Visual inspection identifies contamination, scratches, cracks, and endface defects that directly affect optical performance. Insertion loss testing measures the total optical loss of a fiber. ABSTRACT: The paper presents the analysis and diagnosis of cables for data transmission in telecommunications. Fiber design and transmission technology have collaboratively evolved to increase bandwidth. While a small percentage, we can examine the “intrinsic” cable failures and what is done to prevent. School of Mathematics and Statistics, Hainan University, Haikou 570228, China Author to whom correspondence should be addressed. To improve the long-term reliability. As environments are becoming increasingly harsh, the ability of optical fiber cable to withstand such environments is of the utmost importance to outside plant users. Macrobends are larger-scale curves where the cable bends beyond its minimum bend radius, causing light to leak out of the core. Consequences Prevention Adhere to manufacturer's bend-radius. In August of 1999, Boeing Corporation (Boeing) engineers being used on International Space Station flight a defect in the glass fiber (see Figure 1, “Rocket and NASA engineers and managers, Boeing created and reliability of the cable installed in the U. Technologies and Radiation Effects.