The Transmission medium reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Transmission medium

Transmission medium: Any material substance, such as fiber-optic cable, twisted-wire pair, coaxial cable, dielectric-slab waveguide, water, and air, that can be used for the propagation of signals, usually in the form of modulated radio, light, or acoustic waves, from one point to another.

Note: By extension, free space can also be considered a transmission medium for electromagnetic waves, although it is not a material medium.

Source: From Federal Standard 1037C

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