Indoor fiber optic cable is a cable by the optical fiber (light transmitting carrier) through a certain process and formed. Mainly by optical fiber (as thin as a hair, glass) and protective plastic casing and plastic sheath structure, no internal cable gold, silver, copper and aluminum and other metals, usually no recycling value. Indoor fiber optic cable is a certain amount of the composition according to a certain way of the cable core, outsourcing jacket, some clad outer sheath to achieve a communication line optical signal transmission. Indoor fiber optic cable tensile strength is small, the protective layer is poor, but also more lightweight and economical. Indoor Cable mainly used in building wiring, and connections between network devices. Indoor Cable restricted building environment, laying conditions, resulting in a structural design tends to complicate indoor cable, fiber optic cable used with diverse materials, mechanical properties and optical properties of the fiber optic cable have focused on and so on.