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Continue to Chathttps://www.longlinestore.com/h3c-sfp-ge-sx-mm850-a-compatible-1000base-sx-sfp-850nm-550m-dom-duplex-lc-mmf-transceiver-module - H3C SFP-GE-SX-MM850-A Compatible 1000BASE-SX SFP 850nm 550m DOM Duplex LC MMF Transceiver Module