【正文】 ........... 21 二級(jí)主干光鏈路 ............................................................................................................ 21 接入光鏈路 ................................................................................................................... 22 光纜路由選擇 ............................................................................................................... 22 光纜設(shè)計(jì)原則 ......................................................................................................................... 23 一級(jí)主干光鏈路的設(shè)計(jì) ................................................................................................. 24 二級(jí)主干層光鏈路的設(shè)計(jì) .............................................................................................. 24 接入層光鏈路的設(shè)計(jì) ..................................................................................................... 25 光纜長(zhǎng)度設(shè)計(jì)計(jì)算 ................................................................................................................... 26 光鏈路損耗計(jì)算 ..................................................................................................................... 26 計(jì)算時(shí)相關(guān)參數(shù)取定： ................................................................................................. 27 光分路器的分光比 ........................................................................................................ 28 EPON 系統(tǒng)的設(shè)計(jì) ............................................................................................................................. 28 EPON 應(yīng)用的網(wǎng)絡(luò)結(jié)構(gòu) ............................................................................................................. 28 .............................................................................................................................. 29 .............................................................................................................................. 29 +EOC（ DPOE） ......................................................................................................... 29 系統(tǒng)組成與功能 ............................................................................................................... 29 ................................................................................................................................ 30 OLT 的上聯(lián) ............................................................................................................................. 30 單 PON 口承載用戶數(shù) ............................................................................................................... 30 EPON 系 統(tǒng)的適用埸景 ............................................................................................................. 31 OLT 的部署 ............................................................................................................................. 31 OLT 位置及覆蓋區(qū)域 ................................................................................................. 31 OLT 配置原則 ............................................................................................................... 31 4 EPON 系統(tǒng)的傳輸距離參考值： ............................................................................................... 32 系統(tǒng)技術(shù)指標(biāo) .......................................................................................................................... 33 下行通道主要指標(biāo)： ..................................................................................................... 33 下行模擬信號(hào)傳輸系統(tǒng)主要技術(shù)要求 (GY/T1061999).................................................... 34 基帶視頻技術(shù)指標(biāo) ........................................................................................................ 35 下行有線數(shù)字電視信號(hào)傳輸系統(tǒng)主要技術(shù)要求 .............................................................. 35 下行通路光鏈路主要技術(shù)要求 (GY50752020) ................................................................ 36 上行通道技術(shù)指標(biāo)要求 ................................................................................................. 36 網(wǎng)絡(luò)主要性能指標(biāo) (GY50752020) ................................................................................. 38 FTTH+HFC 接入 ........................................................................................................................ 39 技術(shù)實(shí)現(xiàn)方式 ............................................................................................................... 39 組網(wǎng)結(jié)構(gòu)示意圖 ............................................................................................................ 40 應(yīng)用場(chǎng)景 .................................................................................................................. 40 光分路器放置原則 ...................................................................................................... 40 ONU 及光站放置原則 ..................................................................................................... 40 入戶纜線 ..................................................................................................................... 41 EPON+LAN+單向光機(jī) +無源分配網(wǎng)絡(luò) ......................................................................................... 42 技術(shù)實(shí)現(xiàn)方式 ............................................................................................................... 42 組網(wǎng)結(jié)構(gòu)示意圖 ............................................................................................................ 43 應(yīng)用場(chǎng)景 ...................................................................................................................... 43 光分路器放置原則 ........................................................................................................ 44 ONU 及光站放置原則 ..................................................................................................... 45 入戶纜線 ...................................................................................................................... 45 EPON+EOC+單向光機(jī) +無源分配網(wǎng)絡(luò) ....................................................................................