通信中交换的要领源于电话交换。从通信资源分配的角度来看，交换就是按照某种方式动态地分配传输线路资源的一种运作。当然，这也是一门技术，称之为交换技术。-Exchange of communication essentials from the telephone exchange. Allocation of resources from the communications point of view, the exchange is in some way in accordance with the dynamic distribution of resources of a transmission line operation. Of course, this is a technology, known as the switching technology.