The JBX42121 1-meter SC/APC to SC/UPC duplex single-mode fiber patch cable represents a critical component for modern high-speed network infrastructure. Engineered to meet rigorous industry standards, this cable delivers exceptional optical performance while maintaining TAA compliance for government and institutional procurement requirements. **Technical Specifications:** The cable features a dual-strand duplex configuration utilizing 9/125 single-mode fiber with G.657.A1 glass composition. This specification ensures compatibility with standard telecommunications wavelengths (1310nm and 1550nm) with remarkably low attenuation rates—0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm. Typical insertion loss of just 0.15dB with a maximum of 0.35dB guarantees minimal signal degradation over the 1-meter span. **Performance Characteristics:** The SC/APC to SC/UPC Type A to B crossover configuration represents the industry-standard polarity pairing for duplex patch cords. Return loss specifications of ≥20dB provide excellent signal integrity, critical for high-speed data transmission. All optical performance measurements comply with ANSI/TIA/EIA-455-171-A-2001 standards, ensuring predictable, reliable operation. **Installation & Safety:** With an outside diameter of just 1.8mm, this cable facilitates easy routing through existing cable infrastructure and overhead trays. The OFNR (Optical Fiber Non-conductive Riser) rating means the jacket meets UL1666 fire safety requirements, making it suitable for installation in vertical runs between building floors without additional conduit. **Applications:** Perfect for data center cross-connections, telecommunications carrier installations, enterprise LANs, and any environment requiring duplex single-mode fiber connectivity. The yellow jacket provides excellent visibility during installation and maintenance. **Availability & Support:** Available in custom lengths beyond the standard 1m configuration. Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99. Backed by a 90-day limited warranty and RoHS/ELV compliant materials. TAA certification ensures eligibility for government and institutional projects.