The JBX42589 ST/APC to FC/APC duplex singlemode fiber patch cable represents a premium connectivity solution for telecommunications, data centers, and enterprise network infrastructure. This 40-meter cable combines exceptional optical performance with robust physical construction, making it ideal for challenging installation environments. Optical Performance & Specifications: Built with a 9/125 singlemode core and G.657.A1 glass fiber, this cable delivers impressive optical characteristics. Insertion loss is rated at ≤0.35dB (typical 0.15dB), while return loss exceeds 20dB. Attenuation specifications meet industry standards at both 1310 nm (0.25 dB/km) and 1550 nm (0.35 dB/km) wavelengths. Every cable undergoes rigorous attenuation testing per ANSI/TIA/EIA-455-171-A-2001 standards before shipment. Connector Technology: The ST/APC to FC/APC connector configuration with Type A to B crossover polarity ensures compatibility with diverse network equipment. APC (angled physical contact) connectors minimize back reflection, reducing signal loss and improving overall system performance compared to standard PC connectors. Compliance & Safety: TAA-compliant certification makes this cable suitable for federal government and GSA schedule purchases. RoHS/ELV directive compliance ensures environmental responsibility. The OFNR (Optical Fiber Nonconductive Riser Rated) jacket provides fire-rated protection for installations running through building risers and plenum spaces. Physical Characteristics: The 1.8mm outside diameter and durable yellow jacket facilitate easy identification and routing in complex cable environments. The duplex construction with two fiber strands enables full-duplex communication in a single compact cable. Shipping & Support: Qualify for free standard shipping on orders exceeding $99. Ships from multiple US locations (California, Texas, South Carolina) for fast delivery. Custom lengths are available for specialized applications. The 90-day limited warranty provides peace of mind for your investment. Manufactured in Taiwan, US, or China with consistent quality standards across all sources.