{"L1_core": {"type": "utp", "domain": "networking", "category": "cable", "subcategory": "shielding_type"}, "L4_features": ["no_shielding", "low_cost", "easy_installation", "office_environment"], "L3_standards": ["TIA/EIA-568", "ISO/IEC 11801"], "L2_performance": {"shielding": "none", "impedance_ohms": 100}}