The JBX01964 represents a premium solution for network engineers and IT professionals seeking reliable, cost-effective optical transceiver technology. This 100BASE-BX20-D SFP module combines advanced engineering with proven compatibility, delivering exceptional performance for extended-distance fiber optic networks. **Key Features & Specifications:** This transceiver operates at 100MB data rates with extended-reach capability up to 20 kilometers over single-mode fiber (9/125 core size). The simplex LC/UPC fiber connector configuration provides secure, low-loss connections suitable for both new installations and retrofit applications. As a direct replacement for Cisco GLC-FE-100BX-D, it integrates seamlessly into existing Cisco infrastructure without requiring network redesign. **Technical Excellence:** Qualified to industry-standard SFF-8472 specifications, the module incorporates bidirectional (BiDi) transmission technology that extends beyond traditional IEEE 802.3ah standards. The metal case construction with integrated laser transmitter ensures durability and optimal thermal management, while the compact 5x4x2 millimeter form factor maintains compatibility with standard SFP slots. **Compliance & Safety:** Comprehensive safety certifications include Class 1 Laser classification (LN #50 7/2001), UL and FDA compliance (21CFR 1040.10), and TUV certification. Full RoHS and ELV directive compliance ensures environmentally responsible manufacturing and end-of-life management. **Reliability & Support:** Operating across 0-70°C ambient temperatures with 90-day limited warranty, this module supports mission-critical applications. Custom brand programming is available for enterprise deployments. Ships with free standard shipping on orders over $99 from convenient U.S. locations (Danville, CA and Beaufort, SC). **Applications:** Ideal for campus interconnects, metropolitan networks, disaster recovery links, and carrier backhaul applications requiring extended transmission distances over single-mode fiber infrastructure.