What is the Sandstone 100-02611-120K-ST?
The Sandstone 100-02611-120K-ST is a SFP optical transceiver module, listed by the manufacturer as "Calix Compatible 1G SFP, 1000BASE-BX-U, TX1490/RX1550 nm, 120km SMF LC, DDM, I-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.