Ethernet technology started with using the costly coaxial cables. Now it is possible to carry ethernet frames over cost-effective and cheaper twisted pair cables supporting greater speeds. Another variation of ethernet is to use cable like that of cable TV. This variation of Ethernet is called thin wire ethernet which is expensive but cover only small distances.
Another variation of ethernet technology is to multiplex several ethernets onto a single cable by assigning different frequencies for each ethernet. Such an approach is called the broadband ethernet. The recipient should be tuned to a particular frequency to receive the frames of a particular ethernet.