The JBX01242 is a premium 40GBASE-LR4 QSFP+ transceiver module engineered for next-generation data center and enterprise network deployments. This high-performance optical transceiver provides 40 gigabit per second (40GB) data rates with extended 10-kilometer transmission capabilities over single-mode fiber infrastructure. **Key Features & Specifications:** This transceiver utilizes industry-standard 9/125 micrometers single-mode fiber with duplex LC/UPC connectors, ensuring compatibility with existing network installations. The LR4 designation indicates long-reach capability, making it ideal for campus networks, metropolitan area networks (MAN), and data center interconnects. The module's compact QSFP+ form factor (5x4x2 dimensions) integrates seamlessly into switch line cards and network equipment. **Compatibility & Integration:** Directly replaces NVIDIA Mellanox MC2210511-LR4 modules, providing a cost-effective alternative without sacrificing reliability or performance. Full IEEE 802.3ba and SFF-8436 standard compliance ensures broad system compatibility and future-proof networking investments. **Safety & Compliance:** Manufactured with rigorous quality standards, this transceiver features a metal case with integrated laser transmitter technology. It holds Class 1 laser certification (LN #50 7/2001), TUV validation, UL/FDA approval (21CFR 1040.10), and full RoHS/ELV directive compliance. These certifications guarantee safe operation in corporate and regulated environments. **Performance & Reliability:** With stable operation across 0-70°C temperature ranges, this module performs consistently in challenging network environments. The 90-day limited warranty provides peace of mind, backed by professional technical support. Free standard shipping applies to qualifying orders over $99, with convenient fulfillment from multiple US distribution centers. **Applications:** Ideal for high-speed data center interconnects, storage area networks (SAN), and enterprise campus network backbones requiring reliable long-distance optical transmission. Whether upgrading legacy systems or building new infrastructure, this QSFP+ transceiver delivers proven performance for mission-critical networking demands.