... scar, No spot 3 Insertion loss dB SM ≤ 0.2, 4 Return loss dB APC ≥ 60 5 Curvature eccentricity ... um <50 6 Fiber core undercut um - <50 7 Fall apart test dB ... Return loss change< 5,No flab,No distortion 11 Addition dB 2.5Kg , 200times , 10times/minutes , ± 80 °Insertion ... ≤ 0.20dB, Return loss UPC≥ 50 dB, APC≥ 60 dB Radius of curvature nm 10 ≤ R ≥ ...