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一、为什么应该建一个 宽带IP网 目前我国各城市都在建设有线电视HFC网。一些城市HFC网光缆网布设已有一定规模。一个城市有数百个乃至数千个光节点。每个光节点小区户数在1000-2000户,有的甚至更少。目前由于同轴电缆网不是双向的,而改造为双向网的费用很高,用户数不够多时投资回收有困难,因此一时无法全面启动HFC双向因特网接入业务。但HFC网的光缆网部分
First, why should build a broadband IP network China’s cities are building cable HFC network. Some cities HFC network cable network layout has a certain scale. A city has hundreds or even thousands of light nodes. Each optical node cell number in the 1000-2000 households, and some even less. At present, coaxial cable networks are not bidirectional. However, the cost of rebuilding a bidirectional network is high. When the number of users is not enough, investment recovery is difficult. Therefore, it is impossible to fully start the two-way HFC network access service temporarily. But HFC network cable network part