What is the Sandstone QSFP-4X10G-LR-S-ST?
The Sandstone QSFP-4X10G-LR-S-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 40G QSFP+, 40GBASE-LR4, 1310 nm, 10km SMF MPO12, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.