Dell OptiPlex 330 (Late 2007) - Manual (Page 73)

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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
This light flashes yellow 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 to attach headphones and most
speakers with integrated amplifiers.
On computers with a sound card, use the connector on the card.
6 microphone/line-in
connector
Use the blue line-in connector to attach a record/playback device such
as a cassette player, CD player, or VCR.
Use the pink microphone connector to attach a personal computer
microphone.
On computers with a sound card, use the connector on the card.
7 USB 2.0
connectors (6)
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 joysticks or cameras.
8 VGA video
connector
Connect the monitor's VGA cable to the VGA connector on the
computer.
On computers with a video card, use the connector on the card.
9 serial connector Connect a serial device, such as a handheld device, to the serial port.
The default designation is COM1 for serial connector 1.
For more information, see System Setup Options .