switch

switch definition - computer

(1) A mechanical or electronic device that directs the flow of electrical or optical signals from one side to the other. Switches with more than two ports, such as a LAN switch or PBX, are able to route traffic. See LAN switch, softswitch, PBX, data switch and transistor.

With regard to a simple on/off switch, remember... Open is "off." Closed is "on."

(2) In programming, a bit or byte used to keep track of something. Sometimes refers to a branch in a program.

(3) A modifier of a command. See DOS switch.


SWITCH.GIF


Mechanical and Semiconductor Switches

The semiconductor switch (transistor) performs the same function as an on/off light switch on the wall. Instead of being manually closed, the switch is electronically closed by pulsing the semiconductor material, which makes it conduct.




_NYELEC.JPG


A Manual Switch

This early switch panel from New York Electric Switchboard Company was used to manually open and close electric lines.






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