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TP-Link Gigabit Single-Mode WDM Bi-Directional SFP Module
TP-Link Gigabit Single-Mode WDM Bi-Directional SFP Module (TL-SM321B-2) and TL-SM321A-2 is designed to work in a pair to create an on-site gigabit fiber communication up to 2km (2,000 meters). With one single-mode fiber, the pair of modules can create a full-duplex gigabit path between your switches, storage devices, and server.
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