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.

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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