{"L1_core": {"type": "cat5e", "domain": "networking", "category": "cable", "subcategory": "twisted_pair"}, "L4_features": ["gigabit_ethernet", "backward_compatible", "improved_crosstalk"], "L3_standards": ["TIA/EIA-568-B.2", "ISO/IEC 11801 Class D"], "L2_performance": {"awg": 24, "pairs": 4, "speed_gbps": 1, "frequency_mhz": 100, "max_distance_m": 100}}