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          RFoG+EFM

          針對目前廣電FTTH網絡建設,路通視信推出了RFoG+EFM(EdgeFreeMix)接入技術解決方案,融合國內外應用成熟RFoG技術,實現基于 DOCSIS技術的FTTH接入。其中的EFM的含義是EdgeFreeMix(邊緣自由混合器),意在解決接近多個波長光信號匯聚中的各種問題。使用專用光波控制技術,將光纖分組接入后進行二次激發達到有效避免OBI干擾的目的,同時還能解決回傳光中繼問題。

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          RFoG+EFM

                 針對目前廣電FTTH網絡建設,路通視信推出了RFoG+EFM(EdgeFreeMix)接入技術解決方案,融合國內外應用成熟RFoG技術,實現基于 DOCSIS技術的FTTH接入。其中的EFM的含義是EdgeFreeMix(邊緣自由混合器),意在解決接近多個波長光信號匯聚中的各種問題。使用專用光波控制技術,將光纖分組接入后進行二次激發達到有效避免OBI干擾的目的,同時還能解決回傳光中繼問題。

          網絡架構



           
          上圖為標準FTTH應用

           

           
          上圖為標準FTTB應用

           

           
          級聯應用

           
          方案特點

                       DOCSIS技術、RFoG技術都已在國內外得到了多年的大規模應用,技術先進、方案成熟,并可以實現樹形ODN網絡,與xPON網絡兼容;

               
                 直播、點播業務同一張網,采用DOCSIS技術,編碼技術和DVB一脈相承,是真正基于廣電的端到端解決方案,對DVB有良好的支持,同時還保護了原有的前端廣播傳輸設備;

               
                 CMTS/CMC現在的價格已下降到極具競爭力的水平,與原先不可同日而語;

               
                 基于射頻載波的QAM調制效率遠高于IP基帶調制;

               
                 隨著業務需求的增長,支持由DOCSIS 2.0、3.0平滑升級到DOCSIS 3.1,下行帶寬可以到達10GB(以后的規劃超過15GB),上行可以到達1GB(以后規劃超過3GB);

               
                 EFM具有光增益功能,允許現場或者遠程調整增益;

               
                 EFM通過分組接入二次激發可徹底消除OBI的影響;

               
                 EFM支持4/8/16/32路回傳光信號混合,并支持拓展至128/256甚至更多用戶數;

               
                 EFM作為透明的設備,不增加網絡延時,支持多級級聯,擴展用戶數;

               
          ●       支持超遠距離傳輸,無EPON網絡傳輸距離20Km限制,并且適用各種場景,尤其是別墅區,城鄉結合部等用戶分散的區域,較EPON FTTH方案更有優勢;

               
                 使用EFM技術,可選擇不使用激光器突發模式,即保留了RF PON架構,又降低用戶端成本和分前端反向接收成本;

             
            ●       EFM允許根據網絡需求,在1310、1550nm波段任意定制波長;

               
          ●       EFM從功能模型上看,也可以當做光中繼設備,在光分路器處提供1~3mW的回傳光功率;

               
                 EFM支持先發展FTTx,再逐步向FTTH平滑升級;

               
                 EFM支持帶內網管和帶外網管接口,允許擴展網管功能,支持零配置部署(DHCP+TFTP 標準模式)。
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