What is the Sandstone GLC-ZX-SMD?
The Sandstone GLC-ZX-SMD is a SFP optical transceiver module, listed by the manufacturer as "Cisco ASR Compatible 1G SFP, 1000BASE-EZX, 1550 nm, 120km SMF LC, DDM, E-Temp, GREEN Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.