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微电子技术和计算机技术的迅速发展，加快了人类信息化时代的进程，也促进了通信网络技术的变革。尽管当前各国通信网发展水平与状况不尽相同，有的差异还很大，但总的来说，其发展的一般趋势可概括为“五化”，即数字化、综合化、宽带化、智能化和个人化。 １．通信技术数字化
The rapid development of microelectronic technology and computer technology has accelerated the progress of human information age and promoted the transformation of communication network technology. Although the development level and status of communication networks in various countries are not the same at present, some differences are still quite large. However, in general, the general trend of its development can be summed up as “five changes”: digitalization, integration, broadbandization and intelligence And personal. 1. Digital Communication Technology