Power Over Ethernet Question

[Narked Diver]

Hi,

I’ve run out of ports on the back of my AirPort Extreme so I’m looking to buy a switch to add some more ports

As I have a Hue Hub and a Raspberry Pi currently connected via Ethernet I figured I could buy a PoE switch and then add a couple of PoE splitters to power these devices

My question is is there anything particular that I need to look out for when buying the splitters other than ensuring that they have the correct power adapter fitting?

For example if the switch supplies 48v and the Pi requires 5v do I need to ensure that the splitter only supplies 5v or can I buy any old splitter and the Pi will only draw the voltage that it needs?

Thanks in advance

 

[belvdr]

The voltage must be near identical, usually within 5-10%. Amperes, or amps, can be different but the supply side must exceed the load, usually by 10-20%. Usually all PoE devices conform to one of the specs at 24 or 48 volts.

 

[elf69]

we use PoE here at work.

we find the extractors do not work very well in some cases.
how ever injector/extractor kits do work.

we mainly use PoE for our cisco IP phones which are 48v.

 

[Narked Diver]

Thanks for the help folks

I’ll make sure the splitters have an output voltage that matches the input requirements of the two devices

 

[HenryAZ]

Despite the bit of extra clutter (which is in the laundry room anyway), I much prefer PoE injectors for each device. You can match the devices's PoE power standard/requirement exactly (there are a few standards), but you also eliminate the PoE switch, which runs hot and uses fans, which can fail over time.

 

[phrehdd]

What will be the power source for this power over Ethernet?

 

[Narked Diver]

I’m using a netgear gs108pe switch