this post was submitted on 30 Sep 2023
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what the fuck does that mean (feddit.de)
submitted 2 years ago by nx2@feddit.de to c/memes@lemmy.ml
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[–] Mautobu@victoriagaming.ca 16 points 2 years ago (2 children)

This is the necessary cable. https://www.fs.com/de-en/products/30827.html

[–] nomecks@lemmy.world 7 points 2 years ago* (last edited 2 years ago) (1 children)

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.

[–] MxM111@kbin.social 2 points 2 years ago (1 children)

Does 40G QSFP transponder be able to even communicate with 10G SFP? Do they even have the same encoding? OOK? QPSK?

[–] admin@sh.itjust.works 3 points 2 years ago (1 children)

Yeah they would need a breakout cable. And there’s no way in hell they can have a link of 40G via SFP+ to a 10G appliance.

[–] tjhart85@kbin.social 5 points 2 years ago (1 children)

Agreed that they can't get a 40G link when attaching to a 10G device, but the 40G QSFP can be split into 4 10G SFP+ connections instead

[–] admin@sh.itjust.works 2 points 2 years ago

Also for whoever is curious, there’s 100G QSFP28 which has breakdown cables to 4x 25G SFP28, I’m not a networks guy but I think at that point it’s not Ethernet anymore but InfiniBand.