Structural form of fiber optic distribution frame rack

1) The rack structure can be enclosed, semi enclosed, or open.
2) The rack height is divided into three categories: 2600mm, 2200mm, and 2000mm. It is recommended to use integer multiples of 120mm for its width, and 300mm, 450mm, and 600mm for depth.
3) The deviation of the external dimensions of the rack shall not exceed ± 2mm; The perpendicularity tolerance between the outer surface and the bottom reference plane shall not exceed 3mm.