The JBX43766 4m LC/UPC to ST/APC Simplex Singlemode Fiber Patch Cable represents premium connectivity for demanding telecommunications and network infrastructure applications. This professionally engineered solution combines precision manufacturing with proven performance standards. **Technical Specifications:** This cable features a 9/125 singlemode fiber core with G.657.A1 glass fiber composition, delivering exceptional performance characteristics. The insertion loss rating of ≤0.35dB (0.15dB typical) ensures minimal signal degradation over the 4-meter span, while the return loss specification of ≥20dB provides excellent impedance matching. Attenuation rates comply with rigorous standards: 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm. **Superior Design & Construction:** The cable features LC/UPC connectors on one end and ST/APC connectors on the other, providing versatile compatibility across diverse network architectures. The bright yellow OFNR (Optical Fiber Non-conductive Riser-Rated) jacket ensures compliance with fire safety codes while enabling quick visual identification in complex installation environments. At just 1.8mm outside diameter, this cable offers superior flexibility and ease of routing through cable trays and conduit. **Compliance & Reliability:** TAA compliance certifies this cable meets stringent government procurement standards. RoHS and ELV directive compliance ensures environmental responsibility. Manufacturing to ANSI/TIA/EIA-455-171-A-2001 standards guarantees consistent quality and performance. The straight-through polarity configuration simplifies installation and reduces configuration errors. **Application Versatility:** Ideal for data centers, telecommunications networks, campus networks, and fiber backbone installations where reliable simplex signal transmission is critical. The 4-meter length provides optimal reach for equipment-to-equipment connections without excessive cable runs. **Custom Solutions Available:** While this 4m configuration covers standard applications, custom lengths are available to meet specific installation requirements. Ships from strategically located US facilities (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99. **Warranty & Support:** Backed by a 90-day limited warranty, ensuring peace of mind in mission-critical network deployments.