Re: [PATCH net-next v3 1/7] net: ethtool: pse-pd: Expand C33 PSE status with class, power and extended state
From: Kory Maincent
Date: Tue Jun 25 2024 - 07:59:40 EST
On Tue, 25 Jun 2024 12:33:50 +0200
Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> wrote:
> Hi Köry,
>
> On Tue, Jun 25, 2024 at 11:18:35AM +0200, Kory Maincent wrote:
> [...]
> [...]
> [...]
> [...]
> [...]
> >
> > In fact I can't test it, I have a splitter and an adjustable load, not a
> > splitter that can adjust it's own load. So I can't decrease the load of the
> > splitter itself and reach this error condition.
>
> Hm.. how about this setup:
> ------>>-----x--------->>----
> PSE |-load splitter
> ------>>-----x--------->>----
>
> Attach the load directly to the ethernet line after PSE did
> classification with splitter. Then remove splitter. As long as load is
> high enough, PSE will not turn the port off. Then reduce load until it drops
> below the threshold.
That was a good idea but I can't managed do test it.
This is what I try:
/---ethernet cable---PD
PSE===passive splitter=+
\---barrel cable---load
The active PD is well powered with PoE negotiation but there is no voltage at
the barrel cable of the passive splitter so the load is useless. :/ Maybe
passive splitter works only with passive injector.
Regards,
--
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com