Extend high-speed Ethernet where short-reach optics fall short. The Extreme Networks 10405 100GB PSM4 QSFP28 MPO module is built for 100 GbE links over single-mode fiber up to 2 km, giving network teams a practical option for backbone, aggregation, and inter-rack connectivity across larger facilities. PSM4 architecture is well suited to environments that need high bandwidth without moving to more complex long-haul transport. With QSFP28 form factor and MPO connectivity, this module supports dense port deployments while keeping cabling straightforward for structured fiber runs. It is a strong choice when you need to preserve switch density, maintain link performance, and avoid the cost and complexity of overbuilt optics. For enterprise networks, the value is in reach and efficiency: enough distance for campus-scale or data center-scale fiber paths, with the throughput required for storage, virtualization, and core switching traffic. When the link matters, this module helps keep the fabric fast, clean, and ready for growth.