Dell OptiPlex GX280 User Manual page 3

Documentation
for the voltage that most closely matches the AC power available in your location.
NOTICE:
AC power available in Japan is 100 V.
Also, ensure that your monitor and attached devices are electrically rated to operate with
the AC power available in your location.
3 back panel Plug serial, USB, and other devices into the appropriate connector.
connectors
4 card slots Access connectors for any installed PCI and PCI Express cards.
1 serial Connect a serial device, such as a handheld device, to the serial port. The
connector default designations are COM1 for serial connector 1 and COM2 for serial
connector 2.
For more information, see "System Setup Options."
2 link Green — A good connection exists between a 10-Mbps network and the
integrity computer.
light Orange — A good connection exists between a 100-Mbps network and
the computer.
Yellow — A good connection exists between a 1-Gbps (or 1000-Mbps)
network and the computer.
Off — The computer is not detecting a physical connection to the
network.
3 network To attach your computer to a network or broadband device, connect one end
adapter of a network cable to either a network jack or your network or broadband
connector device. Connect the other end of the network cable to the network adapter
connector on the back panel of your computer. A click indicates that the
network cable has been securely attached.
NOTE: Do not plug a telephone cable into the network connector.
On computers with a network connector card, use the connector on the card.
It is recommended that you use Category 5 wiring and connectors for your
network. If you must use Category 3 wiring, force the network speed to 10
Mbps to ensure reliable operation.
4 network Flashes a yellow light when the computer is transmitting or receiving network
activity data. A high volume of network traffic may make this light appear to be in a
light steady "on" state.
5 line-in Use the blue line-in connector (available on computers with integrated sound)
connector to attach a record/playback device such as a cassette player, CD player, or
VCR.
On computers with a sound card, use the connector on the card.
6 line-out Use the green line-out connector (available on computers with integrated
connector sound) to attach headphones and most speakers with integrated amplifiers.
On computers with a sound card, use the connector on the card.
7 microphone Use the pink microphone connector (available on computers with integrated
connector sound) to attach a personal computer microphone for voice or musical input
into a sound or telephony program.
On computers with a sound card, the microphone connector is on the card.
8 USB 2.0 Use the back USB connectors for devices that typically remain connected,
connectors such as printers and keyboards.
(6)
It is recommended that you use the front USB connectors for devices that you
connect occasionally, such as joysticks or cameras, or for bootable USB
http://support.dell.com/support/edocs/systems/opgx280/en/ug/smtabout.htm#1054449
The voltage selection switch must be set to the 115-V position even though the
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