As you send signals to the Internet, your modem will convert the binary output of your computer to an analog signal, encode it for the transmission rate the two modems have agreed to, and then transmit it over the subscriber line. The central office modem will convert your analog signals back to a 56 digital signal, and switch those signals through the network to your SP's site. The problem is called crosstalk . Whenever you have a group of metallic wires in close proximity, you face the problem of capacitive and inductive coupling. That is, the electrical signal from one wire can interfere with the signals of the other wires.
Crosstalk is less prevalent on download signals on a subscriber line.
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