The JBX42557 30-meter ST/APC to FC/UPC duplex singlemode fiber patch cable represents premium optical connectivity for professional network infrastructure. This cable combines robust construction with precise engineering to deliver consistent, reliable fiber signal transmission in mission-critical applications. Key Technical Specifications: The cable features a 9/125 singlemode core designed for long-distance, high-bandwidth telecommunications. With G.657.A1 glass fiber composition, it supports both standard and bend-insensitive applications. Measured insertion loss of ≤0.35dB ensures minimal signal degradation, while return loss ≥20dB prevents reflection-induced interference. Performance is validated at both 1310nm and 1550nm wavelengths, accommodating diverse telecom and data center requirements. Connector Configuration: ST/APC connectors feature angled physical contact for superior return loss performance, while FC/UPC connectors provide straight physical contact reliability. The Type A to B crossover polarity is the industry standard for duplex patch cords, simplifying installation and reducing compatibility issues. Compliance & Durability: TAA compliance ensures government procurement eligibility, while RoHS/ELV certification meets environmental standards. The 1.8mm diameter yellow OFNR-rated jacket provides riser-rated flame resistance without compromising flexibility. The cable ships in protective 10x10x10 packaging and undergoes testing per ANSI/TIA/EIA-455-171-A standards. Applications: Ideal for data centers, telecommunications facilities, university networks, and enterprise installations requiring reliable single-mode fiber connectivity. The 30-meter length accommodates medium-distance runs within buildings or between adjacent facilities. Customization & Support: Available in custom lengths for specific project requirements. Free standard shipping on orders exceeding $99, with shipments from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC). 90-day limited warranty provides purchase confidence.