What is the Sandstone GLC-FE-100FX-ST?
The Sandstone GLC-FE-100FX-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 100M SFP, 100BASE-FX, 1310 nm, 2km MMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.