What is the Sandstone 280-0106-80K-ST?
The Sandstone 280-0106-80K-ST is a SFP optical transceiver module, listed by the manufacturer as "Cyan Compatible 1G SFP, 1000BASE-BX-U, TX1490/RX1550 nm, 80km SMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.