On the copper side, there is at least one product that has security built-in. Siemon introduced a shielded copper cabling system named "TERA" back in 1999 that has more recently been validated for TEMPEST high-security government applications.
While it does not use the typical RJ-45 form factor, the TERA interface and cable are standards approved for ISO/IEC category 7/class FA specifications. The standards at this level call for 1,000 MHz frequency bandwidth - ideal for 10GBASE-T and broadband CATV applications.
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