What is the Sandstone SFPGE-EX55-0ELS-40K?
The Sandstone SFPGE-EX55-0ELS-40K is a SFP optical transceiver module, listed by the manufacturer as "MSA Compatible 1G SFP, 1000BASE-EX55, 1550 nm, 40km SMF LC, NO DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.