What is the Sandstone QSFP-100G-ZR4-S-100K-ST?
The Sandstone QSFP-100G-ZR4-S-100K-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 100G QSFP28, 100GBASE-ZR4+, 1310 nm, 100km SMF LC, DDM, C-Temp". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.