Mentioned Fiber Optic Splice Closure , which has two common types of physical appearance, horizontal and vertical, which we generally say are horizontal and vertical. 1.Horizontal A horizontal fiber optic closure is like a flat or cylindrical outer casing. It typically contains one or more fiber splice trays to provide space and protection for fiber splices. Fiber splice trays used in different fiber splice closures may have different designs and fiber counts. It has two input ports and two output ports to provide space for 96 fiber connectors. In the fiber optic splice box, there are four standard 24 fiber splice trays stacked together. The horizontal fiber optic splice closure is designed to be waterproof and dustproof. They have good adaptability and compression resistance because they are usually made of high strength building plastic. Horizontal optical enclosures use more than vertical optical closures. 2. Vertical The vertical fiber optic closure looks like a dome and is therefore also referred to as a dome fiber optic connector closure. They meet the same specifications as horizontal and are designed for buried applications. The vertical fiber splice box is made of high-quality engineering plastics, with 1 in/out port, 2 in/out ports, and 3 in/out port types, suitable for different fiber core numbers.