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VDSL
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== Conceptual development == The concept of VDSL was first published in 1991 through a joint [[Bellcore]]-[[Stanford]] research study. The study searched for potential successors to the then-prevalent [[HDSL]] and relatively new [[ADSL]], which were both 1.5 Mbit/s. Specifically, it explored the feasibility of symmetric and asymmetric data rates exceeding 10 Mbit/s on short phone lines. VDSL2 standard is an enhancement to ITU T G.993.1 that supports asymmetric and symmetric transmission at a bidirectional net data rate up to 400 Mbit/s on twisted pairs using a bandwidth up to 35 MHz.
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