What is Baseband Coaxial Cable?

Coaxial cable A hard copper wire is used as the core and is covered with a layer of insulating material. This insulating material is surrounded by a densely woven mesh conductor, which is covered with a protective material. There are two widely used coaxial cables. One is a 50-ohm cable, which is used for digital transmission. Since it is mostly used for baseband transmission, it is also called baseband coaxial cable; the other is a 75-ohm cable, which is used for analog transmission, that is, the broadband coaxial cable to be discussed in the next section. This difference is caused by historical reasons, not by technical reasons or manufacturers.
The structure of coaxial cable gives it high bandwidth and excellent noise suppression characteristics. The bandwidth of coaxial cable depends on the length of the cable. A 1km cable can achieve a data transmission rate of 1Gb/s~2Gb/s. Longer cables can also be used, but the transmission rate must be reduced or an intermediate amplifier must be used. At present, coaxial cables have been largely replaced by optical fibers, but they are still widely used in cable television and some local area networks.