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USB cables and hubs
You need a 4-pin cable to connect devices to USB 1 or USB 2. If you plan to attach
more than two USB devices, you must use a hub to connect the devices. The hub
provides multiple connectors for attaching additional external USB devices.
USB technology provides up to 12 megabits-per-second (Mbps) speed with a
maximum of 127 external devices and a maximum signal distance of five meters (16
ft) per segment.
USB-port connectors
Each USB port has an external connector on the system board for attaching USB-
compatible devices.
The following table shows the pin-number assignments for the USB-port connectors
on the system board.
Keyboard port
There is one keyboard port on the system board.
Note: If you attach a standard (non-USB) keyboard to the keyboard connector, the
USB ports and devices will be disabled during the power-on self-test (POST).
The following table shows the pin-number assignments for the keyboard connector
on the system board.
Pin Signal
1+5 V dc
2-Data
3+Data
4Ground
Table 11. USB-port connector pin-number assignments.
Pin I/O Signal
1I/O Data
2N/AReserved
3N/AGround
4N/A+5 V dc
5I/O Clock
6N/AReserved
Table 12. Keyboard connector pin-number assignments .
6
4
2
1
3
5