What is the Sandstone 160-9603-900-ST?
The Sandstone 160-9603-900-ST is a QSFP optical transceiver module, listed by the manufacturer as "Ciena Compatible 400G QSFP-DD, 400GBASE-LR4 4x100G, 1310 nm, 10km SMF MPO12, DDM, C-Temp, With FEC". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.