The working principle of QSFP-DD is similar with 100G QSFP28 transceiver. The QSFP-DD MSA group will increase the lane to eight. There will be a row of contacts providing for an eight lane electrical interface in QSFP-DD. If modulated by NEZ, each lane of the fiber trunk cable can support data rate up to 25G, thus, it can support a total data rate of 200G. If modulated by PAM4, it can support data rate up to 400G with each lane supporting data rate of 50G. The MSA group also announced that the QSFP-DD can enable up to 14.4Tbps aggregate bandwidth in a single switch slot, which can definitely satisfy the increasing need for higher bandwidth.

 

Another great feature of QSFP-DD is that its system will be backwards compatible, allowing them to support existing QSFP modules and provide flexibility for end users and system designer. This means the data center could save a considerable sum of money in the future upgrading.

 

Future and Present

The appearance of fiber adapter panel has changed the regular development road map of Ethernet. The regular upgrade road is 10G to 40G and then 100G. While the QSFP28 transceiver has changed it from 25G directly to 100G. The road map of this QSFP-DD is also drawing our attention. It is predicted that it will become a useful family of modules for the industry with application at greater than 400G. Meanwhile, there is no efforts underway to define these new speeds but it is expected that QSFP-DD will have a roadmap that supports.

 

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