400G QSFP-DD DR4 to 4 x 100G QSFP28 DR1: An Easy Upgrade to a 400G Network
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.
What are 100G QSFP28 single lambda optical transceivers?
100G single lambda transceivers use only one lane that operate at speed of 100G to transport data with PAM4