What is the Sandstone 321-0434-ST?
The Sandstone 321-0434-ST is a SFP optical transceiver module, listed by the manufacturer as "NETSCOUT Compatible 1G SFP, 10/100/1000BASE-T, SGMII 84H, 100m COPPER RJ45, NO DDM, C-Temp, GOLD Latch, 84h, RXLOS=DIS, TXDIS=DIS". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.