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HS-31DLC20D is a reliable, industrial-grade 1G/2.5G SFP module designed for long-distance single-mode links up to 20 km. It uses the widely supported 1310 nm wavelength and an LC connector for full-duplex operation, making it a perfect fit for backbone links, campus networks, industrial deployments, and I- SP infrastructure. This new model delivers all the essential features of our popular S-31DLC20D, but now with 2.5G support at the same affordable price. A straightforward upgrade path for customers who want additional bandwidth while preserving existing fiber installations. The module includes built-in digital diagnostics (DDM) for monitoring optical power, voltage, temperature, laser bias current, and other key parameters. These functions help detect abnormal activity or when customizable operating limits are exceeded. Monitoring makes it easier to plan ahead, make informed decisions, and schedule upgrades or maintenance based on real performance data.