Dell Precision T7400 (Late 2007) - Manual (Page 24)

24 About Your Computer
Back Panel Connectors
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" on page 75.
2 mouse connector Plug a standard PS/2 mouse into the green mouse connector.
Turn off the computer and any attached devices before you
connect a mouse to the computer. If you have a USB mouse,
plug it into a USB connector.
3 IEEE 1394
connector
Use the IEEE 1394 connector for high-speed data devices such
as digital video cameras and external storage devices.
4 line-in connector Use the blue line-in connector to attach a playback device
such as an MP3 player, CD drive, or VCR. On computers with a
sound card, use the connector on the card.
5 line-out connector Use the green line-out connector to attach most speakers with
integrated amplifiers.
On computers with a sound card, use the connector on the
card.
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