What is the Sandstone 100-01669-ST?
The Sandstone 100-01669-ST is a SFP optical transceiver module, listed by the manufacturer as "Calix Compatible 1G SFP, 1000BASE-BX-D, TX1490/RX1310 nm, 20km SMF LC, DDM, I-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.