The shielded cable’s resistance to external interference is mainly reflected in: the integrity of signal transmission can be guaranteed by the shielding system. The shielded wiring system can prevent the transmitted data from being affected by external electromagnetic interference and radio frequency interference.
Electromagnetic Interference (EMI) is mainly low frequency interference. Motors, fluorescent lamps and power lines are common sources of EMI.
Radio frequency interference (RFI) is high frequency interference, mainly radio frequency interference, including radio, television broadcast, radar and other wireless communications.
For resistance to electromagnetic interference, braided shielding is the most effective choice, that is, metal mesh shielding, because of its low critical resistance.
For RFI, foil shielding is most effective because the gaps created by the metal mesh shield allow high-frequency signals to enter and exit freely.
For the mixed interference field of high and low frequency, the combined shielding method of metal foil layer and metal mesh should be used, that is, the double-layer shielded cable in the form of S/FTP, which can make the metal mesh shielding suitable for interference in the low frequency range, and the metal foil shielding Suitable for interference in the high frequency range.
The single-layer thickness of the aluminum foil shielding layer in the IBM ACS shielded cable reaches 50-62 μm, which has a more complete shielding effect.
At the same time, because only a single layer of shielding is used, it will be simpler for construction, easy to install, and not easy to cause artificial damage during the construction process, and the thickness of the aluminum silk can withstand greater destructive force. This can provide users with higher quality transmission performance.