Juniper Networks SFP-1G-SX-C 40GBase-LR4 QSFP+ Module | SMF, Enterprise

Support demanding optical interconnects with a QSFP+ transceiver designed for 40GBase-LR4 deployments. This module delivers 40 Gigabit Ethernet performance over single-mode fiber with a maximum distance of 10 km, making it well suited to campus backbones, data center interconnects, and other links where reach cannot come at the expense of throughput. The LR4 architecture is built for efficient long-distance transport across optical fiber infrastructure. That matters when you are connecting switches, aggregation layers, or server-adjacent network segments that need predictable performance over extended runs. The QSFP+ form factor keeps the footprint compact while supporting the bandwidth required by modern network fabrics. For teams standardizing on Juniper-compatible optics, this transceiver offers a clear fit for high-value links that justify a more capable optical component. It is the kind of module you choose when the cost of a weak link is higher than the cost of doing it right the first time.