Fiber optic networks are rapidly replacing copper wire networks in the telecommunications industry. Optical fiber is a fragile strand of pure glass that works as a long-distance waveguide for light. It works on the premise of total inward reflection. The core, which carries the actual light signal, and the cladding, a layer of glass around the body, are the two layers of glass that make up fiber optic cable. Below are six things you should consider before purchasing these cable wires: