Sony PCV-RX270DS - Manual (Page 65)

System Board 51
USB Connectors
There are two USB ports at the rear panel, and one USB port at the front
panel. Each permits connection of USB peripheral devices directly to the
system without having to use an external hub.
USB1 and USB2 are standard USB connectors accessible from the rear
panel. USB23 Header is a 12-pin header that connects to a standard USB
connector (USB1) accessible at the bottom of the front panel. An internal
cable connects USB23 Header to an interface board behind the front
panel.
If more USB devices are needed, connect an external hub to any USB
connector.
KY0033.VSD
USB1 USB2
USB23 header
12 11
10 9
8 7
6 5
4 3
2 1