In order to improve the cable and pipeline management and maintenance level, enhance the ability to quickly access the business, should gradually increase the coverage density of light box making; In view of the current situation of high occupancy rate of the gathering room, in order to reduce the influence of the relocation of the leased machine room on the optical cable network, we should set up the light delivery box; Cable transfer box should be set in a safe, hidden and convenient for construction and maintenance and easy import line, less vulnerable to external damage and natural disasters, but also conform to the city planning and does not interfere with the city traffic, does not affect the appearance of the city. Access to the trunk should be set in the trunk road or street intersection, easy to extend coverage of the cable to the wiring layer; Light delivery capacity should be considered at the network level and business requirements, for the core convergence and trunk level, the light delivery capacity should be based on576 core based; for the existing small capacity light delivery box (below 288 core), if you can not meet the needs of the business should be expanded, if unable to expand the use of large capacity light box replacement.

Specification for installation of 576 junction boxes and base: 

1 junction box installation must be solid, firm, safe and reliable, the box is horizontal and vertical, the box door should be in good condition.

2 junction box assembly should be fully equipped with a complete, terminal firm. 

3, the junction box number, cable and fiber core number and other signs should be correct, complete, clear, neat. Floor type distribution box installation position ion, and the transfer box base, handholes, supporting the installation of. The height of the base can be decided according to the situation of each area. 300mm is suitable for the rain height.  

4 transfer box base distance handholes, usually not more than 10 meters, but must be galvanized steel or plastic pipe laying, shall not be used in small channels.

5 junction box foundation casting: junction box foundation requirements for 10cm thick, 150# concrete foundation, before pouring foundation should clean up the debris.    

6 transfer box foundation: masonry brick masonry with labeled 100# mortar, masonry mortar saturation is not the end of the 80%, around the corner, the window, you need to cast horoscopes, wall width is

24cm.  

7 base mortar: plaster with no special circumstances generally use the label for 100# in plaster mortar, thickness 1.5cm, external plastering plastering wall thickness 2cm, close, compact and smooth, no hollowing, no fly thorn, no fault. If there are special circumstances such as well water around, to increase the grade of cement and thickening outside or leak preventive group.      

8 base embedded iron nail: specifications and location to meet the design requirements, at the base of the transfer box on the four corners of the pre cast anchor bolts (bolts M12X30) good for fixing the transfer box. And in the base of the central reserve a rectangular hole (822mm * 622mm) for the entrance and exit of the optical cable.

9 junction box and the base contact, should be wiped"Eight ash", to prevent water.