Transmission medium

A transmission medium is something (solid, liquid, gas, or plasma) that can transmit energy. For example, the transmission medium for sounds is usually air. But sound can also be transmitted through solids and liquids. A wire can transmit electrons in the form of electricity. There are advantages and disadvantages to every transmission medium.^[1] These can be things such as cost, bandwidth (or how much of something can be transmitted), the speed of the transmission and scope.

1. ↑ Gilbert Held, Ethernet Networks: Design, Implementation, Operation, Management (London; New York: Wiley, 2003), p. 22