The JBX01245 40GBASE-LR4L QSFP+ transceiver module represents cutting-edge optical networking technology designed for enterprise-level data center applications. This high-performance module delivers sustained 40 Gigabit Ethernet speeds over distances up to 2 kilometers utilizing singlemode fiber (9/125 core), making it ideal for campus networks, data center interconnects, and metropolitan area networks (MANs). Key Technical Specifications: The transceiver features a compact QSFP+ form factor with duplex LC/UPC fiber connectors, enabling seamless integration into modern network infrastructures. With a 9/125 singlemode fiber core, it supports long-distance transmission with minimal signal degradation. The module operates reliably across a wide temperature range (0°C to 70°C / 32°F to 158°F), ensuring performance consistency in various deployment scenarios. Compatibility and Integration: As a direct Arista QSFP-40G-LRL4 equivalent, this transceiver provides plug-and-play compatibility with existing Arista systems and other standards-compliant networking equipment. It replaces the original OEM part number while offering superior value and custom branding options. Compliance and Safety: The module adheres to rigorous international standards including IEEE 802.3ba and SFF-8436 specifications. It carries multiple safety certifications: Class 1 Laser rating, FDA compliance (21CFR 1040.10), TUV approval, and UL certification. RoHS and ELV directives (EU 2002/95/EC) compliance ensures environmental responsibility and regulatory adherence. Quality and Warranty: Manufactured using precision-engineered components with a metal case housing and integrated laser transmitter, the JBX01245 delivers durability and reliability. Every module includes a 90-day limited warranty, backed by responsive technical support. Free standard shipping applies to orders exceeding $99, with convenient fulfillment from multiple U.S. locations (Danville, CA and Beaufort, SC). Applications: Perfect for data center expansions, network upgrades, disaster recovery links, and high-speed campus interconnections. The module excels in environments requiring reliable 40GB connectivity without the expense of extended-range equipment when 2km coverage suffices. Custom brand programming is available for OEM and enterprise customers requiring white-label solutions.