AN5006-20 is a new generation of 2U plug-in carrier-grade MDU ONU communication equipment designed by our company for Fiberhome Communications Company. It adopts front plug-in disk structure, compact structure and compact appearance. The dimensions of the device are 2U 440 (W) X88 (H) X250 (D). The device meets the installation requirements of a 300-deep, 19-inch cabinet. Besides the standard mounting ears in the front, the device supports wall-mounted installation. The following figure shows the configuration of the device. On the left is a fan module pumping air, on the right is a power module and main control module with 1.6 "slot spacing, and on the far right are four service boards with 0.8" slot spacing. The fan draws air on the left side, the module is inserted horizontally, and the ventilation hole is opened on the right side, so that the air duct is formed from right to left. The design of the chassis is extremely compact, width dimension through communication with the customer for many times, optimize the design and optimization process, achieve the limit size, so as to maximize the module PCB size, conducive to the layout of components in the module. The wrench design takes up less space at the bottom of PCB and saves space for the front components of PCB. Conducive to the layout of exposed devices. A cable rack is designed for the right mounting ear of the chassis, which cleverly uses the space of the mounting ear, thus saving space. The communication equipment shielding grade: IEC61587-3, E class.