Is there no shielding function for the network cable now?

　　Now there are still types of network cables with shielding function, namely shielded network cables (STP, Shielded Twisted Pair). The following is a detailed introduction to shielded network cables:

　　I. Definition and structure

　　The shielded network cable adds a metal shielding layer inside the insulating jacket, which can effectively resist external electromagnetic interference, reduce signal interference and loss, and ensure the quality of signal transmission. The shielded network cable may have aluminum foil or braided mesh inside as a shielding layer. Aluminum foil can prevent high-frequency interference, such as high-voltage electricity, while metal mesh can prevent low-frequency interference, such as 50Hz power frequency interference.

　　II. Types and applications

　　According to the different shielding methods, shielded network cables can be divided into STP (Shielded Twisted-Pair) and FTP (Foil). Twisted-Pair) and other types. STP shielded twisted pair is the most common type of shielded network cable, and its shielding layer is usually composed of metal mesh or aluminum foil. FTP shielded twisted pair uses aluminum foil as the total shielding layer, and may have a separate shielding layer on each pair. These shielded network cables are widely used in environments with high requirements for signal integrity and anti-interference, such as data centers, medical equipment, and industrial control systems.

　　III. Performance advantages

　　Strong anti-interference ability: Shielded network cables can significantly reduce the impact of external electromagnetic interference on signal transmission, ensuring the stable transmission of data signals.

　　Stable transmission performance: The shielded network cable can still maintain good transmission performance in complex electromagnetic environments, reducing signal attenuation and distortion.

　　High security: Shielded network cables can prevent the leakage of the cable's own electromagnetic information, reducing the risk of information being illegally eavesdropped.

　　IV. Precautions

　　Grounding requirements: When using the shielded network cable, it is necessary to ensure that the entire system (including cables, sockets, crystal heads and distribution frames, etc.) is shielded, and the building needs to have a good ground system. If the grounding is poor or there are unshielded parts in the system, the shielding layer may become the transmission path of interference signals, which will reduce the network performance.

　　Higher cost: Compared to unshielded cable, shielded cable is usually more expensive because of its more complex manufacturing process and higher material costs.

　　V. Comparison with unshielded network cables

　　Unshielded Twisted (UTP) Pair) has no metal shielding layer, and its insulating plastic skin is only wrapped with 4 pairs of wires of different colors twisted together. Unshielded network cables can usually meet the needs in environments with low electromagnetic interference, and the cost is lower and the installation is more convenient. But in environments with high requirements for signal integrity and anti-interference, such as data centers, shielded network cables are a better choice.

　　To sum up, there are still types of network cables with shielding function, and shielded network cables have significant performance advantages in specific application scenarios. When choosing a network cable, it is necessary to consider it comprehensively according to actual needs and environmental conditions.