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1 引言当前,电信产业正以前所未有的速度高速发展,根据信息产业部2000年规划和2010年远景发展目标,2000年全国电话用户将达到1亿户.同时,高速数据通信、会议电视等宽带多媒体通信也呈迅速上升趋势,VOD、高清晰度电视也逐步发展起来,所有这些对用户接入网提出了更高的要求,而当
1 Introduction At present, the telecom industry is developing at an unprecedented speed. According to the 2000 plan of the Ministry of Information Industry and the long-term development goal of 2010, the number of telephone subscribers in the country will reach 100 million by the year 2000. Meanwhile, broadband multimedia such as high-speed data communications and conference television Communication also showed a rapid upward trend, VOD, high-definition television are also gradually developed, all of these user access networks put forward higher requirements, and when