Introduction of electromagnetic shielding cabinet

With the gradual deepening of people's understanding of the harm of electromagnetic leakage and emission of classified information systems, a large number of measures have been adopted to prevent electromagnetic leakage and emission in the construction of classified information networks, including the construction of electromagnetic shielding rooms, laying optical cables and shielded twisted pairs, using low-radiation equipment, red and black power isolation sockets and shielded cabinets.

Among them, the shielding cabinet has the characteristics of small size, convenient installation and flexible use, which is very suitable for those occasions that are not suitable for installing electromagnetic shielding rooms and need to protect information equipment

However, in the actual test, it is found that the use effect of the shielded cabinet which has been strictly tested in the laboratory often fails to meet the design requirements, which makes many users unable to effectively prevent electromagnetic leakage and emission.

After careful analysis, it is found that many users do not use optical fiber when connecting communication lines to equipment in shielded cabinets, but directly use shielded twisted pair to connect. When connecting, the cabinet only simply handles the shielding layer of the shielded twisted pair, and even worse, directly connects the unshielded twisted pair to the shielded cabinet.

These practices will greatly reduce the shielding effectiveness of shielding cabinets, and even not only fail to play a protective role, but become the emission source of information leakage emission. With the more and more extensive use of shielding cabinets, there are more and more cases of misuse, and the problems are increasingly prominent, and there are hidden dangers of leakage.