The JBX42645 20-meter SC/APC to LC/UPC duplex singlemode fiber patch cable represents a robust solution for professional fiber optic networking applications. This cable is specifically engineered to meet the stringent requirements of modern telecommunications and data center infrastructure. **Key Technical Specifications:** Constructed with a 9/125 micrometer singlemode core, this cable supports long-distance, single-mode transmission at operating wavelengths of 1310nm and 1550nm. The attenuation characteristics (0.25 dB/km at 1310nm, 0.35 dB/km at 1550nm) ensure minimal signal loss over extended runs. With an insertion loss specification of ≤0.35dB and typical performance of 0.15dB, this cable exceeds industry expectations for low-loss interconnections. **Durability and Compliance:** The yellow OFNR (Optical Fiber Non-conductive Riser) rated jacket provides flame-resistant protection suitable for in-building vertical runs and plenum environments. With a 1.8mm outside diameter and robust plastic accessories, the cable withstands installation stresses and environmental challenges. Full RoHS/ELV compliance and TAA (Trade Agreements Act) certification ensure regulatory compliance for government and enterprise procurement. **Connector Configuration:** The SC/APC (angled physical contact) connectors on one end and LC/UPC (ultra-physical contact) connectors on the other provide Type A to B crossover polarity—the industry standard for duplex patch cord applications. This configuration eliminates the need for additional adapter cables in most installations. **Practical Applications:** Ideally suited for connecting telecommunications equipment, network switches, and optical transceivers in data centers, campus networks, and carrier facilities. The 20-meter length accommodates medium-distance backbone and distribution runs. **Warranty and Support:** Backed by a 90-day limited warranty, with convenient shipping from multiple US locations and free standard shipping on orders exceeding $99. Custom lengths available upon request for specialized installation requirements. Standards-tested attenuation ensures reliable performance meeting ANSI/TIA/EIA-455-171-A specifications.