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==Overview==
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ADSL works by using spectrum above the band used by voice [[telephone call]]s.<ref>ANSI T1.413-1998 "Network and Customer Installation Interfaces – Asymmetric Digital Subscriber Line (ADSL) Metallic Interface." (American National Standards Institute 1998)</ref> With a [[DSL filter]], often called ''splitter'', the frequency bands are isolated, permitting a single telephone line to be used for both ADSL service and telephone calls at the same time. ADSL is generally only installed for short distances from the [[telephone exchange]] (the [[last mile]]), typically less than {{Convert|4|km|0}},<ref>Data and Computer Communications, William Stallings, {{ISBN|0-13-243310-9}}, {{ISBN|978-0-13-243310-5}}</ref> but has been known to exceed {{Convert|8|km|0}} if the originally laid [[wire gauge]] allows for further{{clarify|date=October 2016}} distribution.
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