6ES7 321-1BL00-0AA0 千兆宽带”好在哪?
1、家庭宽带接入网长什么样?
PON 是英语 Passive Optical Network 的*字母缩写,译为无源光网络,“无源”指 ODN(光分配网络)不含有电源,无需供电,ODN 全部由光分路器 SplIT(http://www.maoyihang.com/sell/l_25/)ter(实际上为玻璃器件)组成。
图 1:PON 的体系结构
运营商在 PON 系统建设时,一般在用户数达几千上万户的一个社区,建设一个 PON 系统,部署一台 OLT、几百台光分路器 Splitter、一户一台 ONU(俗称光猫)。
图 2:PON 系统中的物理设备(http://www.maoyihang.com/sell/l_4/)
图 3:分路器 Splitter 及内部结构
PON 系统上下行数据传输在同一根光纤中的不同波长上,单芯“皮光纤”即可实现光纤入户,无需使用双纤芯的光缆。当前主流的 PON 系统包括 GPON 和 EPON,它们有相同的上下行波长,即中心波长为 1310nm 和 1490nm。而“千兆宽带”普遍采用新一代的是 10G-PON 系统,它的上下行波长在 1270nm 和 1577nm 左右[3]。因此,两代 PON 系统之间,可以通过波分复用器件共存在同一个 ODN 上,带宽升级不影响原有业务。正是由于这个原因,运营商在实现小区“千兆宽带”覆盖时,并不需要重新在小区地下管道和楼道弱电井施工,仅需更换 OLT 上的一两个 XG-PON 板卡,在几分钟的时间内即可实现“千兆宽带入小区”的建设施工。
6ES7 321-1BL00-0AA0140CPU43412A 你值得拥有!!!
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