101 describes characteristics, construction and test methods of optical fibre cables for buried application. Note that Recommendation ITU-T L. Direct-burial fiber cable eliminates the need for continuous conduit runs and can be faster and more cost-effective on long, open runs. The following formulas may be used to determine general guidelines for installing Corning Optical Communications fiber optic cable; however, refer to the cable specifi simply double the minimum working bend radius. Match trench method with the correct underground fiber structure (GYTS, GYTA53, GYTY53, micro-duct). Conducting Site Surveys and Environmental Assessments Before Construction Conduct a thorough site survey before construction begins.