
ADSL can generally only be distributed over short distances from
the telephone exchange (the last mile), typically less than 4 kilometers
(2 mi),[2] but has been known to exceed 8 kilometers (5 mi) if the
originally laid wire gauge allows for further distribution.
At the telephone exchange the line
generally terminates at a digital subscriber line access multiplexer
(DSLAM) where another frequency splitter separates the voice band signal
for the conventional phone network. Data carried by the ADSL are
typically routed over the telephone company’s data network and
eventually reach a conventional Internet Protocol network.

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