The JBX43636 ST/APC to LC/UPC Simplex Singlemode Fiber Patch Cable represents professional-grade connectivity for demanding telecommunications and data center environments. At 4 meters in length, this cable bridges equipment separated by moderate distances while maintaining superior signal integrity. **Technical Excellence:** Features a 9/125 micron singlemode core designed specifically for long-distance transmission with exceptional performance characteristics. The insertion loss specification of ≤0.35dB (0.15dB typical) ensures minimal signal degradation, while the return loss of ≥20dB provides excellent connector performance. Operating wavelengths at both 1310 nm and 1550 nm are supported with attenuation ratings of 0.25 dB/km and 0.35 dB/km respectively, making this cable suitable for diverse network architectures. **Robust Construction:** The cable features a 1.8mm outside diameter with OFNR (Optical Fiber, Nonconductive, Riser-rated) jacketing, providing flame-resistant protection in building installations. The yellow jacket offers high visibility for easy cable identification in complex installations. The G.657.A1 glass fiber specification ensures compatibility with tight-radius applications while maintaining performance. **Compliance & Standards:** TAA compliant for government procurement, RoHS/ELV certified per EU Directive 2002/95/EC, and tested according to ANSI/TIA/EIA-455-171-A standards. This ensures suitability for regulated environments including federal projects and enterprises with strict compliance requirements. **Practical Benefits:** Simplified connector compatibility between ST/APC and LC/UPC equipment without requiring additional adapters. The straight-through polarity design ensures straightforward installation. Available in custom lengths for exact project specifications. Free standard shipping on orders exceeding $99, with multiple domestic fulfillment locations ensuring rapid delivery. **Applications:** Ideal for telecommunications networks, data center interconnections, enterprise network installations, and broadcast facilities where reliable singlemode connectivity is essential. The 90-day limited warranty provides peace of mind for critical installations.