What is the Sandstone E100GQSFPESR-ST?
The Sandstone E100GQSFPESR-ST is a QSFP optical transceiver module, listed by the manufacturer as "Intel Compatible 100G QSFP28, 100GBASE-eSR4, 850 nm, 300m MMF MPO12, DDM, CTemp, BEIGE Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.