Connector blocks and wiring units constituting most or all of the intercon- necting circuits of a system. For example, the printed-circuit modules of a personal microcomputer that make up the system are mounted by plugging into the backplane.

• 组成系统互连电路的大部分或全部的接插件和布线部件。例如，个人微机中组成系统的印刷电路模块就是插接在底板上。