Coaxial cable (English abbreviation "coax") is a basic unit (coaxial pair) composed of two coaxial, mutually insulated cylindrical metal conductors, and then composed of a single or multiple coaxial pairs. Long used to transmit data and video signals, it was one of the first media to support 10BASE2 and 10BASE5 Ethernet, enabling 10 Mb/s transmission up to 185 meters or 500 meters respectively. The term "coaxial" means that the axis or center point of the cable's center conductor and its shield are the same. Some coaxial cables may have multiple shields, such as quad-shielded coaxial cable, which consists of two shields, each consisting of wire mesh wrapped around aluminum foil. This shielding characteristic of coaxial cable makes it have strong anti-electromagnetic interference ability and can transmit high-frequency signals over long distances. Main Types There are several different types of coaxial cables that support a wide range of specialized applications such as satellite communications, industrial, military and marine applications. The three most common non-industrial coaxial cable types are RG6, RG11, and RG59, with RG6 most commonly used in applications such as CCTV and CATV in enterprise environments. RG11 has a thicker center conductor than RG6, which means lower insertion loss and longer distances for signal transmission. However, thicker RG11 cables are more costly and very inflexible, making them unsuitable for deployment in interior applications and more suitable for long-distance outdoor installations or straight backbone links. RG59 is more flexible than RG6, but its loss is higher, and it is rarely used in applications other than low-bandwidth, low-frequency analog video applications with short distances and limited wireway space (rear-view cameras in automobiles).