An ATU-R (ADSL Terminal Unit - Remote), sometimes called an "ADSL
modem," is a hardware unit that is installed in any computer that
uses a telephone company connection with Asymmetric Digital Subscriber
Line (ADSL) service. The ATU-R connects to an Ethernet network interface
card (NIC) in the computer and, on the other side, to a telephone jack
in the home or business. Ideally (for less interference), the telephone
jack hooks up to a new wire that goes to a signal splitter that the telephone
company installs at the telephone company demarcation point (the place
where the outside phone company wire or wires connect to the network of
phone lines within the customer's building). The splitter divides the
signal into low frequencies for voice and high frequencies for data.
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