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