MikroTik Pair of 1G SFP WDM BiDI (LC,SM)-20km fiber modules

MikroTik S-3553LC20D, 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 transeiver with an LC connector,T1550nm R1310nm, which works for connections up to 20km and supports DDM.