What is the Sandstone SU68AD-ST?
The Sandstone SU68AD-ST is a SFP optical transceiver module, listed by the manufacturer as "Marconi Compatible Multi-Rate CWDM SFP, 1000BASE-ZX, OC48-LR2, 100M-2.7Gbps, 1550 nm, 80km SMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.