The JBX42585 ST/APC to FC/APC duplex singlemode fiber patch cable represents a critical component for modern optical networking infrastructure. Measuring 20 meters in length with a distinctive yellow jacket for easy identification, this cable bridges connectivity between different fiber optic connector types commonly found in telecommunications equipment. **Technical Excellence** Constructed with 9/125 G.657.A1 glass fiber, this cable meets rigorous performance standards. The APC (Angled Physical Contact) connectors on both ends provide superior return loss characteristics (≥20dB) compared to standard connectors, minimizing signal reflection and ensuring clean data transmission. Pre-tested insertion loss of ≤0.35dB (typically 0.15dB) guarantees minimal signal attenuation across critical wavelengths: 0.25dB/km at 1310nm and 0.35dB/km at 1550nm. **Compliance and Safety** Fully TAA (Trade Agreements Act) compliant, this cable meets government contracting requirements. RoHS/ELV directives compliance ensures environmental safety and reduced hazardous substances. The OFNR (Optical Fiber Non-Conductive Riser-rated) jacketing qualifies this cable for installation in building risers and vertical cable runs without additional conduit. **Practical Applications** Ideal for data center interconnections, telecommunications facilities, and enterprise network upgrades. The duplex configuration enables simultaneous bidirectional communication, while Type A to B crossover polarity is optimized for most duplex patch cord applications. The 1.8mm diameter provides excellent flexibility for cable routing in congested environments. **Custom Solutions Available** While this product offers a standard 20-meter length, custom lengths are available to match specific installation requirements, reducing waste and ensuring optimal cable management. **Shipping and Support** Qualifies for free standard shipping on orders exceeding $99, with multiple fulfillment locations (Danville CA, Fort Worth TX, Beaufort SC) ensuring rapid delivery. Comprehensive 90-day limited warranty provides peace of mind for enterprise deployments. **Specifications Summary** - Connector Type: ST/APC to FC/APC - Fiber Configuration: Duplex (Two strands) - Fiber Grade: 9/125 Singlemode G.657.A1 - Length: 20 meters (custom lengths available) - Insertion Loss: ≤0.35dB typical 0.15dB - Return Loss: ≥20dB - Jacket Rating: OFNR Riser - Color: Yellow (identification) - Warranty: 90 days limited This cable represents the optimal choice for professionals demanding reliability, performance, and standards compliance in fiber optic installations.