XX广电宽带网络技术建议书XXXXX宽带网络系统技术建议书目录TOC\o"1-4"\h\zHYPERLINK\l"_Toc524238168"前言PAGEREF_Toc524238168\h4HYPERLINK\l"_Toc524238169"第1章公司简介PAGEREF_Toc524238169\h5HYPERLINK\l"_Toc524238170"第2章需求分析和设计目标PAGEREF_Toc524238170\h6HYPERLINK\l"_Toc524238171"2.1项目需求分析PAGEREF_Toc524238171\h6HYPERLINK\l"_Toc524238172"2.2设计目标PAGEREF_Toc524238172\h7HYPERLINK\l"_Toc524238173"第3章关于主干技术选型的建议PAGEREF_Toc524238173\h8HYPERLINK\l"_Toc524238174"3.1各种宽带技术PAGEREF_Toc524238174\h8HYPERLINK\l"_Toc524238175"3.2千兆以太网(GIGABITETHERNET，GE)PAGEREF_Toc524238175\h9HYPERLINK\l"_Toc524238176"3.3GE与其他宽带技术的比较PAGEREF_Toc524238176\h10HYPERLINK\l"_Toc524238177"3.4主干设备PAGEREF_Toc524238177\h12HYPERLINK\l"_Toc524238178"3.4.1交换结构（SwitchingFabric）PAGEREF_Toc524238178\h12HYPERLINK\l"_Toc524238179"3.4.2阻塞与非阻塞配置PAGEREF_Toc524238179\h13HYPERLINK\l"_Toc524238180"3.4.3采用何种方式实现第3层处理PAGEREF_Toc524238180\h13HYPERLINK\l"_Toc524238181"3.4.4系统容量PAGEREF_Toc524238181\h14HYPERLINK\l"_Toc524238182"3.4.5关键部件冗余设计PAGEREF_Toc524238182\h15HYPERLINK\l"_Toc524238183"3.4.6缓冲技术PAGEREF_Toc524238183\h15HYPERLINK\l"_Toc524238184"3.4.7系统结构的技术寿命PAGEREF_Toc524238184\h16HYPERLINK\l"_Toc524238185"3.5选型结论PAGEREF_Toc524238185\h16HYPERLINK\l"_Toc524238186"第4章设计方案总体描述PAGEREF_Toc524238186\h17HYPERLINK\l"_Toc524238187"4.1设计原则PAGEREF_Toc524238187\h17HYPERLINK\l"_Toc524238188"4.2“自顶向下”的设计思想PAGEREF_Toc524238188\h19HYPERLINK\l"_Toc524238189"4.3层次化的物理层拓扑结构设计PAGEREF_Toc524238189\h20HYPERLINK\l"_Toc524238190"4.3.1层次化网络设计的指导原则PAGEREF_Toc524238190\h21HYPERLINK\l"_Toc524238191"4.3.2核心层PAGEREF_Toc524238191\h21HYPERLINK\l"_Toc524238192"4.3.3分布层和访问层PAGEREF_Toc524238192\h23HYPERLINK\l"_Toc524238193"4.3.4冗余设计PAGEREF_Toc524238193\h24HYPERLINK\l"_Toc524238194"4.3.4.1产品结构上的冗余PAGEREF_Toc524238194\h24HYPERLINK\l"_Toc524238195"4.3.4.2网络的冗余设计P