世界通信大发展世界信息通信发展迅速，革新不断，为适应社会的前进，正在大力建设信息基础设施，走向全球化通信。通信技术正从模拟时代迈向数字时代，从声音通信向着数据传输为主发展，并进一步向多媒体发展。通信是今日社会不可或缺的基础设施，现在和今后的通信系统必须满 The World’s Great Development of Communication With the rapid development and constant innovation of information and communication, the information and communication industry is making great efforts to build an information infrastructure and move towards globalization in response to the progress of the society. Communication technology is moving from the analog era to the digital era, from voice communications to data transmission as the main development, and further to multimedia development. Communication is an indispensable infrastructure in today’s society and communication systems must be full now and in the future