自从19世纪末电话通信出现以来,电话技术主要着眼于固定点(通常是两点)之间快速、有效和高质量的连接。完成这一艰巨任务,获取必要的技术成果,耗去了大半个世纪的时间。本文讨论形成目前电话交换系统结构的历史原因及电信工程师们对交换系统的考虑。然后研究新业务的推动力将如何改变交换系统的结构以及人们的看法。 Since the advent of telephony in the late 19th century, telephony has focused on fast, efficient and high-quality connections between fixed points (usually two points). It took more than half a century to accomplish this arduous task of obtaining the necessary technical achievements. This article discusses the historical reasons for the formation of the current telephone exchange system and the considerations of the telecommunications engineers on the switching system. Then research how the drive for new business will change the structure of the exchange system and what people think.