this post was submitted on 30 Sep 2023
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This is the necessary cable. https://www.fs.com/de-en/products/30827.html
You can just connect a normal fiber between a 10G SFP and a 40G QSFP and let the 40G end auto negotiate to 10G. Fanout cables are better for density though.
Does 40G QSFP transponder be able to even communicate with 10G SFP? Do they even have the same encoding? OOK? QPSK?