What is the PRE-QSFP56DD-LR4-UNIV?
The PRE-QSFP56DD-LR4-UNIV is a QSFP optical transceiver module, listed by the manufacturer as "QSFP-DD, LR4, CWDM, 400G, 10KM, SMF/LC,". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.