Coax or Coaxial cable is typically used for video transmission or for high speed data applications. Coaxial Cable Coaxial Cable by definition is a cable with both an inner conductor and outer conductor through which it carries its signal. There are a wide array of Coaxial Cable types, but the most common types used in commercial applications for video service, video surveillance, or for high speed networks include RG-6 and RG-59. For video applications, it is essential to choose a coax cable that are of the 75 ohm type. Some 50 ohm Coax cables are suitable for data networks, but are not sufficient for video transmission.