What is the Sandstone GLC-T-I-ST?
The Sandstone GLC-T-I-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 1G SFP, 1000BASE-T, 100m COPPER RJ45, NO DDM, I-Temp, 88h, RXLOS=DIS, TXDIS=DIS". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.