The JBX88376 4-meter ST/ST duplex singlemode fiber patch cable represents a reliable, standards-compliant solution for professional fiber optic network installations. With meticulous attention to performance specifications and regulatory compliance, this cable meets the demanding requirements of telecommunications carriers, enterprise data centers, and service providers. **Technical Excellence** This duplex patch cable features industry-standard ST/UPC connectors with Type A to B crossover polarity configuration, the most common setup for duplex installations. The 9/125 micron singlemode core delivers exceptional signal clarity over extended distances with attenuation rates of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm—well within industry standards. Measured insertion loss of ≤0.35dB (0.15dB typical) and return loss ≥20dB ensure minimal signal degradation and excellent system performance. **Superior Construction** The cable incorporates G.657.A1 grade glass fiber, specifically engineered for bend-insensitive performance without compromising optical quality. The compact 1.8mm outside diameter and flexible plastic accessories facilitate easy installation and routing through existing conduit systems and cable trays. OFNR riser rating ensures compliance with building codes and fire safety requirements in commercial environments. **Compliance and Certification** Fully TAA-compliant for government and federal procurement programs. Meets RoHS/ELV directives (EU 2002/95/EC) and has been attenuation-tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards. Backed by a comprehensive 90-day limited warranty. **Versatile Applications** Ideal for telecommunications infrastructure, data center interconnects, fiber-to-the-premises deployments, and enterprise network backbone connections. The distinctive purple jacket aids visual cable management and identification. **Available Options** Custom lengths available upon request to match your exact installation requirements. Distributed from multiple US locations for expedited delivery. Free standard shipping on orders over $99.