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Shielding Principle Of FTP Cu Outdoor Cable

Shenzhen KW-LINK Electronic Co.,Ltd | Updated: Jul 26, 2017

                 Unlike the principle of balance cancellation of twisted pair, the FTP cable is added one or two layers of aluminum foil on the outside of four pairs of twisted pair. The principle of reflection, absorption and skin effect of metal on electromagnetic wave (the so-called skin effect is that the distribution of current in the conductor section tends to increase with the frequency of the conductor surface, the higher the frequency, the smaller the skin depth, that is, the higher the frequency, the weaker the penetrating ability of electromagnetic wave, the effective prevention of external electromagnetic interference into the cable, but also prevent internal signal radiation out, interference with other equipment work.FTP Cu Outdoor Cable

                 Experiments show that the frequency of more than 5mhz of electromagnetic waves can only be through 38μm thick aluminum foil. If the shielding layer is different from the twisted pair, the FTP cable is added one or two layers of aluminum foil outside of the four pairs of twisted pair. The principle of reflection, absorption and skin effect of metal on electromagnetic wave (the so-called skin effect is that the distribution of current in the conductor section tends to increase with the frequency of the conductor surface, the higher the frequency, the smaller the skin depth, that is, the higher the frequency, the weaker the penetration ability of electromagnetic waves, effectively prevent external electromagnetic interference into the cable, but also prevent internal signal radiation out, interfere with the work of other equipment.FTP Cu Outdoor Cable

                 Experiments show that the frequency of more than 5mhz of electromagnetic waves can only be through 38μm thick aluminum foil. If the thickness of the shielding layer exceeds 38μm, for example, the two-layer 25μm-thick aluminum foil shield for the Nike-sen FTP cable makes it possible to penetrate the shielding layer into the internal electromagnetic interference frequency mainly below 5MHz. However, the principle of twisted pair can be effectively offset by low frequency interference under 5MHz.FTP Cu Outdoor Cable