MikroTik S-3553LC20D Pair of SFP modulesMikroTik SFP S-3553LC20DTwo (1.25G) module kit, 20Km, single mode. THe MikroTik S-35/53LC20D is a pair of SFP transceivers, the S-35LC20D is a 1.25G Single Mode optical SFP module with a LC connector, T1310nm/R1550nm, which works for connections up to 20km and supports DDM. The S-53LC20D is a 1.25G Single Mode optical SFP transceiver with an LC connector,T1550nm/R1310nm, which works for connections up to 20km and supports DDM.  Product specifications:DetailsProduct codeS-3553LC20DConnectorLC UPCData Rate1.25GDistance20KMFormatSFPModeSM