This kind of box using 19 '' standard rack, large capacity, high-density, fully modular design, fiber splicing unit box set, disc storage, wiring one, each with a fuse module can be individually withdrawn from the rack or stand to meet operating needs, the introduction of cable unit can be mounted from the top or the bottom appears in the upper or lower rack, cable and pigtails, pigtail cable jumpers clear the management level, but also have good operability of large capacity, with melting modules can be installed FC, SC, ST and other adapters, but also for ordinary ribbon pigtail pigtails and melting with and with splice unit box for direct welding.