What is the Sandstone 280-0010-00-ST?
The Sandstone 280-0010-00-ST is a SFP optical transceiver module, listed by the manufacturer as "2.5GBase OC-48/STM-16/2.5G SONET IR LC, 15 Km, 1310 nm SFP transceiver, 100% Cyan compatible.". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.