The JBX01210 40GBASE-ER4 QSFP+ Transceiver is a premium-grade optical module engineered for enterprise-class networking applications requiring high-speed, long-distance data transmission. This extended-range transceiver provides 40GB per second throughput over singlemode fiber cables at distances up to 40 kilometers, making it ideal for campus interconnects, data center backbones, and metropolitan area networks. **Key Technical Specifications:** This transceiver utilizes 9/125µm singlemode fiber with Duplex LC/UPC connectors, ensuring compatibility with standard enterprise network infrastructure. The ER4 model incorporates forward error correction (FEC) technology to maintain signal integrity over extended distances, reducing data loss and improving overall network reliability. Operating across a wide temperature range of 0-70°C (32-158°F), the module adapts to various installation environments without performance degradation. **Design and Construction:** The JBX01210 features a rugged metal case housing a precision laser transmitter system, providing exceptional durability and heat dissipation. The compact QSFP+ form factor (5.0" L x 4.0" W x 2.0" H) integrates seamlessly into existing network infrastructure while maintaining minimal footprint requirements. All components meet stringent RoHS and ELV directives, reflecting commitment to environmental compliance. **Compliance and Certifications:** Fully qualified to IEEE 802.3ba specifications and SFF-8436 standards, this transceiver delivers predictable performance across certified network equipment. Multiple safety certifications including Class 1 Laser designation, TUV, UL, and FDA 21CFR 1040.10 compliance ensure safe operation in professional environments. The comprehensive certification profile makes it suitable for regulated industries and mission-critical deployments. **Compatibility and Integration:** Designed as a direct replacement for Ruckus E40G-QSFP-ER4 (OEM part number E40G-QSFP-ER4), the JBX01210 ensures plug-and-play compatibility with existing Ruckus networking equipment. Custom brand programming options are available for organizations requiring private-label configurations. **Warranty and Support:** Includes 90-day limited warranty covering manufacturing defects. Manufactured in Vietnam and China with distribution from Danville, CA and Beaufort, SC locations. Qualifies for free standard shipping on orders exceeding $99, reducing procurement costs for bulk deployments. **Ideal Applications:** Perfect for data center interconnection, campus network expansion, metropolitan area networks, and high-speed backbone infrastructure requiring reliability and performance at extended distances.