The 100G QSFP28 ER1 CWDM is designed for 30km optical communication applications. It is intended for the service with single mode fiber in 100Gb/s high speed data communications.
The 100G QSFP28 LR1 DWDM is designed for 20km optical communication applications. It is intended for the service with single mode fiber in 100Gb/s high speed data communications.