What are the advantages of coaxial cable?

1. What is a coaxial cable?

A coaxial cable is a cable with two concentric conductors, and the conductor and shield share the same axis. This is another type of wire that is widely used in computer networks. Since there is a layer that wraps the insulating material on the outside of the main wire and braids the shielding metal wire on the outside of the insulating material, it is possible to block external electromagnetic interference and improve communication quality.

2. What are the advantages of coaxial cables?

It can support high-bandwidth communication over longer lines without repeaters, and its disadvantages are obvious. One is the bulky, thin cable is 3/8" thick in diameter, which takes up a lot of room in the cable channel. It cannot withstand tangles, stress, and severe bending that can damage the cable structure and prevent signal transmission. High cost. All these disadvantages can be overcome with twisted pair. Therefore, in the existing LAN environment, it has basically been replaced by the Ethernet physical layer specification based on twisted pair.

3. Classification of coaxial cables

There are two types of coaxial cables: thin cable (RG-58) and thick cable (RG-11).

The diameter of the thin cable is 0.26 cm, the transmission distance is 185 meters, and the terminal resistance is 50Ω when used.

The thick cable (RG-11) has a diameter of 1.27 cm and a transmission distance of 500 meters. Because the diameter is quite thick, its elasticity is poor, and it is not suitable for erecting in a narrow indoor environment. Moreover, the production method of the RG-11 connector is relatively complicated, and it cannot be directly connected to the computer. It needs an adapter The converter is converted into an AUI connector, and then connected to the computer. Due to the stronger strength of the thick cable, the transmission distance is longer than that of the thin cable, so the main purpose of the thick cable is to play the role of the network backbone and connect several networks formed by thin cables. The impedance of the thick cable is 75Ω.

The main application scope of coaxial cable is as follows:

Equipment bracket connection, closed circuit television (CCTV), shared antenna system (MATV) and color or monochrome RF monitor transfer. These applications do not require the selection of precision video coaxial cables with particularly tight electrical tolerances. The characteristic resistance of the video coaxial cable is 75 ohms, and this value is not chosen randomly. Physics proves that the optimum attenuation characteristics of video signals occur at 77 ohms. In low power applications, the material and design determine the optimal impedance of the cable to be 75 ohms. Standard video coaxial cables are available in both solid conductor and stranded conductor designs. The stranded conductor design is recommended for some applications where the cable is to be bent, such as the internal connection of a CCTV camera to a tray and rack unit, or the transmission cable of a remote camera. Also includes monitoring equipment.

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