Interesting proposition! Although potential of destroying a 50 dollar router is probably no great loss (for some) such hardware hack will hopefully not risk destroying a $5000 switch! :-D In any case, to try something like that would probably mean jumpering one core each from 1&2, 3&6 over to one each of 4&5, 6&7...? Couldn't do both, since that would end up shorting the data pair and at killing the data transmission at best, killing the device at worst ;) So is it probably also a good idea to add a diode to prevent current flowing in reverse, and I suppose a capacitor/resistor pair to take out the data signal? To my mind, with few basic electronics nouse, it seems feasible - anyone else care to comment? I'm thinking: if it is possible to do that, then it is also possible to build it as some kind of adapter... Cheers! Mike.
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Andrew Cox Sent: Friday, 5 September 2014 2:24 PM To: MikroTik Australia Public List Subject: Re: [MT-AU Public] mAP and 802.3af
Who's up for some resoldering? :-)
Thanks for clarifying Mike
- Andrew On 05/09/2014 2:12 pm, "Mike Everest" <mike@duxtel.com> wrote:
Hi All,
Results of some further investigations:
I discovered that my understanding of 'type A' and 'type B' was incorrect - it is not a polarity issue at all, but related to which pairs are used to deliver power.
Type A: delivers power over the data pairs (1&2, 3&6) Type B: delivers power over 'spare' pairs (3&4, 5&6)
The specification apparently requires that to be considered compliant, a PoE device/client 'must' support both types, but a PoE switch/provider 'may' support either.
Apparently mAP will only support 'type B' mode, and so will not work with any switch that provides only type A poe - which is all of the PoE switches that I have to test. As far as I can determine, trhis will be the case with most Cisco PoE switches and probably also majority of other vendor versions.
My personal assessment of the situation is that mAP can NOT be considered 802.3af compliant, without also qualifying that statement to point out that it is only for type B capable switches.
If anyone is aware of a PoE switch that does work with mAP, I will be pleased to learn if mAP does work at all with any variant of 802.3af/at! ;-)
Cheers, Mike.
-----Original Message----- From: Public [mailto:public-bounces@talk.mikrotik.com.au] On Behalf Of Mike Everest Sent: Thursday, 4 September 2014 6:57 PM To: 'MikroTik Australia Public List' Subject: [MT-AU Public] mAP and 802.3af
Hi Folks,
Just a heads-up for anyone who hasn't already discovered, that despite marketing claims that mAP-2n supports 802.3af PoE input and passthrough, we have so far been unable to make it work like that.
We've tried lots of different ways including reversal of the power pairs in case it is a polarity issue (i.e. 'type a'/'type b' deal)
It *does* power up ok using a 48v power supply and standard injector, but that's not what the claims stated ;)
If anyone else has done it successfully from an 802.3af or at switch, there will certainly be a lot of people interested to hear how it is done!
In the meantime, MT official have been mute about it - if they have anything to say (that we are able to repeat) I'll be sure to rpat it here! :)
Cheers, Mike
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