The JBX42135 20-meter SC/APC to SC/UPC Duplex Single Mode Fiber Patch Cable represents professional-grade telecommunications infrastructure designed for demanding network environments. This duplex fiber optic cable features a 9/125 micrometer single mode core with G.657.A1 glass fiber specifications, making it suitable for long-distance, high-bandwidth data transmission. **Technical Excellence:** Engineered to strict ANSI/TIA/EIA-455-171-A-2001 standards, the cable delivers exceptional performance metrics: insertion loss of ≤0.35dB (typical 0.15dB), return loss of ≥20dB, and attenuation of 0.25 dB/km at 1310nm or 0.35 dB/km at 1550nm. These specifications ensure minimal signal degradation over the full 20-meter length, critical for maintaining data integrity in telecommunications and data center applications. **Connector Configuration:** The SC/APC to SC/UPC configuration with type A to B crossover polarity is the industry-standard setup for duplex patch cords. This combination provides compatibility with most network equipment while maintaining optimal signal performance. **Installation & Compliance:** The 1.8mm diameter cable features OFNR (riser-rated) PVC jacketing in high-visibility yellow, meeting safety codes for installation in building risers and vertical runs. TAA (Trade Agreements Act) compliance ensures this product meets government procurement requirements. RoHS/ELV compliance demonstrates environmental responsibility. **Applications:** Perfect for telecom facilities, data centers, server rooms, network closets, and fiber-to-the-premises (FTTP) installations. The duplex configuration allows simultaneous bidirectional communication, making it essential for full-duplex network protocols. **Quality & Support:** Backed by a 90-day limited warranty and featuring free standard shipping on orders exceeding $99. Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) ensuring rapid delivery. Available in custom lengths for specialized installations. Invest in reliable fiber connectivity with the JBX42135—where professional-grade performance meets industry compliance.