The JBX42733 ST/APC to LC/UPC duplex singlemode fiber patch cable represents professional-grade connectivity for mission-critical networking infrastructure. This 12-meter cable combines precision engineering with reliable performance, making it an essential component for telecommunications, data centers, and enterprise networks. **Technical Excellence** Constructed with a 9/125 singlemode core and G.657.A1 glass fiber, this cable meets rigorous industry standards for optical signal transmission. Attenuation testing confirms performance at 1310 nm (0.25 dB/km) and 1550 nm (0.35 dB/km), ensuring minimal signal loss across the optical spectrum. The ≤0.35dB insertion loss and ≥20dB return loss provide superior signal quality for sensitive applications. **Connector Configuration** The ST/APC to LC/UPC configuration with Type A to B crossover polarity enables seamless integration into mixed-connector environments. The duplex design supports full-duplex communication, transmitting and receiving signals simultaneously over separate fiber strands. **Installation & Safety** The 1.8mm outside diameter yellow OFNR riser-rated jacket meets building codes for safe in-wall installation while providing excellent visibility and identification. The durable plastic accessories and robust construction withstand demanding installation conditions. **Compliance & Standards** TAA compliant and manufactured to ANSI/TIA/EIA-455-171-A-2001 standards, this cable meets government procurement requirements. RoHS/ELV directive compliance ensures environmental responsibility. **Flexibility & Support** Available in custom lengths for specific deployment needs, with fast shipping from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC). Free standard shipping on orders over $99, backed by 90-day limited warranty and responsive customer support. **Applications** Ideal for fiber-to-the-desk deployments, backbone connections, telecommunications equipment interconnection, and laboratory testing environments requiring reliable single-mode performance.