Recent Development in Digital Communication Systems in Japan

概要

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The sophisticated demands of modern society have generated a growing need for various kinds of communication services, such as data, video and mobile telephone, in parallel with conventional telephone services. However, demand for these new services is relatively light and unpredictable at this stage, when compared with conventional telephone traffic. Consequently, the optimum solution to this situation would seem to lie in an economical digital network, which can cope with the new services, while at the same time providing the economy required for conventional services. To realize such facilities, research on PCM integrated networks was initiated in Japan about 15 years ago. Conclusion drawn from early work suggested that the key to resolving the problem was directly linked to progress in component and materials research. Thus, progress in semi-Conductor technology, such as the advent of the IC, has brought us viable digital data networks. Now, rant progress in LSI and optical fiber technology promises to bring us economical integrated services digital networks. This paper provides insights into the background of digital communication progress in Japan. Areas covered include rent breakthroughs in components and materials; a brief history of digital network development, e.g. PCM, data and integrated; and some highlights of recent work, such as the PCM-400M and opticalfiber transmission systems.
一般社団法人情報処理学会の論文
1978-06-30