Coaxial cables can be divided into two basic types: baseband coaxial cables and broadband coaxial cables .
Baseband coaxial cable
Baseband coaxial cable shielding layer is usually made of copper mesh structure, its characteristic impedance for 50 Ω.The cable is used to transmit digital signals. Commonly used models are RG-8(thick cable) and RG-58(thin cable).The most obvious difference between thick cable and thin cable is the cable diameter.Thick cable is suitable for large local network with long standard distance and high reliability.However, the rough cable network must install transceiver and transceiver cable, which is difficult to install, so the overall cost is high.On the contrary, thin cables are simpler and less costly.However, due to the need to cut off the cable in the installation process, it is easy to have a hidden danger of poor contact when the joint is too large.
Whether the network is connected with a thick cable or a thin cable, the fault point often affects all the machines on the entire cable, making fault diagnosis and repair difficult.Therefore, the baseband coaxial cable has been gradually replaced by unshielded twisted pair or optical cable .
Wide-band coaxial cable
Broadband coaxial cable shielding layer is usually use aluminum stamping, and its characteristic impedance for 75 Ω.This cable is commonly used to transmit analog signals, commonly known as RG-59. It is the standard transmission cable used in cable television networks and can transmit multichannel TELEVISION signals simultaneously on one cable.Broadband coaxial cables can also be used as a transmission medium for some computer networks.