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Coaxial cable was invented in 1929 and first used commercially in 1941. AT&T established its first cross-continental coaxial transmission system in 1940.== DS-3 ==== Common Coaxial Cable Types == === DS-3 ===== RG-6U 75 Ohm ===== RG-6U 75 Ohm ===== RG-58 Coaxial 50-Ohm ===== RG-58 Coaxial 50-Ohm ===== RG-59 75 Ohm ===== RG-59 75 Ohm ===== RG-62U 92 Ohm ===== RG-62U 92 Ohm ===