The JBX88212 is a premium 55-meter ST/ST duplex singlemode fiber patch cable engineered for demanding telecommunications and data center environments. This cable features a robust 9/125 micron core specifically optimized for singlemode transmission, delivering superior signal quality and minimal signal degradation over extended distances. **Key Performance Features:** This fiber patch cable demonstrates exceptional optical performance with insertion loss of ≤0.35dB at tested wavelengths (typical 0.15dB) and return loss exceeding 20dB. The cable supports both 1310nm and 1550nm wavelengths with attenuation rates of 0.25 dB/km and 0.35 dB/km respectively, meeting industry standards for long-haul telecommunications applications. **Construction & Compliance:** The cable utilizes G.657.A1 grade glass fiber with a compact 1.8mm outside diameter, making it ideal for high-density installations. The yellow riser-rated (OFNR) jacket ensures compliance with building codes and fire safety requirements. TAA compliance makes this cable suitable for government and regulated installations. All manufacturing meets RoHS and EU directive 2002/95/EC standards. **ST/UPC Connectors:** Equipped with ST/UPC connectors in duplex configuration with Type A to B crossover polarity—the standard choice for most duplex patch cord applications. The UPC polish provides superior optical performance and reduced back-reflection. **Applications:** Perfect for data centers, network closets, telecommunications facilities, campus networks, and any installation requiring reliable singlemode fiber connectivity. The 55-meter length accommodates longer building runs and inter-building connections. **Shipping & Support:** Eligible for free standard shipping on orders over $99. Backed by a 90-day limited warranty and available in custom lengths to meet specific installation requirements. Ships from multiple US locations for faster delivery.