The main function of Cable shielding materials
Time:
2021-11-09 15:22
Source:
Cable shielding materials include aluminum foil and woven mesh. What is the difference in the use of these two materials?
Cable shielding materials aluminum foil is mainly used for shielding high-frequency electromagnetic waves, preventing high-frequency electromagnetic waves from contacting the network cable conductors to generate induced currents and increase crosstalk. When high-frequency electromagnetic waves touch the aluminum foil, according to Faraday's law of electromagnetic induction, the electromagnetic waves tend to adhere to the surface of the aluminum foil and induce current. At this time, a conductor is needed to lead the induced current into the ground to avoid the induced current from causing interference to the transmission signal. The use of aluminum foil as Cable shielding materials generally requires that the repetition rate of aluminum foil should not be less than 20%. This type of network cable is mainly used in hospitals, factories and other places with strong electromagnetic wave radiation or with a large number of strong electrical equipment; in addition, it is also used in areas with high network security requirements such as the government.
Cable shielding materials are generally woven from tinned round copper wires. Mainly to prevent low-frequency electromagnetic wave interference. Its working principle is the same as that of aluminum foil. The shielded cable using braided mesh requires the density of the braided mesh to be greater than 60%. This type of weaving network is mainly used to lay a large number of network cables in the same cable trough, which can reduce the external crosstalk generated between the network cables. In addition, it can also be used for shielding between pairs to increase the twisted length of the pair and reduce the twisting distance requirements for the cable. During construction, it is necessary to tie the woven net and drainage line into a bundle for drainage.
Generally, drain wires are used for cable shielding materials, and the material of the drain wires is generally tinned round copper wire. Mainly play the role of grounding and tensile resistance. During construction, the drain wire must be connected to the shielded crystal plug, shielded module or shielded patch panel, and the drain wire must not be cut off. Otherwise, Cable shielding materials will not only fail to shield interference, but will even become a source of interference.
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