Coaxial Cable Assemblies---ZOMWAVE

Introduction to coaxial cable

Coaxial cable refers to a cable with two concentric conductors, and the conductor and the shield share the same axis.

The most common coaxial cable consists of a copper wire conductor separated by an insulating material, on the outside of the inner layer of insulating material is another layer of ring conductor and its insulator, and then the entire cable is wrapped by a sheath of PVC or Teflon material .

Classification of coaxial cables:

Coaxial cables can be divided into two basic types, baseband coaxial cables and broadband coaxial cables.

At present, the baseband is a commonly used cable, and its shield wire is made of copper mesh, and the characteristic impedance is 50 (such as RG-8, RG-58, etc.);

The shielding layer of cables commonly used in broadband coaxial cables is usually stamped from aluminum, and the characteristic impedance is 75 (such as RG-59, etc.).

Coaxial cables can be divided into thick coaxial cables and thin coaxial cables according to their diameters.

Thick cable is suitable for relatively large local networks. Its standard distance is long and its reliability is high. Since the cable does not need to be cut during installation, the network access position of the computer can be flexibly adjusted according to needs, but the thick cable network must be installed with transceiver cables. Difficulty, so the overall cost is high.

On the contrary, the installation of thin cables is relatively simple and the cost is low, but since the cable must be cut off during the installation process, the basic network connector (BNC) must be installed at both ends, and then connected to both ends of the N type connector, so when there are many connectors, it is easy to produce bad defects. hidden danger, which is one of the most common failures of Ethernet in operation today.

Whether it is a thick cable or a thin cable, it is a bus topology, that is, multiple machines are connected to one cable. This topology is suitable for a dense machine environment, but when a contact fails, the failure will affect the entire cable in series. on all machines.

It is troublesome to diagnose and repair the fault, so it will be gradually replaced by unshielded twisted pair or fiber optic cable.