Power over ethernet
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Posted by on July 15, 2008, 12:40 am
Please log in for more thread options couple of mods on the internet to put POE on a WRT54 I decided to build my own. The mods I saw involved hacking the box and I was not fond of this idea since especially since my case started to crack when I tried to get the halves apart. I picked up a couple of double wall connections from the Home Depot . I connected the #1 jack to the #2 jack on the same outlet except for the wires used for power. On these I connected the output of my wall wart power suppy. On the other end I did the same connecting the power plug removed from same wall wart to the power leads on #1 jack. Realizing someone may cross up some wires and blow up their router like this I tried to do a little idiot proofing. AT the box used at the router I connected a little bridge rectifier removed from a modem board with the AC terminals gong to the line and the + and _ terminals going to the appropriate terminals on the power jack. Yes I am being intentionally vague with these directions. Those with the appropriate amount of electronic savy should have no problems. This should work for about any wall wart powered device. | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by DTC on July 15, 2008, 1:50 pm
Please log in for more thread options Way too complicated. What I've done several times when I couldn't get AC power to the Linksys, I ran a "poor man's PoE" with splicing the power leads in to and out of the CAT5 cable at both ends. Takes only five minutes and a few beenies (white telephones connectors), but regular crimp connectors would work. | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Mark McIntyre on July 15, 2008, 5:38 pm
Please log in for more thread options DTC wrote:
> jimmie68@gmail.com wrote:
>> Today is my day off so I had a little time to piddle. After seeing a
>> couple of mods on the internet to put POE on a WRT54 I decided to >> build my own. >
> Way too complicated. What I've done several times when I couldn't get > AC power to the Linksys, I ran a "poor man's PoE" with splicing the > power leads in to and out of the CAT5 cable at both ends. Yup, I ran an Actiontec router like that in my conservatory for some years. > Takes only five minutes and a few beenies (white telephones connectors),
> but regular crimp connectors would work. I did it with some insulating tape.... its only 5v. | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Jeff Liebermann on July 16, 2008, 11:24 am
Please log in for more thread options On Tue, 15 Jul 2008 22:38:58 +0100, Mark McIntyre
>I did it with some insulating tape.... its only 5v.
Only the WRT54G v1 and *SOME* v1.1 versions used 5VDC power. I never could get one to work through a mess of CAT5 because the router required exactly 5.0000VDC to work correctly and the relatively high current through the copper produced excessive voltage drops. Later WRT54G versions were supplied with 12V 1A wall warts, and included a wide range regulator that works from about 4.0VDC to 18VDC. Those worked very well with the method you detailed. I've done much the same thing, but without the electrical tape. I use shrink tube. Ever wonder why real PoE uses 48VDC? It's to reduce the current through the CAT5 cable and RJ45 connectors. At a constant power level, running something at 5VDC requires approximately 10 times the current of running it at 48VDC. Voltage drop and heating are related to current, not applied voltage. Also, the RJ45 connectors are rated at 1A max per pin. The WRT54G will not exceed the 1A max rating, but higher current devices might do so. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 | |||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by on July 16, 2008, 12:39 pm
Please log in for more thread options
Jeff Liebermann wrote: > On Tue, 15 Jul 2008 22:38:58 +0100, Mark McIntyre
> > >I did it with some insulating tape.... its only 5v.
>
> Only the WRT54G v1 and *SOME* v1.1 versions used 5VDC power. I never > could get one to work through a mess of CAT5 because the router > required exactly 5.0000VDC to work correctly and the relatively high > current through the copper produced excessive voltage drops. Later > WRT54G versions were supplied with 12V 1A wall warts, and included a > wide range regulator that works from about 4.0VDC to 18VDC. Those > worked very well with the method you detailed. I've done much the > same thing, but without the electrical tape. I use shrink tube. > > Ever wonder why real PoE uses 48VDC? It's to reduce the current > through the CAT5 cable and RJ45 connectors. At a constant power > level, running something at 5VDC requires approximately 10 times the > current of running it at 48VDC. Voltage drop and heating are related > to current, not applied voltage. Also, the RJ45 connectors are rated > at 1A max per pin. The WRT54G will not exceed the 1A max rating, but > higher current devices might do so. > PoE seems to be used a lot in HVAC and Alarm systems now that a lot of the controls and sensors are LAN based. I havent seen PoE used extensiely in any other way. Jeff, as always your accurate and thoughtful comments are always appreciated. I had offered my way of hooking it up because I was thinking of mounting a WRT54 in the cupola on my garage. I had seen methods on the internet that suggested the router be opened up and diodes be placed inside the router and connections to the power supply be made inside the router. I had also coome across the simple methods suggested by others here in this thread. The first I considered way too much trouble and the second way too dependent on me wiring it up and not goofing something up. Its posible the router may already have some reverse polarity protection, even if this is the case I dont want to have to troubleshoot the reason the router isnt working. By using a small bridge rectifier at the router end it allows me to connect the power supply at the other end with either polarity reducing the reason my setup could fail. The extra few minutes I spent building my adapter is insurance against an extra trip into my attic. Jimmie Jimmie | |||||||||||||||||||||||||||||||||||||||||||||||||
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> couple of mods on the internet to put POE on a WRT54 I decided to
> build my own.