随着信息化时代的 临近，对通信的需求也 呈指数规律增长，发展 迅猛的各种新业务对通 信网的带宽和容量提出 了更高的要求，通信网 的两大主要部分──传 输和交换都面临不断地 发展和革新。 在这种情况下，一 方面为了解决电子交换 已接近电子速率极限的 电子瓶颈问题，研究 With the advent of the information age, the demand for communications has also grown exponentially. The rapid development of various new services has set higher demands on the bandwidth and capacity of communications networks. The two major components of communications networks, namely, transport and Exchange are faced with continuous development and innovation. In this case, on the one hand, in order to solve the electronic bottleneck problem that the electronic exchange has approached the electronic rate limit,