The JBX01420 100GBASE-ER4-Lite QSFP28 transceiver represents a cost-effective solution for organizations requiring high-speed, long-distance optical connectivity. This module is engineered to deliver 100GB/s data rates across single-mode fiber spans up to 40km, making it ideal for metropolitan area networks (MANs) and extended campus deployments. **Key Technical Features:** This transceiver utilizes a 9/125 single-mode fiber core with duplex LC/UPC connectors, providing the industry-standard interface for mission-critical applications. The ER4-Lite designation indicates extended range capability optimized for cost efficiency without compromising performance. With forward error correction (FEC) integrated, the module ensures data integrity even in challenging optical environments. **Compatibility & Integration:** Designed as a drop-in replacement for Cisco QSFP-100G-ER4L-S transceivers, this module integrates seamlessly into existing Cisco infrastructure without requiring firmware updates or reconfiguration. The QSFP28 form factor is industry-standard, fitting all compliant equipment. **Reliability & Certifications:** Manufactured to stringent quality standards with RoHS/ELV compliance, this transceiver carries comprehensive safety certifications including Class 1 Laser, TUV, UL, and FDA approval (21CFR 1040.10). The metal case provides excellent electromagnetic shielding and durability. Operating across 0-70°C, it performs reliably in diverse data center environments. **Warranty & Support:** Backed by a 90-day limited warranty, plus custom brand programming is available for OEM requirements. Free standard shipping on orders over $99, with fulfillment from strategic US locations (Danville, CA and Beaufort, SC). **Applications:** Ideal for campus interconnects, disaster recovery links, metropolitan networks, and high-performance data center architectures requiring extended reach at 100GB speeds.