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HS-2733LC20D is a pair of reliable, industrial-grade 1G/2.5G SFP modules designed for single-mode links up to 20 km. By transmitting and receiving on different wavelengths over a single fiber strand, these modules help reduce fiber requirements while maintaining stable long-distance connectivity. This new pair delivers all the essential features of our popular S-3553LC20D modules, but now with 2.5G support at the same affordable price. A practical upgrade for single-fiber deployments that require more bandwidth without replacing existing infrastructure. 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.