VIAVI TestCenter: What is the difference between QSFP28, QSFP-DD, and QSFP56 transceivers?

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VIAVI TestCenter: What is the difference between QSFP28, QSFP-DD, and QSFP56 transceivers?
The following table concludes the main differences of QSFP28, QSFP-DD and QSFP56.    
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