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1.概述 随着接入网技术的迅速发展,越来越清楚的表明,许多国家的电话公司都确定将现有的对绞铜线环路纳入下一代宽带接入网中。HFC就是一种很适合于模拟和数字广播共同接入的介质。可同时传送语音电话,交互式图象和高速数据。目前,光纤到户(FTTH)仍然价格过高,在相当一个时期内难以商用。然而为了既要满足用户的宽带业务的需求,又要具有使用户可以接受的市场价格,一种最具吸引力的选择方案就是光纤到附近地方(FTTN),即光纤到路边
1. Overview With the rapid development of access network technology, it has become clearer and clearer that many telephone companies in the world have decided to include the existing twisted pair copper loop in the next generation broadband access network. HFC is a very suitable medium for analog and digital broadcast co-access. Simultaneous transmission of voice calls, interactive images and high-speed data. Currently, FTTH is still overpriced and has been difficult to commercialize for quite some time. However, in order to meet the needs of users of broadband services, but also have to allow users to accept the market price, one of the most attractive option is the fiber to the vicinity (FTTN), that is, fiber to the curb