Which type of cable is not recommended for under-carpet installations?

Optical fiber cable is not recommended for under-carpet installations mainly due to its sensitivity and rigidity. Fiber optic cables are composed of glass or plastic strands that transmit data as light. Unlike copper cables, which can be more flexible and resilient to environmental factors, fiber optic cables can be easily damaged if not handled correctly. When installed under carpet, the potential for pressure, bending, or impact could exceed the cable's tolerance, leading to signal loss or complete failure. Additionally, fiber optic cables often require special connectors and handling due to their delicate nature, making installation more complicated in confined spaces like those under carpets.

In contrast, coaxial, twisted pair, and Ethernet cables are generally more robust and flexible, allowing for easier installation in diverse environments, including under carpets. These types of cables are designed to withstand more physical stress, making them more suitable for such applications.