Dell Precision 390 - Manual (Page 29)

Inside View
network.
4 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 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 an additional network connector card, use the
connectors on the card and on the back of the computer when setting up
multiple network connections (such as a separate intra- and extranet).
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.
5 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.
6 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.
7 line-in
connector Use the blue line-in connector to attach a record/playback device such as
a cassette player, CD player, or VCR.
8 USB 2.0
connectors
(2) Use the back USB connectors for devices that typically remain connected,
such as printers and keyboards.
It is recommended that you use the front USB connectors for devices that
you connect occasionally, such as flash memory keys or cameras, or for
bootable USB devices.
9 USB 2.0
connectors
(3) Use the back USB connectors for devices that typically remain connected,
such as printers and keyboards.
It is recommended that you use the front USB connectors for devices that
you connect occasionally, such as flash memory keys or cameras, or for
bootable USB devices.
10 serial
connector
Connect a serial device, such as a handheld device, to the serial port.
The default designations are COM1 for serial connector 1 and COM2 for
the optional serial connector 2.
For more information, see System Setup Options .
11 keyboard
connector
If you have a standard keyboard, plug it into the purple keyboard
connector. If you have a USB keyboard, plug it into a USB connector.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
1 power supply 2 system board 3 secondary hard drive bay