PoE Switch hat not working

Question

So I got the new raspberry pi 3 b+ and also bought the PoE switch to power it using Ethernet.

https://uk.pi-supply.com/products/pi-poe-switch-hat-power-over-ethernet-for-raspberry-pi

I don't know if I am doing something wrong, because it is not powering the pi. (you can ignore the white cable, it was there just because without it, the pi doesn't start) I hold the power button of the hat for a couple of seconds but nothing happens.

Do I need the PoE injector? https://uk.pi-supply.com/products/tp-link-poe-injector-tl-poe150s

Shouldn't the hat work directly just like it is using the normal Ethernet cable from my router?

I get Ethernet connection through the hat, but only if connected with power supply

Answer 1

you require the Poe injector

the PoE injector supplies around 50V into the cable, so you do not have run separate power to a device

it is useful for powering things like APs (access points) in a shopping mall where it would be a pain to run AC power into the ceiling where APs are usually mounted

Answer 2

If you use an injector, you lose the ability to power-on a cold Pi. But if the Pi is connected either directly to a POE switch, or indirectly through a POE Splitter (described below), if you disable and re-enable the port on the switch, the Pi can be booted from a cold state. A few more elegant (and cheaper) POE options are:

Option 1 (in terms of lowest price): POE Splitter For £10 you can get this POE Splitter from Amazon.co.uk and it requires NO hat! Plug it on the far end of an Ethernet cable which is connected to a POE switch and your Pi boots. The monitor shown is a Pi touchscreen which makes the Splitter look large, but it has a small form factor.

Another benefit of the POE Splitter is that it leaves all your GPIO pins free as it moves the POE capabilities off of the Pi and puts it in front of the Pi.

Option 2: POE Hat: Or, you can can spend £20 (inc VAT) and get a real POE hat- plug it into an Ethernet cable connected to your POE switch and the Pi powers on. I use this model and it works like a charm: I just plug it into my POE switch and the Pi lights up.

https://shop.pimoroni.com/products/raspberry-pi-poe-hat

Both options work out of the box with no significant tinkering required. HTH- Terrence Houlahan

Answer 3

I read in the more info section here, :

Includes optional jumper that toggles the power functionality If you keep the jumper on, your Pi PoE will power on after holding the power > button for two seconds If you take the jumper off, your Pi PoE will power on as soon as you apply power from your injector

For it to work with the power button, as you're trying to do, the jumper must be on. Have you checked this?