{"L1_core": {"type": "sftp", "domain": "networking", "category": "cable", "subcategory": "shielding_type"}, "L4_features": ["double_shielding", "individual_pair_foil", "overall_braid", "maximum_emi_protection", "cat7_cat8"], "L3_standards": ["ISO/IEC 11801"], "L2_performance": {"shielding": "individual_foil_plus_overall_braid", "also_known_as": "PiMF", "impedance_ohms": 100}}