jumper

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jumper

1. Engineering a boring tool that works by repeated impact, such as a steel bit in a hammer drill used in boring rock
2. Electronics a short length of wire used to make a connection, usually temporarily, between terminals or to bypass a component
3. a type of sled with a high crosspiece

jumper

[′jəm·pər]
(electricity)
A short length of conductor used to make a connection between two points or terminals in a circuit or to provide a path around a break in a circuit.

jumper

1. A short length of electric cable fitted with connectors at both ends, connected across a device in an electric circuit so that the current bypasses the device.
2. A steel bar which is moved up and down manually in a borehole in the ground; used as a drilling or boring tool.
3. In a stone wall, a stone that is two or more courses, 1 high.

jumper

(hardware)
A removable wire or small plug whose presence or absence is used to determine some aspect of hardware configuration.

jumper

A small, plastic-covered metal block that is pushed onto two pins to close a circuit. An alternative to the DIP switch, the jumper is a less costly on/off switch found on motherboards and peripheral devices for one-time configuration. Although jumpers exist on modern computers, especially on hard disk drives, they were more prevalent in the early days of personal computers. Configuration of the hardware via software eliminated the use of many jumpers. See DIP switch and jumperless.


Jumper
Jumpers are used to select options on printed circuit boards. The more sophisticated the board, the fewer the jumpers. Having no jumpers is best if changes have to be made by the user, otherwise the board has to be pulled out of the case.







Hard Drive Selection
Jumpers are used on IDE/ATA hard drives to select their operation mode, and schematics like this one are commonly found on the drive to show how to place the jumper on the pins. In "Single" mode, the jumper is not used.
References in periodicals archive ?
The procedures for attaching jumper wires are fairly extensive and would require more space than available in this column.
Jumper wires should be placed on the component side of the circuit board assembly when possible.
Jumper wires should be routed in an X-Y manner as directly as feasible, making as few bends as possible.
Jumper wires should not pass over pads or vias used as test points.
Jumper wires should not be routed under or over component leads or component bodies and contact with heat sinks must be avoided.
Note: Before connecting these thick wires to the two bottom screws, make sure the ends of the two jumper wires, that are also connected to these screws, are already wrapped around the screws.
While the resistor and the five jumper wires can be connected either way, the transistor and the LEDs must be connected so they are positioned as shown in Drawing 2.