China Railway Construction Co.,ltd is a mega construction enterprise, one of the world's most powerful, large-scale mega integrated construction group, "Fortune" "World's Top 500 Enterprises" ranked 43rd, has been listed in Shanghai and Hong Kong (A-share code 601186, H-share code 1186). This case is a branch office building intelligent building control, including conference rooms, reception rooms, halls, offices and other areas. Central enterprises are very strict on data security without exception, requiring that all intelligent control must be based on local LAN.