25G SFP28 capable of rate-adaption down to 1G?

Randy Carpenter rcarpen at network1.net
Mon Jan 31 19:02:53 UTC 2022

Are you talking about an SFP28 module that can link at 25Gb, but also 1Gb?

We just put 1Gb SFPs in the SFP28 ports and they work fine. I have not seen a single module that does both, but admittedly, I have not looked too hard, as the 1Gb modules are so cheap.

Or, are you talking about a module that presents as 25Gb to the switch, but 1Gb to the client device?


----- On Jan 31, 2022, at 1:05 PM, Bill Woodcock woody at pch.net wrote:

> Hey, does anyone know of an SFP28 capable of rate-adapting down from 25G on the
> cage side down to 1G on the line side?  Can be copper or fiber on the line
> side, I don’t care, my interest is in the chip inside.
> Thanks,
>                                 -Bill

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