What is the Sandstone 407-BBZX-ST?
The Sandstone 407-BBZX-ST is a QSFP optical transceiver module, listed by the manufacturer as "DELL Compatible 100G QSFP28, 100GBASE-ER4-LITE, 1310 nm, 30km SMF LC, DDM, C-Temp, RED Latch, Single Rate Version w/FEC 2". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.