Coaxial cable refers to a cable with two concentric conductors that share the same axis as the shielding layer. The most common coaxial cable is composed of copper conductors isolated by insulating materials. The inner insulation material is surrounded by another circular conductor and its insulation, and the entire cable is wrapped in a PVC or PTFE material sheath.
Classification method for coaxial cables:
Coaxial cables can be divided into two basic types: baseband coaxial cables and broadband coaxial cables. Currently, baseband is a commonly used cable. Its shielding wire is a copper mesh with a characteristic impedance of 50 (such as RG-8, RG-58, etc.); The shielding layer of commonly used broadband coaxial cables is usually stamped with aluminum, with a characteristic impedance of 75 (such as RG-59). Coaxial cables can be divided into thick coaxial cables and thin coaxial cables according to their diameter. Coarse cables are suitable for relatively large local networks, with long standard distances and high reliability. Due to the fact that cables do not need to be cut during installation, the computer's access position can be flexibly adjusted as needed. However, thick cable networks require the installation of transceiver cables, which is difficult to install and has a high overall cost. On the contrary, the installation of thin cables is relatively simple and cost-effective, but due to the cutting of cables during the installation process, the basic network connector (BNC) must be installed at both ends and then connected to the two ends of the T-shaped connector. Therefore, the joint is prone to adverse hazards and is one of the most common faults in Ethernet operation.
