①UTP: Unshielded twisted pair cable.

②STPFTP is a single-layer shielded twisted pair of aluminum foil. STP: Shielded network cable,FTP is aluminum foil shielded network cable; The former is a broad name, the latter is a narrow noun. But in fact, the current shielding network cable is the aluminum foil shielding network cable, so STP, FTP is actually the same. Compared to UTP, FTP/STP simply adds an extra layer of aluminum to the outside of the core wire

Foil, designed to reduce signal attenuation.

③SFTP is a double-layer shielded twisted pair wire with an inner aluminum foil and an outer woven net. The structure of this line is based on the aluminum foil of STP/FTP, plus a layer of tinned copper braided net, and the outermost is a PVC outer coating. Due to the addition of a layer of tinned copper braided net, it can greatly reduce the interference of the external magnetic field and signal, but also reduce the attenuation of the internal signal and increase the tension of the cable.