Great keyboard definitely worth the price
Best controller in this price range
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View details on manufacturer's website
TL-SM321B
1000Base-BX WDM Bi-Directional SFP Module
Designed for on-site gigabit fiber communication
Up to 2 km transmission distance with 9/125 μm SMF (Single-Mode Fiber)
Bidirectional WDM communication on a single fiber
Compatible with Small Form Pluggable Multi-Source Agreement (SFP-MSA)
Supports Digital Diagnostic Monitoring (DDM)
Hot-swappable module design
Work with TL-SM321A-2 as a pair