The JBX01419 100GBASE-ER4-Lite QSFP28 Transceiver represents enterprise-grade optical connectivity designed for demanding network infrastructure requirements. This extended-range transceiver module delivers 100 gigabits per second of data transmission capability over single-mode fiber distances up to 40 kilometers, making it an ideal solution for data center interconnects, metropolitan area networks (MANs), and campus-wide deployments. **Technical Specifications & Performance:** This QSFP28 module operates at 100GBASE-ER4-Lite speeds with full compliance to IEEE 802.3bm and QSFP28 MSA standards. The transceiver utilizes a 9/125 micrometers single-mode fiber core for optimal signal transmission over extended distances. Its duplex LC/UPC connectors ensure secure, low-loss fiber connections critical for high-speed data transmission. The metal case construction with integrated laser transmitter provides durability and thermal management for continuous operation in demanding environments. **Compatibility & Integration:** This module is engineered as a drop-in replacement for the Arista QSFP-100G-ERL4 transceiver, ensuring seamless integration with existing Arista-based networking equipment. The QSFP28 form factor accommodates standard 100GB network switch ports without requiring additional adapters or modifications. **Safety & Compliance:** Manufactured to the highest standards, this transceiver features Class 1 Laser certification, UL/FDA compliance (21CFR 1040.10), and TUV certification. It meets EU Directive 2002/95/EC (RoHS) and ELV requirements, ensuring environmental responsibility and workplace safety. The commodity classification (8544.70.0000) reflects its status as professional optical networking equipment. **Operational Environment:** Designed for reliability in diverse conditions, the transceiver operates effectively across temperatures from 0°C to 70°C (32°F to 158°F). Precision laser optics deliver consistent performance regardless of environmental fluctuations, making this module suitable for both climate-controlled data centers and outdoor cabinet deployments. **Logistics & Support:** Shipping is available from distribution centers in Danville, CA and Beaufort, SC, with free standard shipping on orders exceeding $99. Custom brand programming is available for integration with specific network management systems. Each unit includes a comprehensive 90-day limited warranty covering manufacturing defects and operational failures. **Ideal Applications:** This transceiver excels in enterprise data center environments, service provider networks, financial trading floors, research institutions, and any infrastructure requiring high-speed, long-distance optical connectivity. The 40km reach eliminates the need for expensive optical amplification while delivering carrier-class reliability.