What is the Sandstone QSFP-100G-CU20M-ST?
The Sandstone QSFP-100G-CU20M-ST is a QSFP optical transceiver module, listed by the manufacturer as "Cisco Compatible 100G QSFP28, 100GBASE-DAC, 20m 28AWG QSFP28, NO DDM, C-Temp, BLACK Latch". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.