What is the Sandstone GLC-ZX-SMD-ST?
The Sandstone GLC-ZX-SMD-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco compatible 1G SFP 1000BASE ZX, 1550nm 80km SMF LC, DDM E-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.