The JBX42534 ST/APC to ST/APC Duplex Singlemode Fiber Patch Cable is a comprehensive networking solution engineered for demanding telecommunications and data center environments. This 65-meter cable features industry-standard ST/APC connectors on both ends, supporting duplex (two-fiber) configurations that maximize bandwidth efficiency in high-speed network deployments. **Technical Excellence** Built with G.657.A1 glass fiber and a 9/125 singlemode core, this cable meets stringent performance standards for long-distance, high-bandwidth applications. The attenuation specifications (0.25 dB/km @ 1310 nm or 0.35 dB/km @ 1550 nm) ensure minimal signal loss over extended runs. Tested to ANSI/TIA/EIA-455-171-A-2001 standards, the cable delivers consistent insertion loss of ≤0.35dB (typical 0.15dB) and return loss ≥20dB, critical for maintaining signal quality in sensitive network infrastructure. **Robust Construction** The yellow OFNR (Optical Fiber Non-conductive Riser) jacket provides fire-resistant protection suitable for in-building backbone and riser applications. The compact 1.8mm outside diameter facilitates flexible installation in cable trays, conduit systems, and space-constrained environments without compromising durability or signal integrity. **Compliance & Reliability** TAA compliant and RoHS/ELV certified, this patch cable meets government procurement requirements and environmental standards. The Type A to B crossover polarity configuration supports the most common duplex patch cord applications, ensuring seamless integration with existing network infrastructure. Backed by a 90-day limited warranty and available in custom lengths, this cable accommodates specific installation requirements. **Applications** Ideal for telecommunications facilities, data centers, campus networks, and enterprise backbone infrastructure where reliable, long-distance fiber connectivity is essential. The 65-meter length reduces splicing requirements while maintaining optimal signal quality. **Free Shipping** Orders exceeding $99 qualify for free standard shipping from multiple distribution centers (Danville CA, Fort Worth TX, or Beaufort SC), ensuring rapid delivery to your location.