Indoor optical cable is composed of a certain number of optical fibers in a certain way to form a cable core, which is covered with a sheath, and some are also covered with an outer sheath.Its features are flexible for bending, fast speed transmission, clear and stable signal, anti-interference performance and big flow of transmission. There are indoor compact type and branch type, mainly including drop fiber cable, long distance fiber cable and tight coated fiber. Indoor optical cable is laid in the building and mainly used for communication equipment in the building , computer, switch and end-user equipment for transmitting information.