What is the Sandstone QSFP-100G-SR4-S-ST?
The Sandstone QSFP-100G-SR4-S-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 100G QSFP28, 100GBASE-SR4, 850 nm, 100m MMF MPO, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.