The JBX01211 is a premium 40GBASE-LM4 QSFP+ optical transceiver designed for high-speed network deployments requiring reliable multimode fiber connectivity. This advanced module provides 40 gigabit-per-second data transmission capabilities over extended distances up to 150 meters, making it ideal for connecting network equipment across large data centers, enterprise campuses, and telecommunications facilities. **Key Technical Specifications:** The transceiver features a compact QSFP+ form factor with duplex LC/UPC connectors optimized for multimode fiber (OM4/OM3) installations. Its singlemode 9/125 fiber core configuration and metal enclosure with integrated laser transmitter ensure superior signal integrity and minimal signal degradation. The module operates reliably across temperatures from 0 to 70°C (32 to 158°F), accommodating diverse environmental conditions. **Compatibility & Standards:** Precisely engineered as an Arista QSFP-40G-UNIV compatible replacement, this transceiver integrates seamlessly into existing Arista network infrastructure without requiring driver updates or firmware modifications. It's fully qualified to IEEE 802.3ba and SFF-8436 standards, ensuring interoperability with certified network equipment. **Safety & Compliance:** Extensive safety certifications include Class 1 Laser designation, UL/FDA compliance (21CFR 1040.10), and TUV validation. The module meets RoHS (EU directive 2002/95/EC) and ELV requirements, making it suitable for environmentally conscious organizations. **Custom Programming Available:** For organizations requiring branded transceivers, custom brand programming services are available, enabling seamless integration with proprietary network management systems. **Warranty & Support:** Each module includes a 90-day limited warranty, providing confidence in your network investment. Free standard shipping on orders exceeding $99, with fulfillment from strategically located distribution centers in California and South Carolina. Whether expanding existing networks or deploying new infrastructure, the JBX01211 delivers enterprise-grade reliability and performance for demanding optical connectivity requirements.