What is the Sandstone 280-0053-ST?
The Sandstone 280-0053-ST is a XFP optical transceiver module, listed by the manufacturer as "Cyan Compatible 10G DWDM XFP, 10GBASE-ZR, 1546.92 nm, CH38, 80km SMF LC, DDM, C-Temp, WHITE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.