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Chapter 5. Installing options 65
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 rear of the server for attaching USB-
compatible devices.
The following table shows the pin-number assignments for the USB-port connectors
on the rear of the server.
Keyboard port
There is one keyboard port on the rear of the server.
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 rear of the server.
Auxiliary-device (pointing device) port
The rear of the server has one auxiliary-device port that supports a mouse or other
pointing device.
Pin Signal
1+5 V dc
2-Data
3+Data
4Ground
Table 6. USB-port connector pin-number assignments
Pin I/O Signal
1I/O Data
2N/AReserved
3N/AGround
4 N/A +5 V dc
5I/O Clock
6N/AReserved
Table 7. Keyboard connector pin-number assignments
6
4
2
1
3
5