Dell Dimension C521 - Manual (Page 4)

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NOTE: 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.
3 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.
4 surround sound
connector Use the (black) surround sound connector to attach multichannel-
capable speakers.
On computers with a sound card, use the connector on the card.
5 line-in connector Use the (blue) line-in 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/headphone
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 microphone
connector Use the (pink) microphone connector to attach a personal
computer microphone for voice or musical input into a sound or
telephony program.
On computers with a sound card, use the connector on the card.
8 center/subwoofer
LFE connector Use the (orange) center/subwoofer connector to attach a center
speaker or a single subwoofer.
On computers with a sound card, use the connector on the card.
NOTE: The LFE (Low Frequency Effects) Audio channel, found in
digital surround sound audio schemes, carries only low frequency
information of 80 Hz and below. The LFE channel drives a
subwoofer to provide extremely low bass extension. Systems not
using subwoofers can shunt the LFE information to the main
speakers in the surround sound setup.
9 side surround
sound connector Use the (gray) side surround sound connector to attach
multichannel-capable speakers. The side-surround output provides
enhanced surround audio for computers with 7.1 speakers.
On computers with a sound card, use the connector on the card.
10 USB 2.0 connectors
(4) (rear quad)
Use the back, rear-quad USB connectors for devices that typically
remain connected, such as printers and keyboards.
NOTE: It is recommended that you use the front USB connectors
for devices that you connect occasionally, such as joysticks,
cameras, or bootable USB devices.
11 VGA video
connector
If your monitor has a VGA connector, plug it into the VGA connector
on the computer.
NOTE: If your computer has an add-in video card, connect your
monitor to the add-in card's video connector.