In fiber optics, TX and RX refer to the transmission and reception of data over a fiber optic cable. Cables physically connect these devices, enabling them to communicate within a network. In computer networking, it is very important to know the distinctions between the different. To connect two or more computers or networking devices in a network, network cables are used. There are three types of network cables; coaxial, twisted-pair, and fiber-optic. Typically, the core of single-mode fiber is up to five times. 100BASE-T is a technical term that defines the family of physical layers (or PHYs) supporting 100 Mbps networks over twisted pair cables.