The JBX42617 30m FC/APC to ST/UPC duplex singlemode fiber patch cable represents enterprise-class connectivity for mission-critical network environments. Engineered for telecommunications, data centers, and advanced networking applications, this cable combines precision engineering with proven reliability. **Technical Excellence:** This duplex cable utilizes 9/125 G.657.A1 singlemode glass fiber, the industry standard for long-distance, high-bandwidth signal transmission. With attenuation specifications of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm, it minimizes signal degradation across extended distances. The insertion loss specification of ≤0.35dB (typical 0.15dB) and return loss of ≥20dB ensure optimal signal integrity and system performance. **Connector Configuration:** The FC/APC to ST/UPC connectivity provides Type A to B crossover polarity, the industry-standard configuration for duplex patch cords. This proven configuration eliminates compatibility issues and simplifies network design. **Build Quality & Compliance:** The 1.8mm outer diameter yellow jacketing provides both visibility and durability in cable management systems. OFNR (Riser Rated) certification ensures safe installation in vertical cable runs. Full RoHS/ELV and TAA compliance make this cable suitable for government contracts and regulated industries. Standards testing per ANSI/TIA/EIA-455-171-A-2001 guarantees performance consistency. **Practical Advantages:** The 30-meter length accommodates longer cable runs common in large facilities. Custom length options are available for specialized deployments. Free standard shipping on orders exceeding $99 reduces procurement costs. A 90-day limited warranty provides peace of mind on your investment. **Applications:** Ideal for fiber-to-the-desktop (FTTD) implementations, telecommunications infrastructure upgrades, data center interconnects, high-speed LAN installations, and any application requiring reliable singlemode fiber connectivity. The crossover configuration makes it particularly suitable for interconnecting different equipment types within heterogeneous network environments. **Sourcing:** Available from multiple distribution centers (Danville CA, Fort Worth TX, Beaufort SC) for rapid delivery. Manufactured to consistent standards across Taiwan, US, and China facilities.