Can OSFPs be plugged into a QSFP-DD port, or QSFP-DD’s plugged into an OSFP port?

 No. The OSFP and the QSFP-DD are two physically distinct form factors. For OSFP systems, OSFP optics and cables must be used, and for QSFP-DD systems, QSFP-DD optics and cables must be used.

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