
2 USBP1+
3 USBP1–
4 USBGND
KY0033.VSD
USB2
J8
(connects to USB1
on front panel)