Coaxial cables can be divided into baseband coaxial cables and broadband coaxial cables (i.e. network coaxial cables and video coaxial cables) in terms of purpose. Coaxial cables are divided into two categories: 50 Ω baseband cables and 75 Ω broadband cables. Baseband cables are divided into thin coaxial cables and thick coaxial cables. The baseband cable is only used for digital transmission, with a data rate of up to 10Mbps. Coaxial cable refers to a cable that has two concentric conductors, and the conductor and shielding layer share the same axis. The most common coaxial cable is composed of copper wire conductors separated by insulation material, with another layer of circular conductor and its insulation outside the inner layer of insulation material. The entire cable is then wrapped in a sheath of polyvinyl chloride or teflon material. At present, there are two types of commonly used coaxial cables: 50 Ω and 75 Ω coaxial cables. 75 Ω coaxial cables are commonly used in CATV networks, hence they are called CATV cables, with a transmission bandwidth of up to 1GHz. Currently, the transmission bandwidth of commonly used CATV cables is 750MHz. 50 Ω coaxial cables are mainly used for baseband signal transmission, with a transmission bandwidth of 1-2OMHz. Bus type Ethernet uses 50 Ω coaxial cables. In Ethernet, the maximum transmission distance of 50 Ω thin coaxial cables is 185 meters, and thick coaxial cables can reach 1000 meters
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