SNS constitutes passive slope protection network 
 The system consists of a fixed system (anchor, anchor rope, dock and support rope), wire rope, steel columns vacuum ring and four main parts. 
 (1) steel column and fixed systems. Works with steel columns, pillars and the base of the movable hinge between the links used to ensure that the steel column base when subjected to direct impact will not be damaged anchor bolts; connected with the flexible anchor rope double strand wire rope anchor, and its embedded sets of heart-shaped ring or casing ring designed to absorb high impact loads well; 
 (2) wire rope. Steel wire rope is a component of the main features of the system, it must come from the impact of falling rocks support the load transfer to the rope, anchor rope and other parts and eventually passed to the anchor. 
 (3) vacuum ring. Vacuum ring is played on the system load in order to avoid serious damage to other parts of the important parts. When connected with the vacuum ring pull rope suffered a certain degree, the decompression loop start and to absorb energy through deformation, in order to achieve overload protection.