Coaxial cable is also one of the most common transmission media in LANs. The pair of conductors it uses to transmit information is selected according to a layer of a cylindrical outer conductor set outside the inner conductor (a fine core) and the two conductors are isolated from each other by an insulating material. The outer conductor is The center axis of the center axis is on the same axis, so it is called coaxial cable. The reason why the coaxial cable is designed in this way is also to prevent the transmission of abnormal signals from external electromagnetic waves. Next Xiaobian introduced the working principle of the coaxial cable standard and coaxial cable.

Coaxial cable standard

Coaxial cable adopts GB/T14864-1993 national standards. The video coaxial cable is composed of two concentric and insulated cylindrical metal conductors that form a basic unit (coaxial pair) and then a single or multiple coaxial pairs. The coaxial cable is divided into four layers from the inside to the outside: the center copper wire, the plastic insulator, the mesh conductive layer and the wire sheath. The center copper wire and the mesh conductive layer form a current loop. Because the center copper wire and mesh conductive layer is named after the coaxial relationship.

Coaxial cable working principle

The coaxial cable is divided into four layers from the inside to the outside: the center copper wire (single stranded solid wire or stranded wires), the plastic insulator, the mesh conductive layer and the wire sheath. The center copper wire and the mesh conductive layer form a current loop. Because the center copper wire and mesh conductive layer is named after the coaxial relationship. The coaxial cable conducts alternating current instead of direct current, which means that the current direction will be reversed several times per second. If a general wire is used to transmit high-frequency currents, this wire will be equivalent to an antenna that transmits radios to the outside. This effect will degrade the power of the signal and reduce the received signal strength. Coaxial cable is designed to solve this problem. The radios emitted by the center wires are isolated by a mesh-like conductive layer, which can control the transmitted radio through grounding. The coaxial cable also has a problem. If a certain part of the cable is crushed or distorted, the distance between the center wire and the meshed conductive layer is not consistent. This causes the internal radio waves to be affected. Reflected back to the signal source. This effect reduces the signal power that can be received. To overcome this problem, a layer of plastic insulator was added between the center wire and the mesh conductive layer to ensure that the distance between them was consistent. This also causes the cable to be stiff and not bendable.

Coaxial cable advantages and disadvantages

The advantage of coaxial cable is that it can support high-bandwidth communications over relatively long repeater-less lines, and its disadvantages are also obvious: First, the bulky, thin cable diameter is 3/8 inch thick, and it takes up cable There is a lot of space in the pipeline; the second is that it cannot withstand tangles, stress, and severe bending. These can damage the cable structure and prevent the transmission of signals. Finally, the cost is high, and all these disadvantages are exactly what the twisted pair can overcome. So now The LAN environment has basically been replaced by the twisted-pair Ethernet physical layer specification.

Editor's summary: The working principle of the coaxial cable standard and coaxial cable is introduced here, and we hope to help everyone. If you want to know more related information, you can pay attention to this website information.

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