A practical, engineering-focused guide to planning and installing underground fiber optic cables with the right cable structure, trench design and protection level for long-life, low-risk networks. 101 describes characteristics, construction and test methods of optical fibre cables for buried application. Note that Recommendation ITU-T L. Match trench method with the correct underground fiber structure (GYTS, GYTA53, GYTY53, micro-duct). This guide explains the common cable constructions, when to choose direct-burial, a practical installation workflow, and the best practices that minimize downtime and future repair costs. Split cable guides and split 40-in sheave wheels are avail ble to facilitate entry and exit from manholes. Lip rollers and quadrant blocks must not be used because the rollers themselves d not meet the minimum bend radiu req go under obstacles like. The burial depth of the direct-buried optical cable shall meet the relevant provisions of the engineering design requirements of the communication optical cable line, and the specific burial depth shall meet the requirements in the table below.
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