Conductor:Copper clad steel Insulation:PE Shield:Bonded Aluminum PET Sheath:PVC Length:Custom Length
A coaxial cable is a cable that has two concentric conductors, and the conductor and shield share the same axis. The most common coaxial cable consists of a copper wire conductor separated by an insulating material. On the outside of the inner insulating material is another layer of ring conductor and its insulator.
The advantage of coaxial cable is that it can support high-bandwidth communication on relatively long repeater-free lines, and its disadvantages are also obvious: First, the volume is large, the diameter of the thin cable is 3/8 inches thick, and it takes up the cable A lot of space in the pipeline; the second is that it cannot withstand tangles, pressure and severe bending, which will damage the cable structure and prevent signal transmission; finally, it is high cost, and all these shortcomings can be overcome by twisted pair, so now In the LAN environment, it has been basically replaced by the twisted pair based Ethernet physical layer specification.
Coaxial cables can be divided into two basic types, baseband coaxial cables and broadband coaxial cables.
Baseband coaxial cable The shielding layer of the baseband coaxial cable is usually a mesh structure made of copper, and its characteristic impedance is 50Ω. This cable is used to transmit digital signals. The commonly used models are RG-8 (thick cable) and RG-58 (thin cable). The most intuitive difference between thick and thin cables is the cable diameter. Thick cable is suitable for relatively large local networks. It has a long standard distance and high reliability. However, thick cables must be equipped with transceivers and transceiver cables, which is difficult to install, so the overall cost is high. In contrast, thin cables are simpler and less expensive; however, because the cables are cut during the installation process, when there are many connectors, it is easy to cause hidden contact. Regardless of whether the network is connected by thick or thin cables, the fault point often affects all the machines on the entire cable, and fault diagnosis and repair are troublesome. Therefore, baseband coaxial cables have gradually been replaced by unshielded twisted pair or fiber optic cables.
Broadband coaxial cable The shield of a broadband coaxial cable is usually stamped with aluminum and has a characteristic impedance of 75Ω. This type of cable is usually used to transmit analog signals. The commonly used model is RG-59, which is a standard transmission cable used in cable television networks. It can simultaneously transmit multiple TV signals in one cable. Broadband coaxial cables can also be used as transmission media for some computer networks.
Coaxial cables can be used for the transmission of analog and digital signals and are suitable for a variety of applications. The most important ones are television transmission, long-distance telephone transmission, short-distance connections between computer systems, and local area networks.