What is the Sandstone SFP-10G-ER-S-ST?
The Sandstone SFP-10G-ER-S-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, *Ethernet Only S-Class Part". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.