A metal bridge that closes an electrical circuit. Typically, a jumper consists of a plastic plug that fits over a pair of protruding pins. Jumpers are sometimes used to configureexpansion boards. By placing a jumper plug over a different set of pins, you can change a board's parameters.
Ontrack JumperViewer A graphical, interactive Java applet that allows you to select a hard drive and configuration, and instantly displays an image of the appropriate jumper settings.