The JBX88419 40-meter ST/ST duplex singlemode fiber patch cable represents a premium solution for professional-grade optical fiber networking. Engineered for high-performance applications requiring long-distance signal transmission, this cable combines reliability with regulatory compliance. **Technical Excellence** Built with 9/125 singlemode fiber core and G.657.A1 glass fiber specifications, this cable minimizes signal degradation over the full 40-meter span. The measured attenuation of 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm ensures optimal performance across standard telecommunications wavelengths. With insertion loss of just 0.15dB typical (≤0.35dB maximum) and return loss exceeding 20dB, signal integrity remains exceptional, reducing the need for signal amplification or regeneration. **Compliance & Certification** TAA compliance makes this cable ideal for government and institutional projects requiring domestic content verification. RoHS/ELV certification ensures environmental responsibility and adherence to international safety standards. Testing performed to ANSI/TIA/EIA-455-171-A-2001 standards provides assurance of quality and consistency. **Construction & Installation** The 1.8mm outer diameter provides excellent flexibility, accommodating tight conduit runs and wall installations without compromising durability. OFNR (Fiber Optic Nonconductive Riser) jacketing classification ensures the cable meets building code requirements for plenum and riser installations. The distinctive pink jacket aids in network documentation and visual management, simplifying maintenance and troubleshooting procedures. **Connector Configuration** ST/UPC connectors with Type A to B crossover polarity enable standard duplex communications, supporting both transmit and receive fiber paths simultaneously. The UPC (Ultra Physical Contact) polish ensures minimal back reflection and maximum performance. **Applications & Benefits** Ideal for data center expansions, campus backbone networks, telecommunications infrastructure, and enterprise fiber-to-the-desktop deployments. Custom lengths available for specialized projects. Backed by 90-day limited warranty and free standard shipping on orders exceeding $99, providing immediate cost savings and rapid deployment capabilities.