Sony PCV-RX480DS - Manual (Page 77)

System Board 63
USB Ports and USB Header
There are four USB ports: two USB ports at the rear panel, and two USB
ports 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 ports accessible from the rear panel.
An internal cable connects the 12-pin USB23 header to an interface board
behind the front panel. The interface board provides two standard USB
ports (USB3 and USB4) that are accessible from the bottom of the front
panel.
If more USB devices are needed, connect an external hub to any USB port.
USB1
USB2
USB23 header
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11 12