Comment by Neywiny

Slight caveat that a lot of Ethernet PHYs > 1G don't go down to 10 Mb, my some don't go to 100 Mb, and some are only the speed they want to be (though luckily that's not very common). There exist 6-speed PHYs (10,100,1000,2500,5000,10000) but that doesn't mean everything will happily talk