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xDSL refers to the family of dsl technologies which include asymmetric (ADSL), high-bit rate (HDSL), single-line (SDSL), and very-high-data-rate (HDSL). Each type has advantages and disadvantges with differences in symetry, signal distance, and speed.
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デジタル加入者線 (Digital subscriber line)

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デジタル加入者線とはツイストペアケーブル通信線路で高速デジタルデータ通信を行う技術、もしくは電気通信役務を指す。 上りと下りの速度の異なるADSL、CDSL、VDSL、長距離向きのReach DSL、同じ速度のHDSL、SDSLなどがありxDSLとも総称する。 ウィキペディア
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Various digital subscriber line (xDSL) technologies are those methods used to implement high-speed data services (e.g., 2 Mbps Frame Relay) on a twisted ...