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