What is the Sandstone QSFP-100G-ER1-BXD-ST?
The Sandstone QSFP-100G-ER1-BXD-ST is a QSFP optical transceiver module, listed by the manufacturer as "CISCO Compatible 100G QSFP28, 100GBASE-ER1 BX-D, TX1309/RX1304 nm, 40km SMF LC, DDM, C-Temp, RED Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.