What is the Sandstone QSFP-100G-LR1-BXU-20KST?
The Sandstone QSFP-100G-LR1-BXU-20KST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 100G QSFP28, 100GBASE-LR1 BXU, TX1290/RX1310 nm, 20km SMF LC, DDM, E-Temp, RED Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.