The JBX42467 40-meter FC/APC to FC/APC duplex singlemode fiber patch cable represents a reliable solution for professional fiber optic network installations. Designed to meet rigorous telecom industry standards, this cable delivers exceptional performance characteristics ideal for long-distance signal transmission in enterprise, carrier, and data center environments. **Key Technical Specifications:** This duplex configuration features dual 9/125 micron singlemode fiber strands, each terminated with precision FC/APC connectors. The APC (Angled Physical Contact) design minimizes back reflections and ensures return loss ≥20dB, critical for maintaining signal integrity in sensitive applications. With measured insertion loss of ≤0.35dB (typically 0.15dB), the cable exhibits exceptional low-loss characteristics at both 1310nm and 1550nm wavelengths. **Performance & Durability:** Manufactured to ANSI/TIA/EIA-455-171-A 2001 standards, each cable undergoes rigorous attenuation testing. The G.657.A1 glass fiber specification provides superior bend performance while maintaining singlemode propagation characteristics. The OFNR (Optical Fiber Non-conductive Riser) rated jacket offers fire safety compliance for indoor riser cable runs, while the 1.8mm compact diameter minimizes space requirements in dense cable trays. **Compliance & Availability:** This TAA-compliant cable meets U.S. procurement requirements for federal projects. The Type A to B crossover polarity configuration is industry-standard for duplex patch cord applications. Custom lengths are available for specialized installations. Ships from multiple U.S. locations (California, Texas, South Carolina) with free standard shipping on orders exceeding $99. Backed by a 90-day limited warranty. **Applications:** Ideal for backbone cabling, long-span telecommunications links, data center interconnects, and DWDM system deployments where low-loss, high-return-loss performance is essential.