The JBX85085 55-meter LC/ST duplex singlemode fiber patch cable represents a premium solution for professional networking applications requiring reliable, high-speed optical connectivity. This cable combines advanced fiber optic technology with practical engineering to meet demanding telecommunications and data center requirements. **Technical Specifications:** Featuring a 9/125 micrometer singlemode core, this duplex cable excels in long-distance signal transmission. The G.657.A1 grade glass fiber ensures optimal performance across standard telecommunications wavelengths (1310nm: 0.25dB/km attenuation; 1550nm: 0.35dB/km attenuation). With an outside diameter of just 1.8mm, the cable offers flexibility for routing through cable trays and conduits. **Performance Metrics:** Insertion loss measures ≤0.35dB (typical 0.15dB), while return loss exceeds 20dB—specifications tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards. These metrics guarantee signal fidelity essential for mission-critical applications. **Construction & Safety:** The yellow OFNR (Optical Fiber Non-conductive Riser-rated) jacket provides fire safety compliance for building installations. Type A to B crossover polarity configuration is industry-standard for duplex patch cord applications. UPC-polished LC and ST connectors deliver superior optical performance. **Applications:** Ideal for telecommunications facilities, data center expansions, ISP backbone networks, university campuses, and enterprise installations. The 55-meter length accommodates longer horizontal runs while maintaining signal quality. **Quality Assurance:** RoHS and ELV compliant for environmental responsibility. Each cable includes a 90-day limited warranty. Custom lengths available for specialized installations. Ships from multiple US locations with free standard shipping on orders over $99. **Why Choose This Cable:** Professional-grade construction, proven performance standards, and competitive pricing make this the ideal choice for network professionals seeking reliability without compromise.