This kind of MPO/MTP® pre-terminated ultra-high density wiring box, 19 inches, 1U height reaches 144 cores, can be applied to data center, computer room, computer center and other high-density wiring places, front and rear removable upper cover, pull-out double the use of guide rails, detachable front bezels, ABS lightweight modular boxes, etc., makes the NT989 easy to use in high-density scenes, whether in cable or cable. It has A, B, C three layers of trays, each with independent aluminum guide rails and a sliding distance of 110mm. 4 x 12F MPO/MTP® module boxes can be installed in each tray, and each module box can be installed with 6 x DLC adapters to achieve 12 cores. Each module box has a separate ABS rail that can be easily installed without restrictions.