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55 posts

Master Geek
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Topic # 179189 30-Aug-2015 20:48
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Hi

I'm looking for a new cordless home phone. At present there's no power outlet near where I'd like the handset, but there is an ethernet port with POE available. Ideally the phone will be VOIP.

After searching the web, I can find base stations that run over POE (and current front-runner is Yealink W52P). However the handset still needs power via a standard power outlet. (Several retailers (e.g. Pbtech, Ascent) list the W52H (additional handset) as POE, but from what I can tell from the Yealink website that isn't correct.)

Are there any cordless handsets that are powered via POE, or is that just not possible given the need to charge the handset battery? Or are there other options (before I contact an electrician and get a power socket installed)?

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  Reply # 1376610 30-Aug-2015 21:01
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Like any cordless phone the handset needs 230V to charge the phone. If you don't have power, you're not going to be able to charge it.

PoE isn't going to help you because the charging cradle for the phone has no Ethernet socket. You could however buy or simply make your own RJ45 <-> 2.1mm DC cables up to run 5V or 12V (I can't remember off the top of my head what the Yealink's use) via the usual 4/5+7/8 passive pins on the structured cabling.


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  Reply # 1376641 30-Aug-2015 21:41
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If you're going to put low voltage power down the cable I'd recommend putting a fuse in the line where you're feeding the power in.

 
 
 
 


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  Reply # 1376642 30-Aug-2015 21:42
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oxnsox: If you're going to put low voltage power down the cable I'd recommend putting a fuse in the line where you're feeding the power in.


I've never ever seen a fuse anywhere on a low voltage system whether it be passive or active PoE.



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  Reply # 1376648 30-Aug-2015 21:51
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Guess it depends on how much current it draws, and the cable length.

Its just the way I'd do it if I was making up this solution.
As I'd think typical POE voltages are 24 - 48volts




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  Reply # 1376653 30-Aug-2015 21:56
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sbiddle: Like any cordless phone the handset needs 230V to charge the phone. If you don't have power, you're not going to be able to charge it.

PoE isn't going to help you because the charging cradle for the phone has no Ethernet socket. You could however buy or simply make your own RJ45 <-> 2.1mm DC cables up to run 5V or 12V (I can't remember off the top of my head what the Yealink's use) via the usual 4/5+7/8 passive pins on the structured cabling.



That was what I was trying to get at - clearly I need a way to supply power to the handset for it to charge.

It looks like the Yealink uses 5V 600mA for both the base station and the handset. Sounds like an interesting idea to make my own cable to supply power. I'll give it a go unless another solution arises.

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  Reply # 1376678 30-Aug-2015 22:11
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A $1 POE splitter cable at reach end will work fine, but you'll just have the RJ45 at the phone end that's unused.

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Master Geek
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  Reply # 1376897 31-Aug-2015 10:01
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Hi 

The W52P is an excellent choice for a VoIP DECT handset.

If your switch or router doesn't already supply PoE then sbiddle's suggestion of a poor-man's "PoE injector" is the cheapest/easiest solution. Something like this at each end would be the go, just leave the ethernet part disconnected:

http://www.gowifi.co.nz/power-over-ethernet-poe/passive-poe-injectors-splitters/tycon-poe-injector-2.1mm-socket-poe-inj-led-s.html?keyword=PoE+injector

If however your switch already has PoE and you were wanting to leverage that then you could look at utilising a true PoE standards compliant DC switchmode power supply like this:

http://store.arduino.cc/index.php?main_page=product_info&cPath=11_15&products_id=148

You'd have to put it in a box and wire up some connectors, but it would do the job.

HTH :)

Pete


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  Reply # 1376991 31-Aug-2015 11:47
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speed:
http://www.gowifi.co.nz/power-over-ethernet-poe/passive-poe-injectors-splitters/tycon-poe-injector-2.1mm-socket-poe-inj-led-s.html?keyword=PoE+injector

If however your switch already has PoE and you were wanting to leverage that then you could look at utilising a true PoE standards compliant DC switchmode power supply like this:

http://store.arduino.cc/index.php?main_page=product_info&cPath=11_15&products_id=148

You'd have to put it in a box and wire up some connectors, but it would do the job.



Just thinking about that an option would be a TP-Link 802.3af PoE splitter such as the POE10R which are about $20 to buy. These take 802.3af in and support switchable 12V, 9V and 5V output via a 2.1mm DC connector.

Looking at a WE52P the standard power supply is 600mA output, I'm not sure what these would put out.






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Master Geek
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  Reply # 1377019 31-Aug-2015 12:33
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I saw that one from TP-link when searching for PoE splitters last night. There are some others but they seem to be at least 4x the price.

It turns out that the shop down the road has the POE10R in stock, as well as the Yealink W52P. Now I just need to get there during working hours.

The POE10R datasheet says at 5V it'll output a minimum of 100mA and max of 2A, so it looks as if it'll fit the bill perfectly. Plus, my switch has PoE already so no injector required.

Thanks for the advice.

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  Reply # 1377052 31-Aug-2015 13:39
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sbiddle:
oxnsox: If you're going to put low voltage power down the cable I'd recommend putting a fuse in the line where you're feeding the power in.


I've never ever seen a fuse anywhere on a low voltage system whether it be passive or active PoE.



That's because its internal to the power supplied used for it.






Richard rich.ms

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