Coaxial cable is a cable consisting of an inner conductor, surrounded by a tubular insulating layer typically made from a flexible material with a high dielectric constant, all of which is then surrounded by another conductive layer (typically of fine woven wire for flexibility, or of a thin metallic foil), and then finally covered again with a thin insulating layer on the outside. The term coaxial comes from the inner conductor and the outer shield sharing the same geometric axis. Coaxial cables are often used as a transmission line for radio frequency signals. In a hypothetical ideal coaxial cable the electromagnetic field carrying the signal exists only in the space between the inner and outer conductors. Practical cables achieve this objective to a high degree. A coaxial cable provides protection of signals from external electromagnetic interference, and effectively guides signals with low emission along the length of the cable.

• Networks urban cable TV (CATV) and Internet
• Central Telephone
• From an issuer and its antenna broadcast (radio amateur)
• Lines of distribution of video signal (usually use the RG-59)
• Networks such as Ethernet data transmission in their old Versions 10Base2 and 10Base5
• Intercity telephone networks and submarine cables

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