The JBX88421 50-meter ST/ST duplex singlemode fiber patch cable represents the gold standard in optical connectivity for professional networking environments. Built with precision-engineered 9/125 singlemode fiber cores, this cable delivers ultra-low attenuation performance suitable for long-distance, high-bandwidth applications spanning data centers, telecommunications facilities, and enterprise networks. **Key Performance Features:** This cable achieves exceptional signal quality with insertion loss specifications of ≤0.35dB at 0.15dB typical, and return loss rated at ≥20dB. Operating across standard telecommunications wavelengths (1310nm and 1550nm), attenuation is minimized at 0.25 dB/km and 0.35 dB/km respectively. The G.657.A1 glass fiber construction ensures bend-insensitive performance while maintaining the superior transmission characteristics of standard singlemode fiber. **Professional-Grade Construction:** The duplex configuration with Type A to B crossover polarity enables simultaneous bidirectional communication—the industry standard for patch cord applications. The OFNR riser-rated jacket provides flame resistance suitable for in-building cable runs, while the 1.8mm diameter allows easy routing through cable trays and tight spaces. Pink jacket identification aids network administrators in quick visual recognition and cable management organization. **Compliance & Reliability:** Fully TAA-compliant for government procurement requirements, this cable meets EU RoHS/ELV directives. Rigorous testing to ANSI/TIA/EIA-455-171-A-2001 standards ensures consistent, reliable performance. The 90-day limited warranty provides peace of mind for critical installations. **Applications:** Ideal for connecting fiber optic network equipment, telecommunications infrastructure, data center patch panel connections, and long-distance signal transmission. The 50-meter length accommodates large facility spans while maintaining signal fidelity. Custom lengths are available for specialized installation requirements. Backed by domestic fulfillment from multiple US locations with free standard shipping on orders exceeding $99.