<P> Many transmission media are used as communications channel . </P> <P> For telecommunications purposes in the United States, Federal Standard 1037C, transmission media are classified as one of the following: </P> <Ul> <Li> Guided (or bounded)--waves are guided along a solid medium such as a transmission line . </Li> <Li> Wireless (or unguided)--transmission and reception are achieved by means of an antenna . </Li> </Ul> <Li> Guided (or bounded)--waves are guided along a solid medium such as a transmission line . </Li>

Guided and unguided transmission media in data communication
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