How does ADSL work, and how can it be so much faster if it uses the same phone line as 56k connections?
Analogue modems send their signals through the same Telephone Network that connects ordinary telephones for voice data. ADSL modems transmit their signals on top of the voice signal. At the telephone company, the line is split. The voice calls are sent to the Public Switched Telephone Network, and the data transmission goes to the Internet through the network of the 6 Operators. This method moves data from the lines of the telephone company and instead uses connections designed for carrying Internet traffic.
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