The JBX42501 50-meter ST/APC to ST/UPC duplex singlemode fiber patch cable represents a premium networking solution for enterprises, data centers, and telecommunications professionals seeking reliable, high-performance fiber optic connectivity. This cable is engineered to meet the most stringent requirements of modern network infrastructure while maintaining cost-effectiveness and ease of installation. **Key Technical Features:** Constructed with 9/125 singlemode fiber cores and G.657.A1 glass specifications, this duplex cable excels in low-attenuation signal transmission. Testing confirms insertion loss of just ≤0.35dB (typical 0.15dB) and return loss of ≥20dB, ensuring signal integrity across both 1310nm and 1550nm wavelengths. These specifications guarantee compatibility with long-distance telecommunications systems and high-speed data applications. **Design & Durability:** The bright yellow OFNR-rated jacket provides excellent visibility for cable identification and management while meeting riser-rated fire safety standards. The compact 1.8mm outside diameter facilitates routing through tight cable trays and conduit systems. Type A to B crossover polarity configuration makes this cable the standard choice for most duplex patch cord applications. **Compliance & Certification:** This product is fully TAA compliant, meeting government procurement requirements. RoHS/ELV directive compliance ensures environmental responsibility. Manufactured in Taiwan, the United States, or China with stringent quality controls, each cable undergoes attenuation testing per ANSI/TIA/EIA standards. **Practical Applications:** Ideal for campus network backbone connections, data center connectivity, telecommunications infrastructure, and long-distance signal transmission. The 50-meter length accommodates building-to-building connectivity and extensive cable runs without signal compromise. **Custom Solutions:** Custom lengths are available for specialized installations. Free standard shipping on orders over $99, with distribution centers in California, Texas, and South Carolina ensuring rapid delivery. 90-day limited warranty provides additional peace of mind for critical network investments.