Which type of networking cable does not emit electromagnetic interference?

Fiber optic cables do not emit electromagnetic interference because they transmit data as light rather than electrical signals. This fundamental difference in the method of data transmission allows fiber cables to effectively avoid the electromagnetic interference that can affect copper and coaxial cables, which rely on electrical signals. Fiber optics are immune to crosstalk and signal degradation caused by nearby electrical devices, making them a preferred choice in environments where high-speed data transmission is essential, and interference is a concern.

In comparison, copper cables, coaxial cables, and twisted-pair cables can all be susceptible to electromagnetic interference, which can degrade the signal quality and reduce transmission effectiveness. Fiber's insulation from electromagnetic influence makes it particularly valuable in telecommunications and networking applications where reliability and performance are critical.