What is the Sandstone 280-0069-ST?
The Sandstone 280-0069-ST is a SFP optical transceiver module, listed by the manufacturer as "CYAN Compatible 1G CWDM SFP, 1000BASE-ZX, 1510 nm, 80km SMF LC, DDM, C-Temp, BLUE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.