Dell OptiPlex GX280 - Manual (Page 244)

5 padlock ring Insert a padlock to lock the computer cover.
6 cover release
latch
Allows you to open the computer cover.
1 parallel
connector
Connect a parallel device, such as a printer, to the parallel connector. If you
have a USB printer, plug it into a USB connector.
NOTE: The integrated parallel connector is automatically disabled if the
computer detects an installed card containing a parallel connector configured
to the same address. For more information, see "System Setup Options."
2 link
integrity
light
Green — A good connection exists between a 10-Mbps network and the
computer.
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
adapter
connector
To attach your computer to a network or broadband device, connect one end
of a network cable to either a network jack or your network or broadband
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
activity
light
Flashes a yellow light when the computer is transmitting or receiving network
data. A high volume of network traffic may make this light appear to be in a
steady "on" state.
5 line-out
connector
Use the green line-out connector (available on computers with integrated
sound) to attach headphones and most speakers with integrated amplifiers.
On computers with a sound card, use the connector on the card.
6 line-in
connector
Use the blue line-in connector (available on computers with integrated sound)
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.
7 microphone
connector
Use the pink microphone connector (available on computers with integrated
sound) to attach a personal computer microphone for voice or musical input
into a sound or telephony program.