Re: Learned Something New About Ethernet Today

Lawrence D'Oliveiro <ldo@nz.invalid> wrote:

Today I discovered that there are Ethernet interfaces that are not
backward-compatible with older, slower speeds. Specifically, anything
using the Intel X722 controller chip can do 1-gigabit and 10-gigabit, but
not 100 megabits or 10 megabits per second. Connect it to a 10/100 switch
port and ... silence.

A quick search suggests that controller is targeted at servers.
Does it connect to any physical ports with connectors that are
used for 10/100 Ethernet? I'd expect them only to be used with
the higher speed Ethernet connectors used on servers, which I
don't know of being used for 10/100 interfaces. Such servers
might use a different controller chipset for any RJ45 Ethernet
sockets.

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