What is the Sandstone UF-SM-10G-ER-ST?
The Sandstone UF-SM-10G-ER-ST is a SFP+ optical transceiver, listed by the manufacturer as "Ubiquiti Networks Compatible 10G SFP+, 10GBASE-LR, 1550 nm, 40km SMF LC, DDM, I-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.