What is the Sandstone GLC-EX-SMD-ST?
The Sandstone GLC-EX-SMD-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco ASR Compatible 1G SFP, 1000BASE-EX, 1310 nm, 40km SMF LC, DDM, E-Temp, BLUE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.