Fiber optic box from China are also called fiber patch panels, used in the use of optical fiber technology to transmit digital and similar voice, video and data signals. The fiber cartridge can be mounted directly or as a desktop installation. Especially suitable for high-speed optical fiber transmission. Also known as fiber terminal box, is the optical end of the box, for the cable overhead, pipe, buried, and the laying of wells and straight through the branch connection. Optical fiber box is an important auxiliary equipment in optical transmission system. It is mainly used for optical fiber welding, optical connector installation, optical circuit transfer, storage of excess pigtail and protection of optical cable. It is suitable for optical fiber communication network security Running and flexible use has an important role. As a fiber box should be able to make the largest number of fiber optic cable in the board of the full shelves, where possible, can be linked to a few more cable in a frame to facilitate the deployment of light path. At the same time, the capacity of the patch panel should correspond to the series of universal cable cores, so that the use of the equipment can be reduced or avoided due to improper handling caused by fiber cartridge capacity waste. Fiber box can be divided into two categories: one is the desktop fiber box, one is the rack-type fiber box. Rackmount fiber cartridge, rack capacity and unit capacity (as determined by the number of adapters) should be specified in the product enterprise standard. Fiber optic terminal devices, optical fiber storage devices, fiber optic connection device in the full capacity range should be able to set. The rack and unit shall have perfect marking and recording means for easily identifying the serial number or transmission sequence, and the recording device shall be easy to modify and replace. But no matter what kind of fiber box, should have a cable to introduce, fix and protect the device. The device will be introduced into the cable and fixed to the frame, to protect the cable and cable core damage. The metal part of the cable is insulated from the metal frame. After the fixed cable, the metal sheath and the reinforced core should be connected with the high voltage protection grounding device.