PoE energy cutoff on boot

heya I just replaced my 12v 60W power supply with a PoE splitter to power a Topton N100 running VyOS bare metal 1.5-rolling-202401140026. The switch is an Aruba Instant On 1930 8-Port PoE.

Oddly, the machine starts up (so it has power), but crashes whilst loading VyOS, specifically at:

[ OK ] Finished systemd-journal-flush.service - Flush journal to Persistent Storage.
[ OK ] Starting systemd-sysctl.service - Apply kernel variables...

It seems to be related to some sudden power cutoff, because if I switch back to the socket power supplier, boots fine.

What could it be? How could I debug this?


Are you sure the POE supplier can provide enough power? That would be my first suspect.

oddly enough, I just tried with another PoE splitter which is basically the same specs but limited to 10/100 Mbps data speed and does work without any trouble…

This work:

PS5712AT-25 PoE Splitter
OUTPUT:12V/2A; IEEE802.3af/at
Data Speed:10/100Mbps;INPUT:DC44-57V
Power Pin: 1/2(+),3/6(-) ог 4/5(+),7/8(-)
Data Pin: 12/38;DC Jack: 5.5X2.5mm

This doesn’t:

PS5712TG-25 PoE Splitter
OUTPUT:12V/2A; IEEE802.3af/at
Data Speed:10/100/1000Mbps;INPUT:DC44-57V
Power Pin: 1/2(+),3/6(-) or 4/5(+),7/8(-)
Data Pin:12/36/45/78;DC Jack: 5.5X2.5mm

Could it be an issue with the device itself perhaps then?

The PoE supplier can definitely provide enough power. The other odd thing is that the minipc does start up, but then crashes on system load

During boot when loading the config et all the router will use most power. Looking at the product number it’s some Chinese splitter. I wouldn’t be surprised if the output isn’t very stable.

1gbit uses a bit more power than 100mbit so maybe you stay just within the power limits with the 100mbit splitter. Or, the product might be faulty.

I’ll try another one or just switch back to the standard power supply. Thanks for the inputs!