Cisco QDD-2X100G-CWDM4-S Compatible 200G QSFP-DD CWDM4 2km Dual CS SMF Optical Transceiver Module This 200G QSFP-DD CWDM4 is designed to reach 2 km over OS2 single mode optical fiber. The 200G CWDM4 has a QSFP28-DD (Quad Small Form-Factor Pluggable Double...