A coaxial cable is a type of wire and signal transmission line, usually made of four layers of material: the innermost layer is a conductive copper wire, the outer layer of the wire is surrounded by a layer of plastic (used as an insulator or dielectric), and the outer layer of the insulation is also a thin mesh of conductive material (usually copper or alloy), and the outer layer of the conductive material is used as the outer skin. Coaxial cables can be used for the transmission of analog and digital signals and are suitable for various applications, including television transmission, long-distance telephone transmission, short distance connections between computer systems, and local area networks. Coaxial cable, as a means of transmitting television signals to thousands of households, has developed rapidly, which is cable television. A cable television system can load dozens or even hundreds of television channels, and its transmission range can reach tens of kilometers. Coaxial cables have long been an important component of long-distance telephone networks. Today, it faces increasingly fierce competition from fiber optics, ground microwaves, and satellites
Main Classification
Coaxial cables can be divided into two basic types, baseband coaxial cables and broadband coaxial cables.
baseband coaxial cable
The shielding layer of baseband coaxial cable is usually a mesh structure made of copper, with a characteristic impedance of 50 Ω.
. This cable is used for transmitting digital signals, and commonly used models include RG-8 (thick cable) and RG-58 (thin cable). The most intuitive difference between thick and thin cables is the difference in cable diameter. Thick cables are suitable for larger local networks, with long standard distances and high reliability; However, a thick cable network must install transceivers and transceiver cables, which is also difficult to install, resulting in a high overall cost. On the contrary, thin cables are relatively simple and have a lower cost; However, due to the need to cut off the cables during installation, there is a risk of poor contact when there are many connectors. Whether it is a network connected with thick or thin cables, the fault point often affects all machines on the entire cable, making fault diagnosis and repair very troublesome. Therefore, baseband coaxial cables have gradually been replaced by unshielded twisted pairs or optical cables Broadband coaxial cableFunction of testing report:
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