Hacking tp-link POE

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set321go
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Joined: 14 Jan 2009
Posts: 24

PostPosted: Sat Jul 21, 2012 11:23    Post subject: Hacking tp-link POE Reply with quote
Hello,

I have just purchased a tp-link TL-WA901ND (http://wiki.openwrt.org/toh/tp-link/tl-wa901nd) and was pretty miffed to discover that PoE was not 802.3af compliant, as the reason for buying it was to use with my poe switch.

using the provided PoE injector it powers up.

I took the injector apart and it looks like pin 4 + 5 are +ve (the pin in the middle of the power connector) and 7 + 8 are -ve. power plug is 12v 1A

As far as i can work out this is the pin configuration for PoE in passive mode.
http://pinouts.ru/Net/poe_pinout.shtml

Is it possible for me to hack my access point to work in active mode with my GS108P?
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feliciano
DD-WRT Guru


Joined: 24 Oct 2008
Posts: 655
Location: Venezuela

PostPosted: Sun Jul 22, 2012 2:53    Post subject: Reply with quote
Dude, no need to post such a high size photo.

Code:
that PoE was not 802.3af compliant
Not totally true. It it compliant, using the spares (modeB): http://en.wikipedia.org/wiki/Power_over_Ethernet

Quote:
Is it possible for me to hack my access point to work in active
Note that Active PoE means using the same line as data, so you really want to do it? The difference between active PoE and passive PoE will be the availability of negotiate power requirements among equipments. If you want to go ahead (because I think your switch doesn´t power up your router), you have to add some resistance between pins to fool the switch at power up and then remove it. Something like the attached picture:
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telepath
DD-WRT Novice


Joined: 31 Aug 2012
Posts: 2

PostPosted: Fri Aug 31, 2012 13:49    Post subject: Reply with quote
feliciano wrote:

Code:
that PoE was not 802.3af compliant
Not totally true. It it compliant, using the spares (modeB): http://en.wikipedia.org/wiki/Power_over_Ethernet

Not entirely true either. The 901ND uses a 12V Power-Supply, while 802.3af uses 40V. So there is, in fact, no way to supply the AP with power from a PoE switch.
LeTallec
DD-WRT Novice


Joined: 23 Oct 2012
Posts: 2

PostPosted: Tue Oct 23, 2012 14:22    Post subject: Reply with quote
Is this a passive PoE and will it be possible to power up a 24v dc equipment with it if the power supplied is 24v 1a from the adapter.
xnetprox
DD-WRT Novice


Joined: 07 Nov 2012
Posts: 3

PostPosted: Wed Nov 07, 2012 21:51    Post subject: Reply with quote
You can still power your AP via POE. Just buy a 12V POE splitter from Panoptic Technology like this: http://www.panoptictechnology.com/network-smart-adapters/

It's fully 802.3af compliant, so it will work perfectly with your POE switch.
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