What is the Juniper Networks QDD-400G-DR4?
The Juniper Networks QDD-400G-DR4 is a QSFP optical transceiver module, listed by the manufacturer as "QSFP-DD, 400GBASE-DR4 and 4X100GBASE-DR, SMF 500 meters, Standard Temperature (0 through 70 DEGREE C), MPO-12 connector". It is part of Circular Telecom's surplus and refurbished telecom/IT equipment inventory.
