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Plugboard, a component of certain encryption machines, unit record equipment and some early computers Telephone switchboard , another name for a manual exchange Power strip a device that plugs into a power socket to increase the number of power sockets available for other devices
Reverse side of the same 402 plugboard, showing the pins that make contact with the machine's internal wiring. The holes were called hubs. A plugboard or control panel (the term used depends on the application area) is an array of jacks or sockets (often called hubs) into which patch cords can be inserted to complete an electrical circuit.
In 1944, the Luftwaffe introduced a plugboard switch, called the Uhr (clock), a small box containing a switch with 40 positions. It replaced the standard plugs. After connecting the plugs, as determined in the daily key sheet, the operator turned the switch into one of the 40 positions, each producing a different combination of plug wiring.
The effect of rotation on the rotors can be demonstrated with some examples. As an example, let us take rotor type I of Enigma I (see table below) without any ring setting offset. It can be seen that an A is encoded as an E, a B encoded as a K, and a K is
Bare busbars are common, but many types are now manufactured with an insulating cover on the bars, leaving only connection points exposed. In a modern switchboard, the operator is protected from electrical injury by metal-enclosed circuit breakers, switches, and fuses. There may also be instruments and controls for the supply of electricity to ...
All but the earliest machines had high-speed mechanical feeders to process cards at rates from around 100 to 2,000 per minute, sensing punched holes with mechanical, electrical, or, later, optical sensors. The operation of many machines was directed by the use of a removable plugboard, control panel, or connection box.