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As the shell of the product, the communication cabinet can provide space for the power supply, motherboard, various expansion board cards, floppy drives, disc drives, hard disk drives and other storage equipment, and through support, brackets, various screws or card clips inside the chassis, etc. The connectors firmly fix these spare parts inside the chassis, so as to form a integrated whole, so that each component can operate normally and ensure the realization of product functions. During the design of the communication cabinet, the designer should determine the size of the cabinet according to the specific product needs, provide a reasonable space for the configuration of the internal parts, and avoid the waste of resources caused by excessive space or too small as much as possible. Essence