Sony PCV-L400 - Manual (Page 58)

VAIO Computer Reference Manual 50
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. If
more USB devices are needed, connect an external hub to either USB1 or
USB2.
USB1 is a standard USB connector accessible from the rear panel. USB2 is
a standard USB connector accessible from the front panel.
USB1 connector (rear panel)
Pin
Signal Name
1 Power
2 USBP0#
3 USBP0
4 GND
USB2 connector (front panel)
Pin
Signal Name
1 Power
2 USBP1#
3 USBP1
4 GND
KY0033.VSD
USB1
USB2