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Serial-port connector: The following table shows the pin-number assignments for
the 9-pin, male D-shell serial-port connector on the rear of your computer. These pin-
number assignments conform to the industry standard.
Table 15. Serial-port connectors pin-number assignments.
Universal Serial Bus ports
Your computer has two Universal Serial Bus (USB) ports, which configure
automatically. USB is an emerging serial interface standard for telephony and
multimedia devices. It uses Plug and Play technology to determine the type of device
attached to the connector.
Notes:
1.
2.
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.
98
Hardware Maintenance Manual: xSeries 330 Type 8674 and IntelliStation R Pro Type 6851
Pin
1
Data carrier detect
2
Receive data
3
Transmit data
4
Data terminal ready
5
Signal ground
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).
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.
1
6
9
Signal
6
7
8
9
5
Pin
Signal
Data set ready
Request to send
Clear to send
Ring indicator
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