The JBX01204 40GBASE-ER4 QSFP+ Transceiver represents the ideal solution for enterprise networks requiring high-capacity, long-distance optical connectivity. Engineered to IEEE 802.3ba and SFF-8436 standards, this module delivers exceptional performance for mission-critical network deployments. **Extended Range Capabilities:** With 40km transmission distance over single-mode fiber, this transceiver eliminates the need for costly signal regeneration equipment in campus or metropolitan area networks. The ER4 variant optimizes for extended reach while maintaining full 40Gbps bandwidth, making it perfect for data center interconnects and carrier-grade applications. **Superior Connector Technology:** The duplex LC/UPC fiber connectors provide industry-standard low-loss connections with superior return loss characteristics. The UPC (Ultra Physical Contact) geometry ensures optimal signal integrity and reduces reflection-related signal degradation, critical for maintaining performance over long distances. **Extreme Networks Compatibility:** As a drop-in replacement for Extreme Networks 40G-QSFP-ER4-1 modules, this transceiver ensures plug-and-play installation without firmware updates or complex configuration. Supports OEM part numbers 40G-QSFP-ER4-1, AA1404003-E6, and 10335. **Safety & Compliance:** Class 1 laser certification combined with FDA 21CFR 1040.10 approval guarantees safe operation in professional environments. RoHS and ELV directive compliance ensures environmental responsibility. Comprehensive certifications from TUV and UL further validate reliability. **Optimal Operating Environment:** Designed for stable performance across 0°C to 70°C operating temperatures, accommodating both cooled data center environments and equipment room conditions. Metal case construction provides electromagnetic shielding and robust mechanical protection. **Value & Support:** Includes 90-day limited warranty with free standard shipping on qualified orders. Custom brand programming available for wholesale and OEM applications. Ships from strategic U.S. locations (California and South Carolina) for rapid deployment. **Application Scenarios:** Ideal for enterprise data centers, service provider networks, university campuses, financial institutions, and any organization requiring reliable 40Gbps connectivity beyond standard reach limitations. Particularly valuable in metropolitan area networks where fiber distance exceeds 10km but regeneration costs aren't justified. **Technical Specifications Summary:** Form Factor: QSFP+, Data Rate: 40Gbps, Distance: 40km, Fiber Type: Single-mode (9/125µm), Connectors: Duplex LC/UPC, Dimensions: 5.0" × 4.0" × 2.0", Materials: Metal case with laser transmitter, Standards: IEEE 802.3ba, SFF-8436