最新城市光纤接入网的规划设计.doc

城市光纤接入网的规划设计
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several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
城市光纤接入网的规划设计〔乔元志〕
摘要 根据城市接入网的现状及近期用户需求，提出城市光纤接入网勘察的主要
内容。结合光纤接入网分层规划模型，对城市光纤接入网的主干层、分配层和引
人层的规划设计进行了探讨。
关键词 光纤接入网 网络规划 工程设计
1城市接入网的现状及存在的主要问题
〔1〕目前，城市中绝大多数用户采用铜线接人、模拟传输方式，存在的主要
问题是不能接入宽带业务、传输距离短、扩容能力差、占用管道资源过多、平安
可靠性低和维护困难。
〔2〕移动基站大多采用小芯数光缆或HDSL组成点对点系统，占用管道资源
过多，点对点传输系统平安可靠性低。
〔3〕城市中除少数几个重要用户外，光纤到大楼〔fTTB〕和光纤到小区〔F
TTZ〕的光节点很少，整个接入网光纤化程度较低且缺乏总体规划。
〔4〕城市现有管道的布局是以局为中心的星型结构，适合电线接入网结构，
但难以形成环型光接入网络，为此还需在某些路段新建管道。此外出局管道紧张、
管孔容量趋于饱和，已成为城市光／电缆扩容面临的重要矛盾。
2城市光接入网近期用户需求分析
根据作者的实际工作经验和体