一种通常可移动的互连设备，改变它的连线可以控制计算设备的操作。它用在穿孔卡片机中，在用户控制下完成一些操作。对于计算机，主要用来控制输入输出操作。

• An interconnection device, usually removable, that employs removable wires to control the operation of computing equipment.It is used on punch - card machines to carry out functions that are under control of the user.On computers it is used primarily to control input / output functions.