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POE port showing 0.0 W
Posted: Mon Apr 30, 2018 12:46 am
by lacibaci
I have a single port to power a small USB fan (5V, 1.8W) that most of the time shows 0.0 W power. Is it because there is no ethernet link? I am using POE splitter from Wi-Fi Texas (WT-AF-USB
)
Cable check shows: Open, Open, Open, Open
Re: POE port showing 0.0 W
Posted: Mon Apr 30, 2018 9:03 am
by Julian
It's just not drawing enough current for the sensor to pick it up reliably - Since they're analog devices, there's a certain noise factor on them that we filter out in software, and your fan's not coming up above the low limit threshold very often.
Doesn't seem to be a functional defect, in other words.
Re: POE port showing 0.0 W
Posted: Mon Apr 30, 2018 9:42 am
by jakematic
I can confirm this - have a PoE thermometer that doesn't draw enough to show watts, but other devices like RPi do with the same splitter.