Types of Transmission Medium
Transmission media are actually located below the physical layer and are directly controlled by the physical layer. The following figure shows the position of transmission media in relation to the physical layer.
A transmission medium can be broadly defined as anything that can carry information from a source to a destination.
In telecommunications, transmission media can be divided into two broad categories: guided and unguided.
Guided media include twisted-pair cable, coaxial cable, and fiber-optic cable.
Unguided medium is free space.
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