[gentoo-user] Re: Usb over Ethernet: The rise and fall of one usb0 ;)

[Grant Edwards]

On 2014-11-19, meino.cramer@×××.de <meino.cramer@×××.de> wrote:

> the little Linux board Arietta G25 has a ethernet over usb feature --
> no real PHY, no RJ45 plug/jack.

I don't understand.

Regardless of the bus between the CPU and the Ethernet controller
(USB, PCI, ISA, PCI-express), and regardless of the connector between
the Ethernet PHY and the cable (RJ45, M12, etc.) you have to have a
PHY, or it's not Ethernet.

[There is one exception to this: the old 15-pin D-sub AUI connector
could be use to directly interconnect to Ethernet controllers via an
AUI hub without using any PHYs.  But, I haven't seen anything with an
AUI interface on it for 20 years.]

Or are you talking about some _other_ protocol that's being run over
USB that presents to the Linux network layer the same API as that
implemented by Ethernet drivers?

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