第二代超高速數位用戶迴路(VDSL2)是目前速度最快的數位用戶迴路技術，傳輸速率較高速數位用戶迴路(HDSL)與超高速數位用戶迴路(VDSL)為快，主要依據線路長短不同而改變，進行雙向等速的對稱式傳輸，可利用傳統電話線路提供下載與上行最高皆達100 Mbps的傳輸速率。VDSL2的缺點是傳輸速率與傳輸距離成反比，一般而言，約只能涵蓋1200公尺內的距離。本研究是建構在 Infineon PEB83000 及 ADM5120晶片組上的 VDSL2 數據機，操作頻段可達 30 MHz，利用其不同的 profile 配置方案，比較其上下行傳輸速率以及傳輸距離的差異，進而在所需要的傳輸距離中得到最佳的傳輸效能。

VDSL2 is the fastest xDSL technology at present. Its data rate is variable depending on the length of wire and generally higher than HDSL and VDSL. VDSL2 uses the original POTS hardware to provide up to 100 Mbps data rate in upstream and downstream. The disadvantage of VDSL2 is that the longer the transmission distance, the lower the data rate. Generally speaking, the transmission distance is typically less than 1200 meters. The VDSL2 modem in this research is based on Infineon chip set composed of PEB83000 and ADM5120 with an operating band up to 30 MHz. The data rate in the different profiles of chip set is compared to find the optimum performance for a certain transmission distance.

第一章 緒論
第二章 VDSL2 網路系統簡介
2.1 DSL 技術發展現況
2.2 VDSL2 網路架構與特性
2.2.1 VDSL2 網路應用參考模型
2.2.2 VDSL2 技術特性
2.2.3 DMT 與 QAM 調變技術比較
2.3 八種 VDSL2 頻段規劃
第三章 VDSL2 數據機系統介紹與特性改善
3.1 VDSL2 數據機硬體簡介
3.1.1 VDSL2 IC: PEB83000
3.1.2 網路處理器: ADM5120
3.1.3 電源
3.1.4 介面
3.2 VDSL2 數據機效能測試
3.2.1 LAN 端基本測試
3.2.2 傳輸距離與上下行速率
3.3 VDSL2 數據機特性改善
3.4 VDSL2 數據機改善數據比較
第四章 結論

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