What is the difference between coaxial cable and fiber optic jumper
Fiber optic patch cords are similar to coaxial cables, but without the mesh shield. In the center is the glass core for light propagation. In a multimode fiber, the core diameter is 50 μm to 65 μm, which is roughly equivalent to the thickness of a human hair. The single-mode fiber core has a diameter of 8 μm to 10 μm. The core is surrounded by a glass jacket with a lower refractive index than the core to keep the fiber inside the core. On the outside is a thin plastic jacket to protect the envelope.
According to the fire rating of the building and the fire resistance requirements of the material, the integrated wiring system should take corresponding measures. In flammable areas and building shafts, flame-retardant cables and optical cables should be used for laying cables or optical cables; in large public places, flame-retardant, low-smoke, and low-toxic cables or optical cables should be used; adjacent equipment rooms or handover rooms Flame-retardant wiring devices should be used.
There are three main types of fiber optic jumpers according to the type of termination: ST-ST, SC-SC, and ST-SC. According to the type of optical fiber, there are mainly two types: single-mode optical fiber and multi-mode optical fiber. The specifications of the jumper length are 0.5m, 1m, 2m, 3m, 5m, 10m, etc. According to the cable outer sheath material, it can be divided into ordinary type, ordinary flame-retardant type, low-smoke halogen-free type (LZSH), low-smoke halogen-free flame-retardant type, etc.
It is used at the active connection of optical fiber. In the computer room, it is mainly used for the connection between the optical cable terminal and the equipment. When the user is determined, set up an optical cable transfer box. After the user is determined, the user will lay the optical cable to the transfer box. The advantage of this is to increase the core utilization rate of the outgoing backbone communication optical cable).
Coaxial cable is composed of a core, insulation, shield, and jacket. Because these parts all have the same axis, this is called a coaxial cable. The main raw material of the coaxial cable is made of copper, including the core and shielding, while the optical fiber jumper is made of quartz as the main raw material, so the cost of the coaxial cable is much higher than that of the optical fiber jumper.
What is the working principle of coaxial cable
The coaxial cable is divided into four layers from the inside to the outside: the central copper wire (single-strand solid wire or multi-strand wire), plastic insulator, mesh conductive layer and wire sheath. The central copper wire and the mesh conductive layer form a current loop. It is named because the central copper wire and the mesh conductive layer are in a coaxial relationship.
Coaxial cables conduct alternating current rather than direct current, which means the direction of the current reverses several times per second.
If you use ordinary wires to transmit high-frequency currents, this wire will act as an antenna that transmits radio to the outside. This effect consumes the power of the signal and reduces the strength of the received signal.
Coaxial cables were designed to solve exactly this problem. The radio emitted by the central wire is isolated by the mesh conductive layer, and the mesh conductive layer can control the emitted radio by grounding.
There is also a problem with coaxial cables, that is, if a certain section of the cable undergoes relatively large extrusion or twisting deformation, the distance between the central wire and the mesh conductive layer will not be consistent, which will cause the internal radio waves to be blocked. Reflected back to the source from which the signal was sent. This effect reduces the received signal power. To overcome this problem, a plastic insulator is inserted between the central wire and the mesh conductive layer to ensure a consistent distance between them. This also contributes to the relatively rigid nature of the cable and makes it less prone to bending.
