Dell Precision T7400 Quick Reference Guide - Page 21
Back Panel Connectors - sound card
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Back Panel Connectors 1 2 3 4 56 7 8 11 10 9 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" in your User's Guide. 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 headphones and most speakers with integrated amplifiers. On computers with a sound card, use the connector on the card. Quick Reference Guide 21