What is the Sandstone CWDM-SFP-1350-40K-ST?
The Sandstone CWDM-SFP-1350-40K-ST is a SFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 1.25G CWDM SFP, 1000BASE-EX, 1350 nm, 40km SMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.