Usb Cables And Hubs; Usb-Port Connectors; Keyboard Port - IBM xSeries 150 User Reference Manual

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 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 your server.
Table 5. USB-port connector pin-number assignments
1
2
3
4

Keyboard port

There is one keyboard port on the rear of your 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 your server.
Table 6. Keyboard connector pin-number assignments
Pin
1 I/O
2 N/A
3 N/A
4 N/A
5 I/O
6 N/A
Pin
VCC
-Data
+Data
Ground
6
4
1
2
I/O
Data
Reserved
Ground
+5 V dc
Keyboard clock
Reserved
Signal
5
3
Signal
Chapter 3. Installing Options
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