The selective examination on the basis of the CengJiaoShi communication outdoor optical cable YD/T901-2009 standards and related products such as the current effective enterprise standards and the express quality requirements, product cable structure integrity of communication optical cable products, identify chromatography (fiber recognition chromatography, pine casing chromatography), the structure of the fiber optic cable size (pine casing diameter and wall thickness, inner bushing, the thickness of sheath and the outer covering, is applied to longitudinally wrap overlapping metal band width), fiber length, fiber characteristics (size parameter and mode field diameter, cutoff wavelength, attenuation coefficient of inhomogeneity, discontinuity and decay, additional attenuation, dispersion wavelength), sheath performance (metal, electrical conductivity of tidal and armoured layer connectivity, bonded sheath peel strength, aging before and after the sheath tensile strength and elongation at break, heat shrinkage rate, resistance to environmental stress cracking) mechanical properties, optical cable, optical cable environmental performance (attenuation temperature characteristic, drip performance, polyethylene sheath integrity, porous, bending performance under low temperature, low temperature impact performance), cable markers (meter) symbol error 9 class 28 projects such as the inspection.
Spot checks found that there are five kinds of products do not comply with the provisions of the standard, involving vertical overlapping metal band width, mechanical properties, fiber optic cable pine casing diameter and wall thickness, the sheath before and after aging tensile strength and elongation at break, permeable performance project.