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本文简介数字用户环路技术在国外和国内的发展与应用,并侧重SLC—系统特点的描述和有关的技术经济比较;概述二线式传输中的时间压缩复用法与回波抵消法的原理及两种方法优缺点的比较;讨论用户光纤网中的部件技术,波分复用技术及其范例,光功率分用和无光源用户的接入方式,以及用户光纤网今后在国外和国内的发展进程,并结合国内当前市话网大发展中的问题,进行了分析和小结。
This article introduces the development and application of digital subscriber loop technology both in foreign countries and in China, and focuses on the description of SLC-system features and related technical and economic comparisons. It also summarizes the principles of time-division multiplexing and echo cancellation in two-wire transmission and Comparison of the advantages and disadvantages of the two methods; Discuss the component technology, the WDM technology and its examples, the optical power distribution and the access mode of the non-light users in the user optical network, as well as the future development of the user optical network in foreign and domestic Process, combined with the current development of the domestic local telephone network problems, conducted an analysis and summary.