The JBX42638 6-meter SC/APC to LC/UPC duplex singlemode fiber patch cable represents a cost-effective solution for telecommunications professionals, data center technicians, and network engineers requiring reliable fiber optic connectivity. **Technical Specifications:** This cable features dual 9/125 singlemode fiber strands with G.657.A1 glass composition, delivering exceptional performance characteristics. The SC/APC connectors on one end and LC/UPC connectors on the other provide Type A to B crossover polarity—the industry standard for duplex patch cord applications. With insertion loss measurements of ≤0.35dB (typical 0.15dB) and return loss exceeding 20dB, this cable maintains signal integrity across long transmission distances. **Performance & Compliance:** Attenuation testing confirms performance of 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm, meeting stringent ANSI/TIA/EIA-455-171-A-2001 standards. The yellow OFNR riser-rated jacket provides both flame resistance and durability in building installations. TAA compliance ensures this product meets U.S. government procurement requirements, while RoHS/ELV certification demonstrates environmental responsibility. **Construction & Design:** The 1.8mm outside diameter provides excellent bend radius characteristics and simplifies cable management in congested environments. The duplex configuration with Type A to B crossover polarity eliminates the need for specialized adapters in most standard networking applications. **Applications:** Ideal for connecting optical transceivers, switches, and network equipment in campus networks, data centers, telecommunications hubs, and enterprise installations. The 6-meter length accommodates standard rack-to-distribution-frame distances. **Warranty & Support:** Backed by a 90-day limited warranty. Custom lengths are available for specific installation requirements. Ships from multiple U.S. locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99. **Maintenance:** Regular inspection of connector end faces ensures optimal performance. Store in clean, dust-free environments to maximize connector longevity.