The JBX02409 25GBASE-ER SFP28 transceiver represents a premium solution for organizations requiring high-speed, long-distance optical network connectivity. This advanced module combines proven 25 Gigabit Ethernet technology with extended-reach capability, making it ideal for metropolitan area networks (MANs), data center interconnects, and telecommunications applications. **Key Technical Features:** Operating at 1310nm wavelength, the transceiver achieves 40-kilometer transmission distances over standard single-mode fiber (SMF) with 9/125 micron core specifications. The duplex LC/UPC connector provides superior optical performance with minimal insertion loss and excellent return loss characteristics. With 25Gbps data rate capability, it fully complies with IEEE 802.3by and SFF standards (SFF-8402, SFF-8472). **Performance & Reliability:** The integrated metal case with precision laser transmitter maintains consistent performance across demanding operating temperatures (0-70°C / 32-158°F). Class 1 Laser certification ensures safe operation in production environments, while comprehensive safety certifications (TUV, UL, FDA 21CFR 1040.10) validate deployment reliability. **Compliance & Sustainability:** RoHS/ELV compliant design eliminates hazardous substances, supporting corporate sustainability initiatives and regulatory compliance across global markets. The 90-day limited warranty provides confidence in product reliability. **Application Scenarios:** Ideal for upgrading legacy 10GbE infrastructure, establishing redundant network links, and supporting bandwidth-intensive applications including cloud computing, video streaming, and data analytics. The Cisco SFP-25G-ER-S compatibility ensures seamless integration into existing Nexus and ASR platforms. **Custom Solutions Available:** Custom brand programming accommodates OEM requirements and enterprise deployments. Orders over $99 qualify for free standard shipping from multiple U.S. locations (Danville, CA and Beaufort, SC).