The ends of coaxial cables usually terminate with connectors. Electrical connections using twisted pair or coaxial cable are used within a building. Commercial antennas are generally designed to get an approximate match to standard coaxial cables. Cage lines are a kind of overhead line similar in construction to coaxial cables. Cable television signals use only a portion of the bandwidth available over coaxial lines. G.hn is standard for high-speed communications over power lines, phone lines and coaxial cables. The RF industry uses standard type-names for coaxial cables. Despite being shielded, interference can occur on coaxial cable lines. An alternative is the use of coaxial cables. This is due to its relatively lower costs compared to optical fiber and coaxial cable. Refer to the diagram below showing the inner and outer conductors of a coaxial cable. Gbit/s over a single coaxial cable. The upgrades made possible by the multiplexed coaxial cable were designated Caesar Phase III. S-parameters are used at frequencies where the ports are often coaxial or waveguide connections. The company relied heavily on a predominantly coaxial cable-based network.