Keep high-speed uplinks simple when the fiber run extends beyond short-reach optics. Cisco SFP-10/25G-LR-S-RF is a refurbished SFP28 LR transceiver designed for 10/25 GbE links over single-mode fiber, with LC duplex connectivity and reach up to 10 km. That combination makes it a strong fit for aggregation layers, campus backbones, and data center interconnects where you want to preserve port density while extending distance. The SFP28 form factor supports modern switch platforms that need flexible 10 GbE and 25 GbE optics in the same operational model, reducing the need to stock multiple transceiver families. Because this is a refurbished unit, it can be a practical option for teams balancing performance requirements with budget discipline. It is especially useful when you need Cisco-compatible long-reach optics for standardized deployments, lab refreshes, or expansion projects that still demand enterprise-grade link behavior over single-mode fiber.