The JBX01245 40GBASE-LR4L QSFP+ transceiver represents enterprise-grade optical connectivity for demanding network environments. Delivering 40 gigabits per second (40Gbps) data rates, this singlemode fiber module supports transmission distances up to 2 kilometers, making it ideal for campus networks, data center interconnects, and metropolitan area networks (MANs). **Key Technical Features:** This QSFP+ transceiver utilizes standard singlemode fiber (SMF) with 9/125 micrometer core specifications, ensuring compatibility with existing network infrastructure. The duplex LC/UPC connector design provides low insertion loss and superior optical performance. Operating across a wide temperature range of 0-70°C (32-158°F), the module maintains consistent performance in various deployment scenarios. Manufactured with precision-engineered metal housing and integrated laser transmitter technology, it delivers reliable signal transmission with minimal attenuation. **Compliance and Certification:** Fully qualified to IEEE 802.3ba and SFF-8436 standards, the JBX01245 meets rigorous telecommunications specifications. Class 1 laser safety certification, TUV, UL/FDA 21CFR 1040.10 compliance, and RoHS/ELV directive adherence ensure safe operation in regulated environments. This comprehensive certification portfolio makes it suitable for enterprise deployments with strict compliance requirements. **Arista Compatibility:** This module directly replaces the Arista QSFP-40G-LRL4 component, offering drop-in compatibility with existing Arista network equipment. Custom brand programming is available for OEM integration and white-label applications. **Value Proposition:** The JBX01245 delivers carrier-grade performance at competitive pricing, with free standard shipping on qualifying orders. The 90-day limited warranty provides peace of mind, while manufacturing from Vietnam and China ensures reliable supply chain management. **Applications:** Ideal for data center core networking, high-speed backbone interconnects, and campus network upgrades requiring 40G connectivity over moderate distances with singlemode fiber infrastructure.