What is the Sandstone ZXS-QDL4ZZZZ-00-ST?
The Sandstone ZXS-QDL4ZZZZ-00-ST is a QSFP optical transceiver module, listed by the manufacturer as "Infinera Compatible Multi-Rate QSFP-DD, 400GBASE-LR4, 1310 nm, 10km SMF LC, DDM, C-Temp, BLUE Latch, With FEC". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.