The JBX01356 100GBASE-4WDM-20 QSFP28 transceiver module represents a cutting-edge solution for organizations seeking to upgrade their network infrastructure to 100 Gigabit Ethernet speeds. Engineered to meet IEEE 802.3bm and QSFP28 MSA specifications, this optical transceiver delivers exceptional performance and reliability for mission-critical applications. **Technical Excellence:** This transceiver utilizes advanced 4-wavelength WDM (wavelength division multiplexing) technology to transmit 100 Gbps of data over a single strand of 9/125 single-mode fiber. The 20-kilometer reach makes it an excellent choice for metropolitan area networks (MANs), campus interconnects, and data center connectivity where moderate distances require high-capacity links without excessive latency. **Connectivity & Compatibility:** Designed with duplex LC/UPC connectors, the JBX01356 integrates seamlessly into existing fiber infrastructure. It is fully compatible with Extreme Networks equipment, specifically replacing the OEM part number 100G-4WDM-QSFP20KM, making it an ideal upgrade or replacement option for organizations already invested in Extreme Networks switching platforms. **Robust Design & Certification:** The module features a durable metal case housing a laser transmitter, engineered to withstand demanding data center and enterprise environments. Operating across a wide temperature range of 0-70°C (32-158°F), it maintains consistent performance in diverse deployment scenarios. The transceiver holds multiple safety certifications including Class 1 Laser compliance, TUV, UL/FDA, and 21CFR 1040.10 approval, ensuring adherence to the highest international safety standards. **Environmental Compliance:** Fully RoHS and ELV compliant per EU directive 2002/95/EC, this transceiver meets strict environmental protection regulations. The responsible manufacturing and materials selection make it suitable for organizations with sustainability initiatives and corporate environmental commitments. **Deployment Flexibility:** Custom brand programming is available for organizations requiring OEM-specific configurations. Free standard shipping on orders over $99 and a 90-day limited warranty provide additional value and peace of mind. Ships from convenient U.S. locations (Danville, CA or Beaufort, SC). **Applications:** Ideal for data center interconnects, carrier-grade networks, enterprise campus backbone links, and service provider metro networks requiring 100G connectivity over distances up to 20 kilometers. Whether upgrading existing infrastructure or building new high-capacity networks, the JBX01356 delivers the performance, reliability, and compatibility needed for modern optical networking.