Modulation describes a range of techniques for encoding information on a carrier signal, typically a sine-wave signal. A device that performs modulation is known as a modulator.
When transmitting digitaldata, modulation normally involves shifting one or more properties of the carrier wave between a set of states, a process referred to as keying. This type of modulation includes:
"Data Encoding Techniques" (http://www.rhyshaden.com/encoding.htm) and "Specifications for Data Encoding" (http://www.wildpackets.com/compendium/FE/FE-Encod.html) discuss the various encoding techniques that have been used with various types of Ethernet.
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