Fiber Optic cables are specified based on several parameters. The jacket, just as for copper cables, must withstand the environment that it’s used in, plus meet any fire resisting standards, often per UL specifications, especially when used indoors. Many FO applications are outdoors, so look for ‘outdoor’ ratings. In addition the optical cores are chosen, to optimize: signal speed, distance needed, and cost of the fibers as well as the equipment at the ends. Multi Mode is most common, and lower in cost, if distances are not long.