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The QSFP28 100G-CWDM4-10km module is a highly integrated 4x28G transceiver focused on reach, bandwidth, density and cost for highport-count 100G systems, and client-side 100G interfaces. It is compliant with the 100G 4WDM-10 MSA, which is based on the CWDM4 MSA version 1.1, but alters some of the specifications to extend the link reach from 2 km to 10 km. It is interoperable with CWDM4 transceivers over a 2 km reach.