openwrt ONE: not getting enough PoE power

[Michael Richardson]

Denver Gingerich <denver at ossguy.com> wrote:
    >> It turns out that the switch in question is a process by which it
    >> turns itself off momentarily to change to the correct vlan.  This is a
    >> local, IETF hackthon setting.  This cuts the PoE power, and so a cycle
    >> ensues when depending upon PoE only.
    >>
    >> There is still a bug though, because the loss of PoE power seems to
    >> reset the One even though there is USB power present.

    > To be clear, would you want it to always use whichever power source was
    > plugged in first?

That would an option, but I think it would be surprising to many people.
By "plugged in", you would really mean which source provides power first.
(My USB was plugged in. But I had turned the switch on the power bar off,
because I wanted my serial console ready.  I didn't expect PoE to be available)

    > Or are you hoping for some kind of UPS-style
    > automatic switch-over when both are connected and one power source
    > disappears?

I think this probably makes more sense for most people and would match
people's expectations better.   However, I recognize that PoE requires some
time (maybe a few dozen ms) to activate, so switching from USB to PoE
probably would not work.

So I'd conclude: if there is USB power, it should be used, and PoE should NOT
be negotiated.  That wouldn't have helped me, since I had USB turned off, and
the PoE was unexpected, but at least, when I disconnected the PoE, it would
have stuck to the USB.

I think that when the PoE got negotiated, it used that, even though USB was
also present, and when the PoE bounced, the router bounced.

    > I'm not sure how complicated the latter would be, but it's helpful to
    > know the expected use case so we can investigate the hardware options
    > accordingly (for the One, Two, or otherwise).

Whatever decision: I guess just document it :-)


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