What is the Sandstone QSFP-100G-BXU-20K-A-ST?
The Sandstone QSFP-100G-BXU-20K-A-ST is a QSFP optical transceiver module, listed by the manufacturer as "Arista Compatible 100G QSFP28, 100GBASE-4WDM-20 BX-U, TX1280/RX1300 nm, 20km SMF LC, DDM, C-Temp, RED Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.