Dell OptiPlex 170L - Manual (Page 74)

Inside Your Computer
NOTE: Do not plug a telephone cable into the network connector.
On computers with a network connector card, use the connector on the
card.
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.
6 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.
7 line-in
connector
Use the blue line-in connector (available on computers with integrated
sound) 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.
8 line-out
connector
Use the green line-out connector (available on computers with
integrated sound) to attach headphones and most speakers with
integrated amplifiers.
On computers with a sound card, use the connector on the card.
9 microphone
connector
Use the pink microphone connector (available on computers with
integrated sound) to attach a personal computer microphone for voice
or musical input into a sound or telephony program.
On computers with a sound card, the microphone connector is on the
card.
10 USB 2.0
connectors (4)
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, or for
bootable USB devices.
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.
12 video
connector
Plug the cable from your VGA-compatible monitor into the blue
connector.
NOTE: If you purchased an optional graphics card, this connector will
be covered by a cap. Connect your monitor to the connector on the
graphics card. Do not remove the cap.
NOTE: If you are using a graphics card that supports dual monitors,
use the y-cable that came with your computer.
13 serial
connector
Connect a serial device, such as a handheld device, to the serial
connector.
CAUTION: Before you begin this procedure, follow the safety instructions in the Product Information Guide.
CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Be careful when opening the computer cover to ensure that you do not accidentally disconnect cables from the system board.