These pathways, called communication channels, use two types of media: Transmission line -based telecommunications cable (e. twisted-pair, coaxial, and fiber-optic cable) and broadcast (e. In information theory, a channel refers to a theoretical. Transmission media refers to the physical or wireless communication channel used to carry data signals from one device to another within a computer network. It works on the principle of total internal reflection, allowing light to move through the fiber with very little loss. The process kicks. Why is fiber optics the best method for transmitting data long distances? How optical fibers are made from silica glass Learn how optical fibres are created out of a piece of silica glass in this video. This disadvantage of the two-wire transmission.