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How broadband works: Difference between revisions
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Mention the term 'baseband' (as opposed to broadband)
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==Frequency==
Normal telephone service is an analogue of sound waves. It carries sound using electrical signals that work in the same way as they do though air. In terms of frequency this means that telephone calls use very low frequency signals on the telephone line. This is called baseband.
The line itself can carry signals at a much higher frequency. The limiting factor is the quality and length of the cable used. Normal telephone lines are a copper pair (two insulated copper conductors twisted around each other) that can go for several miles from the local telephone exchange to your premises.
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