What is the Sandstone GLC-BX20-D-I-ST?
The Sandstone GLC-BX20-D-I-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 1G SFP, 1000BASE-BX-D, TX1550/RX1310 nm, 20km SMF LC, DDM, I-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.