The JBX42579 7-meter ST/APC to FC/APC duplex singlemode fiber patch cable represents a premium solution for optical network infrastructure requiring exceptional reliability and performance. This professional-grade interconnect component is engineered to meet demanding telecommunications and data center specifications. **Technical Excellence** Constructed with 9/125 singlemode fiber and G.657.A1 glass composition, this cable delivers superior optical performance. Attenuation testing conforms to ANSI/TIA/EIA-455-171-A-2001 standards, with measured performance of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm wavelengths. The duplex configuration enables simultaneous bidirectional signal transmission, maximizing bandwidth efficiency in complex network topologies. **Connector Specifications** The ST/APC to FC/APC connector configuration with Type A to B crossover polarity represents the industry standard for duplex patch cord applications. Both connector types feature angle-polished (APC) ferrules, reducing return loss to ≥20dB for cleaner signal integrity and improved system performance. **Installation & Durability** The 1.8mm outside diameter yellow OFNR riser-rated jacket provides flame resistance and durability for in-building backbone cabling. The 5.0mm width specification ensures compatibility with standard cable management systems. Compliant with RoHS/ELV directives and TAA regulations, making this cable suitable for government and institutional procurement processes. **Versatile Applications** Ideal for telecommunications networks, data center infrastructure, laboratory testing environments, and enterprise backbone cabling. The 7-meter length accommodates typical building distribution distances while custom lengths are available for specialized installations. **Quality Assurance** Backed by a comprehensive 90-day limited warranty and manufactured to stringent quality standards in Taiwan, United States, or China facilities. Benefit from free standard shipping on orders exceeding $99, with distribution from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) ensuring rapid delivery.