What is the Sandstone QFP100-L4D-0ELS-10K?
The Sandstone QFP100-L4D-0ELS-10K is a QSFP optical transceiver module, listed by the manufacturer as "MSA Compatible 100G QSFP28, 100GBASE-LR4/D, 1310 nm, 10km SMF LC, DDM, C-Temp, BLUE Latch, Single Rate Version/DFB TOSA". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.