Fiber Optic Splice Closure is a popular name, scientific name is optical cable splice box, also known as optical cable splice package, optical cable joint package, and barrel. It belongs to the mechanical pressure sealing joint system and is a splicing protection device that provides continuity of optical, sealing,  and mechanical strength between adjacent optical cables. It is mainly used for straight-through and branch connections of overhead, pipeline, direct burial and other laying methods of optical cables of various structures.

　　The box body is made of imported reinforced plastic, which has high strength and corrosion resistance. The terminal box is suitable for the connection in the terminal room of the structural optical cable. The structure is mature, the sealing is reliable, and the construction is convenient. Widely used in communications, network systems, CATV cable television, optical cable network systems and so on. The right side is the two-in-two-out connector box;

　　It is used for protective connection and optical fiber distribution between two or more optical cables. It is one of the common equipment for user access points. It mainly completes the connection between distribution optical cables and household line optical cables outdoors, and can be connected according to FTTX. Requires installation of cassette or simple optical splitter

　　performance requirements

　　After the optical fiber connector is protected by the splice box, it should be protected from moisture, and the attenuation of the optical fiber connector before protection should not be increased, and the following requirements should be met:

　　Optical properties

　　The remaining optical fibers in the optical cable splice box are coiled in the optical fiber placement device. During the installation and use of the optical cable splice box, the optical fiber joint should have no obvious additional attenuation.

　　sealing performance

　　After the optical cable joint box is packaged according to the specified operating procedures, the inflation pressure in the optical cable joint box is (100 ± 5) kPa, and it should be immersed in a clean water container at room temperature for stable observation for 15 minutes, and no bubbles should escape, or stable observation for 24 hours with a barometer The indication should be unchanged.

　　Resealing performance

　　The optical cable splice box shall be tested after repeated 3 times of packaging according to the specified operation procedure. The inflation pressure in the optical cable splice box is 100kPa±5kPa, and there should be no bubbles escaping after 15 minutes of stable observation in a clean water container at room temperature, or no change in the indication of the barometer for 24 hours after stable observation.

　　Mechanical behavior

　　After the following tests, there should be no change in the box body of the optical cable splice box and the parts in the box. If necessary, a light inspection or opening of the box should be performed. The following tests should be filled with (60±5) kPa air pressure in the optical cable joint box, and the air pressure should not change after the test; immersed in a clean water container at room temperature for 15 minutes, there should be no bubbles escaping or stable observation for 24 hours. The barometer indicator There should be no change, and the shell and its components should be free from cracks, damage, and obvious deformation