一、概述微电子学的发展,促进了电信技术向更广阔的领域沿伸。电信技术的传播频段从长波、中波、超短波、微波发展到光波。传播媒介由明线、同轴电缆向光缆以及通信卫星过渡,通过这些媒介建立起全球通信网。利用电子计算机对信息的采集、处理、储存等多种功能,使通信网的信息传递更为有 I. Overview The development of microelectronics has promoted the extension of telecommunication technology to a wider area. The spread of telecommunications technology from long-wave band, medium-wave, ultra-shortwave, microwave development to light. The medium is governed by clear lines, coaxial cables to fiber-optic cables and communications satellites through which the global communications network is established. The use of electronic computers on the collection of information, processing, storage and other functions, the communication network information more