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QSFP-40G-ER4 40gb/s ER4 40KM 1310nm LC Fiber Optical Transceiver sfp Module 40g qsfp Guaranteed manufacturer 40g/100g qsfp 10km/80km/20km fiber optic transceiver QSFP-40G-ER4 40G QSFP+ ER4 40km 1310nm ...