PoE over Devolo adapters

O

ossey33

n3wb
May 14, 2015
11
0
I am mapping out my domestic IP camera installation and was considering for convenience, using a power line adapter like the Devolo. However the set up I would want is a PoE camera, do you think that PoE would work over a set up like this?
Thanks
Ian
 
I don't know a lot about your Devolo device, but traditional power line adaptors are NOT capable of sending POE over them. Power line adaptors work on the principle of sending a range of frequencies of the electrical subsystem that can be separated from the noise coming from the electricity itself. I would guess that you could fry these units if you are to plug in an ethernet cable carrying your power (POE) into the unit.

Your best bet, if you are looking to use power line adapters and POE is to follow something like the below.

Router --- Power Line Adaptor --- Home power grid --- Power Line Adaptor --- POE Switch --- Camera
 
Thanks for the prompt reply. What you describe is exactly how I had imagined my set up to be.
Cheers
Ian
 
This is what I thought it might look like.
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Do you think this looks OK?
 

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This would not work I don't think. You are placing the PoE injector in the line before the network hub. This means you are sending power over the ethernet before it gets to the hub. This is generally not a good thing since the electronics in the hub are not capable of taking the power through them. You would have to place the PoE after the hub and before the cameras in this case I think.
 
Your PoE injector(s) is/are in the wrong place - presumably it's needed to power the PoE cameras.
And presumably your '5 port hub' is actually a switch. A hub would not handle the camera traffic - a single collision domain and usually 10Mbps each and aggregate.
*edit* and presumably not passive injectors unless the Ethernet cable to the cameras is very short, just a few feet.
 
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thanks for the advise guys. So get this straight PoE won't pass through a basic £10 switch / hub?
 
PoE won't pass through anything, for the most part. You need the PoE injector or PoE switch to be the last thing in line before the camera.
 
And watch out for 'passive injectors' which simply apply a power supply output to the spare wires in the cable. For these you'd also need an equivalent 'splitter' and a fairly short, low-resistance cable.
And 'active injectors' such as in the PoE switch recommended above which implement the 802.3af standard that the Hik and other PoE cameras use, so that power can be reliably and safely supplied over a long cable.
 
Thanks Alastair. the run of cable will only be few meters to each camera. However should I still be worried using passive rather than active?
Cheers
 
I think @ruppmeister suggestion of the PoE switch is sound:
Yes, one injector for each camera. Or you could replace the 5 port hub with the PoE switch that is popular around her and eliminate the need for the hub and the injectors.

http://www.amazon.com/TP-LINK-TL-SF1...rds=poe+seitch
Click to expand...
I'd avoid passive injectors and splitters. They'd need to be close to the cameras, you need a mains feed for the injector power supplies, they'd probably be awkward to get at if you had problems.
The PoE switch can be located where it's easy and convenient, and will support long cable runs to the cameras. Easy to power cycle the cameras if needed.
 
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Hi I'm sorry to bother you again with more questions but, I've ordered a HIKVISION DS-2CD2032-I PoE Bullet cam. I only want one (so I don't require the 4 port injector) camera to watch over my motorbike, and the cable run from the proposed injector will be approx 3 meters max. The injector will be in the loft space out of the elements.

Would this single injector be enough to power the camera? The camera spec requires 5 to 7w at 12v, however all the injector specs don't quote watts only volts and amps.
Ubiquiti, POE-24-12w, Output Voltage 24VDC @ 0.5A - https://www.ubnt.com/accessories/poe-adapters/ [FONT=Helvetica neue, Helvetica, Verdana, sans-serif][/FONT][FONT=Helvetica neue, Helvetica, Verdana, sans-serif]Thanks Ian[/FONT][FONT=Helvetica neue, Helvetica, Verdana, sans-serif][/FONT]
 
From what I can see - the range in the link you provided is specific to the Ubiquiti products, and is not a standard PoE injector.
There is no mention of the required 802.3af standard, which nominally supplies up to 48V for use by the PoE convertor within the camera.
By the way - DC power (watts) is simply Volts x Amps. So 24V at 0.5A is 12W.

We need to search the forum to find what others have successfully used and would recommend.
I have not had to use any, its been either PoE from the NVR or individual 12V 1A mains adaptors connecting to the separate power lead on a camera.
Just tried a search - too many hits!
 
Thanks again Alastair. Now i understand the power calculation this will make it a bit easier to work out if an injector is up to the job.
Cheers
Ian
 
If all you are looking for is a single PoE injector to run the single camera, I recommend getting with @milkisbad here on the forum. He has some single cable injectors that he sells just for what you are looking for.
 
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