Is there a document that explains the difference in terms of Alien cross talk and the protection?
S/FTP (Screened/Foiled Twisted Pair) and F/FTP (Foiled Twisted Pair) are two types of shielded cables that offer protection against Alien Crosstalk, but S/FTP only provides additional shielding compared to F/FTP in environments where there is expected to be greater external electromagnetic interference.