Friday, September 11, 2020

Buying SFP28 Cables

I'm getting together some passive SFP28 cables for a 25Gbps project. This is all short run .5m or 1m, in the same rack. Switches are Dell and NICs are Mellanox ConnectX-5 and Intel XXV710. I've been chatting with a rep at FS.com about cables from them. He's telling me I'll need 'custom' cables with one end designated for Dell and the other for Mellanox/Intel etc. This doesn't make much sense to me. Can it be you'd need a diff cable for every NIC in the mix? The switch came with some Dell branded SFP28 cables, they work just fine with both NICs as well as some Broadcoms.

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I'm also going to connect a Fortinet switch to the Dell switch via SFP+ (10Gbps). Totally makes sense to me to have a custom cable for that.



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