What is the Sandstone 280-0240-ST?
The Sandstone 280-0240-ST is a SFP+ optical transceiver, listed by the manufacturer as "Cyan Compatible 10G DWDM SFP+, 10GBASE-ZR, 1551.72 nm, CH32, 80km SMF LC, DDM, E-Temp, GREEN Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.