What is the Sandstone GLC-LH-SM-ST?
The Sandstone GLC-LH-SM-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 1G SFP, 1000BASE-LX, 1310 nm, 10km SMF LC, NO DDM, C-Temp, *Supports up to 20km". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.