TP-LINK ISM321B-20 1000BASE-BX WDM BI-DIRECTIONAL INDUSTRIAL SFP MODULE, ! MODEL : ISM321B 20 > WDM Bi Directional > 1x Gigabit LC Port > Single mode > Up to 20 km Distance > Support DDM > Industrial Operating Temperature Range: 40 85C > Hot Swappable Warranty policy 1. Goods sold are neither returnable not refundable. 2. Warranty void id seal is broken or tempered. 3. Burn and external damage does not cover manufacturing warranty. 4. Item damaged from power surge, short circuit, burnt, water spill, damages caused during
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