What is the Sandstone SFP-DGD-SXTH-ST?
The Sandstone SFP-DGD-SXTH-ST is a SFP optical transceiver module, listed by the manufacturer as "TRANSCEIVER, PLUGGABLE SMALL FORM, SFP 1 GBPS SX, or 1000BASE-SX GIGE, MM, 850NM, 550M, WITH DIGITAL DIAGNOSTICS; TEMPERATURE HARDENED -40 TO +85C.". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.