What is the Sandstone QSFP-100G-LR4-OTU4-A-ST?
The Sandstone QSFP-100G-LR4-OTU4-A-ST is a QSFP optical transceiver module, listed by the manufacturer as "Arista Compatible Multi-Rate QSFP28, 100GBASE-LR4/OTU4, 1310 nm, 10km SMF LC, DDM, C-Temp, BLUE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.