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A digital subscriber line is a family of systems used to communicate digital information over telephone lines. DSL is the originally digital subscriber loop. DSL, the most widely-installed DSL technology, is widely used for Internet networking in telecommunications marketing.
A wired telecommunications service can be provided concurrently on the same telephone line as DSL uses higher frequencies in data bands. A DSL filter in the consumer premises blocks all disturbance at high frequencies on any non-DSL outlet for voice and DSL networks to be used simultaneously.
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