Intel I945P - Manual (Page 29)

Installation
Page 3-13
CUSB3 CUSB4
CUSB3/CUSB4: Four USB 2.0 ports
This mainboard includes additional USB2.0 ports,
identified by 10-pin connector.
If you wish to use the additional USB ports, install
the card-edge bracket to the system chassis then
insert its cables to this 10-pin connector.
CAUTION !
If you purchased a separate USB cable make sure it has the same pin assignment. A
different pin assignment may damage the system. If you need the USB cable, please
contact our retailer.
CP80P: Post Port Debug LED
Provides two-digit POST code to show why the
system fail to boot. Allows quick and easy
optimization.
Post Port Debug 7-segment LED display
(Refer to Appendix B for POST codes)