ADSL (Asymmetric Digital Subscriber Line) is a technology
for transmitting digital information at a high bandwidth on existing phone
lines to homes and businesses. Unlike regular dialup phone service, ADSL
provides continously-available, "always on" connection. ADSL
is asymmetric in that it uses most of the channel to transmit downstream
to the user and only a small part to receive information from the user.
ADSL simultaneously accommodates analog (voice) information on the same
line. ADSL is generally offered at downstream data rates from 512 Kbps
to about 6 Mbps. A form of ADSL, known as Universal ADSL or G.lite, has
been approved as a standard by the ITU-TS.
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