What is the Sandstone QSFP-100G-BX80U-ST?
The Sandstone QSFP-100G-BX80U-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible Multi-Rate QSFP28, 100GBASE-BX-U, TX1280/RX1300 nm, 80km SMF LC, DDM, C-Temp, WHITE Latch, With FEC". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.