(The biggest advantage of ADSL is that it does not need to be set up for special purposes. It can use the most widely distributed telephone copper wire in the world as the transmission medium, and can obtain three information channels on a pair of copper twisted pair wires (telephone wires): one for A standard telephone channel, a medium-speed upstream channel with a rate of 640kbps to 1Mbps, and a high-speed downstream channel with a rate of 1Mbps to 8Mbps, and these three channels can work together.)
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