> SFP transceivers are just that- transceivers, they will spit out what you put in
This is only valid for ≤10Gbaud SFP(+) transceivers. SFP28 have CDR chips in them that will balk at doing anything other than supported rates, e.g. {25.78125, 26.5625, 27.952…} Gbd. Even supporting 10.3125Gbd is not a given.
(You can put other things on them, but you need to match a supported rate.)
This is only valid for ≤10Gbaud SFP(+) transceivers. SFP28 have CDR chips in them that will balk at doing anything other than supported rates, e.g. {25.78125, 26.5625, 27.952…} Gbd. Even supporting 10.3125Gbd is not a given.
(You can put other things on them, but you need to match a supported rate.)