652 fiber optic cable and 655 fiber optic cable
652 is the standard single-mode fiber used in access and metro networks, optimized for 1310 nm transmission with normal dispersion at 1550 nm, while G. Each fiber type is engineered with different refractive index profiles, dispersion properties, and bending performance to support specific applications—from long-distance. 657A2 on fiber cable specifications, you're looking at international standards defined by the ITU-T (International Telecommunication Union – Telecommunication Standardization Sector).
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