What is the Sandstone QSFP-100G-LR4-S-I-ST?
The Sandstone QSFP-100G-LR4-S-I-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 100G QSFP28, 100BBASE-LR4/D,1310 nm, 10km SMF LC, DDM, I-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.