non-af PoE - is it Possible to Control the Voltage Supplied? (RB2011-UiAS-2HnD-IN)

RouterOS General
1

Hello Everyone!

I Just started using my RB2011-UiAS-2HnD-IN
I am aware that it has a PoE OUT on Port 10 which can supply the same voltage as supplied to the device upto 500mA

But, my Question is: can this PoE Out (along with a passive splitter) used to power a device with relatively less voltage requirment (e.g. 12v @ 500mA) if so, Will the Device (RB2011) Automatically detect the amount of voltage to be Supplied or is there some method to control the voltage?



Thanks in advance!

2

It is not possible. But you can power rb2011 with jack and 12V power supply.
On port 10 you have also 12V

3

Hi!


Thanks for Your Previous reply!

I Just had a Continued Question:
Can I use a Step Down Converter (DC-DC 24v → 12v) to reduce the voltage to 12v and then use it to Power the Device?

I am running RB2011 on Adapter only. Shipped adapter was 24v 0.8A. Router is not able to Power another device if i Use a 12v 1A adapter.



Thanks in Advance

4

You can use any power supply that capable of powering 2011 and your device at one time. Notice that PoE-Out voltage can be lower than input one, something near 10V, if powered with 12.

5

I recommend not to fuss with this if you (apparently) have no in-depth electronics knowledge.
It is easy to destroy things and a separate 12v adapter for your device is very cheap.

6

Buying a 12v Power Supply (12v 1A or 12v 2A) could Possibly solve the Problem.
I Get that.

But, My Question was:
If i Separate the Powering Pairs from the Data Pairs & use the Power Pairs as an input on a Step-Down Converter (24v 0.5 A → 12v 1 A) Won’t that work?
Has anybody tried it?


I have used such setups earlier but those were 802.11 AF devices and i used the Step Down Splitter from TP-Link to Achieve it.

as this is NOT a 802.11 AF output, i’m pretty sure that the Out is coming on the Blue & Brown pairs.


and yes, I have basic knowledge of electronics and how it works :slight_smile:

7

This should work, because MikroTik just gives out power, no matter what is connected… if even connected.

8

Sure!

I’d Try it in a few days as i Get time! would Post the Response whether it succeeds or fails.

Main Purpose of doing this is to Power a xDSL modem which is placed far from the MikroTik device and is connected to a Power Plug which is Not on the Backup Power!
this bugs the users in case of Power failures that WiFi works but internet does Not!


Thanks everyone for Your Valuable response.

I will Post a Follow Up Soon.

Maybe Some Day it Helps someone.

9

Indeed it should work, for example with those cheap Chinese stepdown converters (less than 1 euro/piece).
Be careful not to swap the polarity of course, remember this can be done in config.

But still I would not recommend it unless there is some compelling reason like having only one receptacle.
Even then, I would probably connect it using a splitter cable at the power connection of the MikroTik, not at ether10.