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Coaxial Cable Specification Model
- Jun 15, 2018 -

Coaxial cable can be divided into two basic types by use: baseband coaxial cable and broadband coaxial cable. At present, the cables commonly used in baseband are shielded by copper mesh with characteristic impedance of 50(such as rg-8, rg-58, etc.). The shielding layer of broadband coaxial cable is usually made of aluminum with characteristic impedance of 75(such as rg-59, etc.).

According to the diameter of coaxial cable is divided into: coarse coaxial cable and fine coaxial cable. Thick cable is suitable for large local network, it has long standard distance and high reliability. Thick cable network must install transceiver and transceiver cable, installation is difficult, so the overall cost is high. Instead, fine line installation is more simple, low cost, but as a result of the installation process to cut the cables, both ends must be fitted with basic network connection head (BNC), and then in the T connectors at both ends, so when the joint is more prone to poor contact of the hidden trouble, this is currently running one of the most common failures of Ethernet what had happened.

In order to maintain the correct electrical characteristics of coaxial cable, the cable shield must be grounded. At the same time, there should be terminals at both ends to weaken the signal reflection.

Both the thick cable and the thin cable are bus topologies, i.e. multiple machines connected to one cable. This topology is suitable for machine-intensive environments. But when a failure occurs, a contact fault series will affect the entire root all the machines on the line, fault diagnosis and repair are very trouble, therefore, will gradually be replaced by not shielded twisted-pair cable or optical cable.