Editing Jumper (computing) (section)

== Permanent parts of a circuit ==
Some printed wiring assemblies, particularly those using single-layer circuit boards, include short lengths of wire soldered between pairs of points. These wires are called ''wire bridges'' or jumpers, but unlike jumpers used for configuration settings, they are intended to permanently connect the points in question. They are used to solve layout issues of the printed wiring, providing connections that would otherwise require awkward (or in some cases, impossible) routing of the conductive traces. In some cases a [[zero-ohm link|resistor of 0 ohms]] is used instead of a wire, as these may be installed by the same robotic assembly machines that install real resistors and other components.

Jumpers setting configuration options not normally meant to be user-configurable can also be implemented as solder jumpers, typically two (or more) pads positioned closely together or even with interwoven shapes. Typically non-conductive by default they can be easily changed into a closed connection due to deliberately placed [[solder bridge]] on top of them. If the closed state is the default state, the PCB designer can superimpose a thin trace, which would be cut (with a knife) to open the jumper.