Characteristics of classified network wiring engineering the main characteristics of classified network wiring engineering are that as the wiring of network link, there is no electromagnetic radiation when transmitting information number, or although there is electromagnetic radiation, the induced signal generated on non classified wiring is less than the specified value required by confidentiality laws and regulations, so as to ensure that classified information does not leak, So as to block the outward transmission of classified information. In practice, no matter how the electrical signal is processed, an electromagnetic field will be generated in the process of long-distance propagation. The cable in this electromagnetic field will generate an induction signal, and its strength is directly related to the magnetic field strength, the distance between the radiation source and the induced line, and the length of the induction line.

The stronger the radiation source signal, the higher the frequency, the stronger the electromagnetic field generated, the closer the cable is to the radiation source, the longer the cable, and the stronger the induction signal. When the radiation line and the induction line are arranged in parallel, the sensitivity is the largest. When the two lines cross, the sensitivity decreases with the increase of angle. When the two lines are vertical, the sensitivity is zero. In order to reduce crosstalk and interference between wire pairs, the physical structure of two-wire stranding is technically adopted in the production of generic cabling, which will offset part of the electromagnetic field generated by the current, play a certain role in mutual isolation and reduce mutual interference. For crosstalk between different wire pairs of the same cable, some products also adopt the manufacturing process of changing the twist distance, Increase the attenuation of crosstalk signal. Adopting the production process of overall shielding of four pairs of cables will improve the mutual isolation effect between the four pairs of cables and other cables. The application of these technologies undoubtedly plays a good role in reducing crosstalk and interference. However, crosstalk and interference still exist. To ensure that one cable does not generate inductive signals on another cable, comprehensive measures must be taken in the project. For the construction of classified network, in addition to strict physical isolation from non classified network, its wiring is required to maintain a specified distance from non classified network wiring, independent ground wire, independent cabinet, etc.

The most important feature of classified network wiring engineering is that it is required to keep a specified distance from other network wiring and telephone lines; Keep a specified distance from security monitoring line, building automatic control network line, fire alarm line, broadcasting line and cable TV line; It is also required to keep a certain distance from power lines, HVAC pipes and fire pipes.