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ADSL (asymmetric digital subscriber line) is a broadband high speed internet access service that uses the land line phone network and uses the phone frequency to its maximums limit to connect the client to the optimum speed used on the internet which is of course much faster than a fax modem that has a traditional speed 56 kbps (in fact the speed is between 10 and 40 more than dialup connection), And you're able to use the phone while you are connected to the net which means your land line won't be occupied ,and it is available 24 Hours . ADSL works on frequency differentiation? The frequency used by voice is different from that used by data, which is why you can use the phone and the Internet at the same time. In ADSL, the downstream speed (from the ISP to the user) is higher than the upstream speed, since when using the Internet or other information services there is always more data coming towards the user than there is going up from the user
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