had 1/2/3 window for choose Package Type Illustration 1,S= bare fiber 2,M= mini package 3,B= ABS package 4,L= 1U inches rack 5,Z= plug-in type Package Type Illustration 1,S= bare fiber 2,M= mini package 3,B= ABS package 4,L= 1U inches rack 5,Z= plug-in type FBT Optical Splitter