The Low Bend Sensitivity Single-Mode Optical Fiber (ITU-T G. 657 A2) is produced using the advanced Complete Chemical Synthesis method. Therefore, the fiber has an excellent attenuation coefficient, low peak water and good transmission performance. “Leviton is dedicated to designing, developing and manufacturing sustainable high performance structured cabling and specialty cabling solutions. It can transmit in O-E-S-C-L for the entire band. Used for optical cables and indoor environments, G657A2 optical fiber is a single mode fiber (SM), which allows less signal dispersion, with low sensitivity to curvature. Among these, commonly used standards are G. This article intends to provide a clear explanation of G.