Very-high-bit-rate digital subscriber line

Very-high-bit-rate digital subscriber line is a digital subscriber line technology providing data transmission faster than asymmetric digital subscriber line over a single flat untwisted or twisted pair of copper wires, and on coaxial cable using the frequency band from 25 kHz to 12 MHz. These rates mean that VDSL is capable of supporting applications such as high-definition television, as well as telephone services and general Internet access, over a single connection. VDSL is deployed over existing wiring used for analog telephone service and lower-speed DSL connections. This standard was approved by ITU in November 2001.
Second-generation systems use frequencies of up to 30 MHz to provide data rates exceeding 100 Mbit/s simultaneously in both the upstream and downstream directions. The maximum available bit rate is achieved at a range of about 300 meters; performance degrades as the loop attenuation increases.


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