Dell PowerEdge 4300 Installation And Troubleshooting Manual page 191

This appendix provides specific information about the jumpers on the system board. It
also provides some basic information on jumpers and switches and describes the
connectors and sockets on the various boards in the computer.
Jumpers and switches provide a convenient and reversible way of reconfiguring the
circuitry on a printed circuit board. When reconfiguring the system, you may need to
change jumper settings on the system board. You may also need to change jumper
and/or switch settings on expansion cards or drives.
Jumpers are small blocks on a circuit board with two or more pins emerging from
them.
Plastic plugs containing a wire fit down over the pins. The wire connects the pins and
creates a circuit.
To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the
pin(s) indicated.
Jumpers, Switches, and Connectors B-1