The JBX01199 40GBASE-ER4 QSFP+ transceiver represents a professional-grade optical interconnect solution designed for organizations requiring high-capacity, long-distance network connectivity. This module is engineered to exceed IEEE 802.3ba standards while maintaining complete compatibility with Arista networking equipment. Key Technical Features: This transceiver operates at 40GB data rates across singlemode fiber, supporting transmission distances up to 40km—ideal for connecting geographically dispersed data centers or campus networks. The 9/125 singlemode fiber specification ensures signal integrity over extended ranges while minimizing attenuation and dispersion. Duplex LC/UPC connectors provide industry-standard, easy-to-deploy fiber connectivity with low insertion loss. Design & Durability: Constructed with a robust metal case housing precision laser transmitter components, this module delivers reliability in demanding enterprise environments. The compact 5x4x2-inch form factor fits seamlessly into existing QSFP+ infrastructure without requiring additional modifications or adapters. Compliance & Safety: Fully RoHS/ELV compliant and certified to EU directive 2002/95/EC, this transceiver meets stringent environmental and safety standards. Class 1 Laser certification, TUV, UL/FDA approval, and 21CFR 1040.10 compliance ensure safe operation in regulated environments. Arista Compatibility: Direct QSFP-40G-ER4 compatibility eliminates integration challenges, allowing seamless deployment in existing Arista-based network architectures. Custom brand programming options enable OEM integration for volume deployments. Operational Performance: With operating temperature range of 0-70°C (32-158°F), this module maintains consistent performance across diverse climate conditions. The 90-day limited warranty provides peace of mind for critical infrastructure investments. Applications: Ideal for metropolitan area networks (MANs), data center interconnection (DCI), campus network upgrades, and service provider long-haul deployments requiring 40GB connectivity without the expense of higher-speed modules.