What is the Sandstone 7ST-000?
The Sandstone 7ST-000 is a SFP optical transceiver module, listed by the manufacturer as "Accedian Compatible 1G SFP, 1000BASE-BX-U, TX1310/RX1490 nm, 10km SMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.