dwdm sfp28 transceiver sfp transceiver sfp+ transceiver cwdm sfp transceiver cdwm sfp transceiver dwdm sfp+ transceiver fiber patch cable 40km sfp transceiver 80km sfp transceiver bidi sfp transceiver sfp optical transceiver active optical cable attenuator optical variable qsfp28 transceiver qsfp transceiver lc-lc fiber patch cable optical transceiver qsfp+ optical transceiver qsfp+ lr4 transceiver fiber optics optical network transceiver modules fiber optic transceivers 100g transceivers qsfp28 100g sr4
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