The key advantage of connecting a #400G QSFP-DD DR4 to 4 x #100G QSFP28 DR1 is that you can continue to use existing 100G QSFP28 hardware while upgrading to a 400G network. Compatible with #Cisco and #Nvidia ! sintrontech.com/400g-qsfp-dd-d… #Datacenter #Optics #Transceiver #Fiber