IBM 8685 Hardware Maintenance Manual - Page 125

Universal Serial Bus ports, USB cables and hubs, USB-port connectors

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assignments conform to the industry standard. 1 5 6 9 Universal Serial Bus ports Your server has four Universal Serial Bus (USB) ports, which are configured automatically. USB is a serial interface standard for telephony and multimedia devices. It uses Plug and Play technology to determine the type of device that is attached to the connector. Notes: 1. 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). 2. If you install a USB keyboard that has a mouse port, the USB keyboard emulates a mouse, and you will not be able to disable the mouse settings in the Configuration/Setup Utility program. 3. Check to make sure that your NOS supports USB devices. 4. For additional information about USB devices, go to http://www.usb.org/. USB cables and hubs You need a 4-pin cable to connect devices to USB 1, or USB 2, USB 3, or USB 4. If you plan to attach more than four 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 MBps speed with a maximum of 127 external devices and a maximum signal distance of five meters (16 ft) per segment. Note: After installing a USB keyboard, you might need to use the Configuration/Setup Utility program (see "Starting the Configuration/Setup Utility program" on page 11) to Enable keyboardless operation and prevent the POST error message 301 from being displayed during startup. USB-port connectors Each USB port has an external connector on the rear of the server for attaching USB compatible devices. The following illustration shows the pin-number assignments for the USB ports on the rear of your server. 1 4 Table 14. USB-port connector pin-number assignments Pin Signal 1 VCC 2 -Data 3 +Data 4 Ground Chapter 4. Customer replaceable units 115

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assignments conform to the industry standard.
1
5
6
9
Universal Serial Bus ports
Your server has four Universal Serial Bus (USB) ports, which are configured
automatically. USB is a serial interface standard for telephony and multimedia
devices. It uses Plug and Play technology to determine the type of device that is
attached to the connector.
Notes:
1.
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).
2.
If you install a USB keyboard that has a mouse port, the USB keyboard
emulates a mouse, and you will not be able to disable the mouse settings in the
Configuration/Setup Utility program.
3.
Check to make sure that your NOS supports USB devices.
4.
For additional information about USB devices, go to http://www.usb.org/.
USB cables and hubs
You need a 4-pin cable to connect devices to USB 1, or USB 2, USB 3, or USB 4.
If you plan to attach more than four 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 MBps speed with a maximum of 127 external
devices and a maximum signal distance of five meters (16 ft) per segment.
Note:
After installing a USB keyboard, you might need to use the
Configuration/Setup Utility program (see “Starting the Configuration/Setup
Utility program” on page 11) to Enable keyboardless operation and prevent
the POST error message 301 from being displayed during startup.
USB-port connectors
Each USB port has an external connector on the rear of the server for attaching
USB compatible devices.
The following illustration shows the pin-number assignments for the USB ports on
the rear of your server.
1
4
Table 14. USB-port connector pin-number assignments
Pin
Signal
1
VCC
2
-Data
3
+Data
4
Ground
Chapter 4. Customer replaceable units
115