ONT on PoE

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deadlyllama

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#306174 3-Jul-2023 09:19

Has anyone succesfully run their ONT off PoE? I've got an "12V 2A" PoE splitter from AliExpress, but the ONT won't even power on with it.

(note: ONT is a Huawei, we are in a UFF/Tuatahi area)

Why - because you'll ask - the ONT is in the house, all the interesting IT gear is in the garage, I'd love to power the ONT off the same UPS as everything else.

wellygary

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#3098848 3-Jul-2023 09:28

I Doubt the ONT is designed to be powered from PoE, -

You could use a PoE splitter to power the ONT via its socket thou...

https://www.jaycar.co.nz/poe-power-splitter/p/YN8414

CYaBro

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#3098851 3-Jul-2023 09:34

wellygary:
I Doubt the ONT is designed to be powered from PoE, -

You could use a PoE splitter to power the ONT via its socket thou...

https://www.jaycar.co.nz/poe-power-splitter/p/YN8414

Sounds like that’s what the OP has except it’s from AliExpress.

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wellygary

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#3098894 3-Jul-2023 10:17

CYaBro:
wellygary:

I Doubt the ONT is designed to be powered from PoE, -

You could use a PoE splitter to power the ONT via its socket thou...

https://www.jaycar.co.nz/poe-power-splitter/p/YN8414

Sounds like that’s what the OP has except it’s from AliExpress.

Ahh yes, makes more sense now that I read it again....

I think the source of the problem is likely to be AXpress....

Does the OP have a multi meter to see if there is actually any volts on the power output of the splitter??

dasimpsonsrule

147 posts

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#3098899 3-Jul-2023 10:29

Yes, I have done a chorus one, mine is currently running on PoE. I use a TPLink TL-POE10R from PBTech (this comes with standard 2.1mm barrel jack cable), and a "300mm NBN/UFB Power Connection Cable" from Jaycar. I had to solder the cable together myself, and used a multimeter to confirm the pinout

deadlyllama

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#3098941 3-Jul-2023 12:01

wellygary:

I think the source of the problem is likely to be AXpress....

...

Does the OP have a multi meter to see if there is actually any volts on the power output of the splitter??

Oh now that's a really good idea. Should have thought of that before!

raytaylor

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#3100032 5-Jul-2023 07:07

12v POE will drop in voltage over distance really quickly.
But I would expect you should be able to get 20 metres quite easily. Ive done this a couple of times with chorus type 300 ONTs that use a barrel jack but found you will also need to make sure that the POE Y injector and Y splitter are both gigabit capable otherwise it will only be 100mbit.

You can get more distance by using two cables and a soldering iron.
One cable carries the data, and the other cable carries the power - positive on the green12/blue45 pairs and negative on the orange36/brown78 pairs to half the resistance.

Alternatively you could use a standard gigabit 48v af or at POE injector and a gigabit 12v 1.5A splitter for a full 100 metre distance.

I am not sure what model ONT your local fiber co uses, but if its the same as a chorus type 100 I can confirm you need to be very careful about the polarity. If you connect them up with the +/- polarity around the wrong way, they will let a puff of smoke out and die. I have confirmed a pattern (at great cost)

Ray Taylor

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cddt

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#3100035 5-Jul-2023 07:16

I have been warned against using passive PoE injectors as they just shove the voltage down the wires without determining whether the receiving device is capable of handling it.

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MarkM536

307 posts

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#3100338 5-Jul-2023 17:27

I would use a more reputable quality POE splitter like this TP-LINK one:

https://www.pbtech.co.nz/product/NETTPL0010/TP-Link-TL-POE10R-PoE-Splitter-IEEE-8023af-complia

PolicyGuy

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#3100348 5-Jul-2023 17:57

deadlyllama:

Why - because you'll ask - the ONT is in the house, all the interesting IT gear is in the garage, I'd love to power the ONT off the same UPS as everything else.

Buying a Constant Vigil Sentry Lite or Sentry Integrated might be easier: https://www.constantvigil.com/shop

BTW, my only connection to these guys is as a very happy customer

MarkM536

307 posts

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#3100371 5-Jul-2023 18:40

PolicyGuy:

Buying a Constant Vigil Sentry Lite or Sentry Integrated might be easier: https://www.constantvigil.com/shop

I was thinking to mention that.

Although..... using POE may give the option to remotely power cycle the ONT, if you have a managed POE switch with such functionality.