{"L1_core": {"type": "ftp", "domain": "networking", "category": "cable", "subcategory": "shielding_type"}, "L4_features": ["overall_foil_shield", "emi_protection", "grounding_required", "drain_wire"], "L3_standards": ["TIA/EIA-568", "ISO/IEC 11801"], "L2_performance": {"shielding": "overall_foil", "also_known_as": "F/UTP", "impedance_ohms": 100}}