The oldest and still widely used transmission media is copper wire, which is used for transmitting electrical signals in telecommunications, computer networking, and many other applications. Copper wire is relatively inexpensive and easy to work with, and it can support high bandwidths and long distances with the help of repeaters or signal boosters.
However, the maximum usable transmission media depends on the specific application and the distance that needs to be covered. In some cases, fiber optic cables may be the best choice because they can support higher bandwidths and longer distances than copper wire, without suffering from interference or signal degradation. Wireless transmission media such as radio waves and microwaves can also be used in some cases where wired connections are not feasible or practical.
