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The use of shielded cables in security systems provides some protection from power frequency and radio frequency interference, reducing the number of false alarms being generated. The best practice is to keep data or signal cables physically separated by at least 3 inches (75mm) from 'heavy' power circuits which are in parallel.
Cross-section through a coaxial cable showing shielding and other layers. One example is a shielded cable, which has electromagnetic shielding in the form of a wire mesh surrounding an inner core conductor. The shielding impedes the escape of any signal from the core conductor, and also prevents signals from being added to the core conductor.
Cable with shielding is known as shielded twisted pair (STP) ... UTP is now used in some video applications, primarily in security cameras. [6]
The U.S. and NATO Tempest standards, and similar standards in other countries, include Faraday cages as part of a broader effort to provide emission security for computers. Automobile and airplane passenger compartments are essentially Faraday cages, protecting passengers from electric charges, such as lightning.
TEMPEST (Telecommunications Electronics Materials Protected from Emanating Spurious Transmissions [1]) is a U.S. National Security Agency specification and a NATO certification [2] [3] referring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations.
Undersea cables are a symbol of the interconnectedness that defines the modern world. Protecting them is not just a matter of national security but of preserving the stability of the global system.
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