What is the Sandstone 280-0016-ST?
The Sandstone 280-0016-ST is a XFP optical transceiver module, listed by the manufacturer as "Cyan Compatible 10G XFP, 10GBASE-ZR, OC192-LR2, STM64-L64.2, 1550 nm, 80km SMF LC, DDM, E-Tem". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.