The AddOn Mellanox Compatible TAA Compliant MC2210511-ER4 is a high-performance 40-Gigabit QSFP+ transceiver engineered for long-haul data center and metropolitan area networking applications. This advanced module delivers 40 Gbps throughput over single-mode fiber for distances up to 40 kilometers (approximately 25 miles), utilizing four CWDM optical lanes across the 1270nm to 1330nm wavelength range. The ER4 designation indicates Extended Reach capability, employing integrated multiplexing and demultiplexing technology to combine four 10G channels onto a standard fiber pair. Featuring a duplex LC connector configuration and Digital Optical Monitoring support, this transceiver provides comprehensive real-time diagnostics for optimal network performance. As a TAA Compliant module manufactured in the USA or UK, it meets stringent legal requirements for U.S. Federal Government, military, and GSA-schedule procurement. Ideal for enterprise data centers, telecommunications networks, and service provider infrastructures requiring extended-reach 40 Gigabit Ethernet connectivity over single-mode fiber infrastructure.