What is the Sandstone XCVR-Q40V31?
The Sandstone XCVR-Q40V31 is a QSFP optical transceiver module, listed by the manufacturer as "Ciena Compatible 100G QSFP28, 100GBASE-ER4-LITE, 1310 nm, 40km SMF LC, DDM, I-Temp, Single Rate Version w/FEC". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.