What is the Sandstone 7SY-000-ST?
The Sandstone 7SY-000-ST is a SFP optical transceiver module, listed by the manufacturer as "Accedian Compatible 1G SFP, 1000BASE-BX-U, TX1310/RX1490 nm, 40km SMF LC, DDM, C-Temp, BLUE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.