Transmission media

• What is Transmission media in a computer network?

A system or material that can mediate the propagation of signals for telecommunications purposes is referred to as a transmission medium. Typically, signals are applied to a wave of some sort that is appropriate for the selected medium. For instance, data may modulate the sound, and while air is a common transmission channel for sounds, solids and liquids can also be used. A useful transmission medium for electromagnetic waves like light and radio waves is a vacuum or air. Although a physical substance is not necessary for the propagation of electromagnetic waves, these waves are typically impacted by the transmission medium they pass through, for example, by absorption, reflection, or refraction at the interfaces between media. Therefore, waves can be transmitted or guided using technical devices. As a result, transmission media like copper cables or optical fibers are employed.

Twisted pair wires, coaxial cables, dielectric-slab waveguides, and optical media like optical fiber can all be used to transfer electromagnetic radiation. Any physical substance, such as water, air, glass, or concrete, that is transparent to a particular wavelength may also allow it to pass through. Since sound is by definition the vibration of matter, it needs a physical medium to be transmitted, much like heat energy and other types of mechanical waves. Science has historically used several other ideas to describe the transmission medium. However, it is now understood that electromagnetic waves can go across the "vacuum" of free space since they do not need a physical transmission medium. areas where there is an insulative vacuum in the presence of free electrons, holes, or ions, can become conductive for electrical conduction.

 

Types of Transmission Media in Computer Networks