Dell OptiPlex 755 User Manual page 192

Back Panel Connectors
1 parallel Connect a parallel device, such as a printer, to the parallel connector. If
connector 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
Setup Options.
2 link integrity Green — A good connection exists between a 10-Mbps network
l
light and the computer.
Orange — A good connection exists between a 100-Mbps
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network and the computer.
Yellow — A good connection exists between a 1-Gbps (or 1000-
l
Mbps) network and the computer.
Off — The computer is not detecting a physical connection to the
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network.
3 network To attach your computer to a network or broadband device, connect
adapter one end of a network cable to either a network jack or your network or
connector broadband device. Connect the other end of the network cable to the
network adapter connector on the back panel of your computer. A click
indicates that the network cable has been securely attached.
NOTE: Do not plug a telephone cable into the network connector.
For VPro to work, the network cable must be connected to the onboard
NIC.
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 Flashes a yellow light when the computer is transmitting or receiving
light network data. A high volume of network traffic may make this light
appear to be in a steady "on" state.
5 line-out Use the green line-out connector to attach headphones and most
connector speakers with integrated amplifiers.
6 line- Use the blue and pink line-in/microphone connector to attach a
in/microphone record/playback device such as a cassette player, CD player, or VCR.; or
connector a personal computer microphone for voice or musical input into a sound
or telephony program.
7 USB 2.0 Use the back USB connectors for devices that typically remain
connectors (6) connected, such as printers and keyboards.
8 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.
9 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
serial connector 2.
For more information, see
Removing the Computer Cover
System
System Setup Options.