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Shielding technology is to use metal materials with good absorption and reflection ability to resist interference. According to the characteristics of electromagnetic interference, choose good low-resistance conductive materials or magnetic conductive materials to form appropriate shielding. Use containers made of low-resistance materials such as copper or aluminum to wrap the parts to be protected, or use containers made of good ferromagnetic materials from magnetic conductivity to wrap the parts to be protected. Shielding is generally divided into three types: electrostatic shielding, magnetic shielding and electromagnetic shielding.

Shielding technology originated in Europe, which is to add a metal shielding layer outside the ordinary unshielded wiring system, and realize the function of preventing electromagnetic interference and electromagnetic radiation by using the reflection, absorption and skin effect of the metal shielding layer. Shielding technology comprehensively utilizes the balance principle of twisted pair and the shielding effect of shielding layer, so it has very good electromagnetic compatibility (EMC) characteristics. Most end users in Europe will choose shielded cabling system, especially in Germany, where about 95% users install shielded cabling system and the other 5% install optical fiber.

At present, shielding is almost recognized by more and more users, and its good performance in electromagnetic compatibility is also being recognized by more and more users. The shielded wire products on the market are not only imported from Europe, but also provided by more and more manufacturers. In the latest North American wiring TIA/EIA-568-B standard, shielded cable and unshielded cable are recommended media for horizontal wiring, thus ending the history of North America without shielding system.

In China, more and more users, especially those projects involving confidentiality and strong radiation, begin to pay attention to and use shielding systems, even six types of shielding systems. Shielding technology has a complete set of shielding and grounding theory and product series, providing the most complete and comprehensive cables, components and end-to-end full shielding solutions to meet the growing needs of today's network. Of course, some disputes about shielded wiring system in the industry at present may also make users not know much about shielding technology.