Jumpers, Switches, and Connectors 105
Jumpers, Switches, and Connectors
This section provides specific information about the system jumpers. It also provides some basic
information on jumpers and switches and describes the connectors on the various boards in the
system.
Jumpers—A General Explanation
Jumpers 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 circuit boards
or drives.
Jumpers
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. Figure A-1 shows an example of a jumper.
Figure A-1. Example Jumper
A jumper is referred to as open or unjumpered when the plug is pushed down over only one pin or
if there is no plug at all. When the plug is pushed down over two pins, the jumper is referred to as
jumpered. The jumper setting is often shown in text as two numbers, such as 1–2. The number 1 is
printed on the circuit board with a triangle so that you can identify each pin number based on the
location of pin 1.
Figure A-2 shows the location and default settings of the server-module jumper blocks. See
Table A-1 for the designations, default settings, and functions of the jumpers.
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