IBM 220 - Manual (Page 75)

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
4 Ground
Table 6. USB-port connector pin-number assignments
Pin I/O Signal
1 I/O Data
2 N/A Reserved
3 N/A Ground
4 N/A +5 V dc
5 I/O Clock
6 N/A Reserved
Table 7. Keyboard connector pin-number assignments
6
4
2 1
3
5