[mesh-dev] DIO Gigabit PoE

[Marc Juul]

On Mon, Jun 22, 2015 at 3:27 AM, Marc Juul <juul at labitat.dk> wrote:

> At Omni we're using TP-Link dual-band home routers (N750) and modifying
> them for PoE.
>
> These routers have gigabit ethernet.
>
> Unfortunately gigabit ethernet and PoE at the same requires special
> ethernet transformers and these routers don't have that type of transformer.
>
> This means that they drop to 100 mbit when we modify them for PoE (but
> only on the port we modify).
>
> I was looking into how to get around this problem.
>
> I thought maybe there was a way to do gigabit half-duplex on two or three
> pairs, but it seems like that's not possible.
>
> BUT! It looks like TP-Link makes a PoE splitter which can apparently
> handle gigabit:
>
>   The TL-POE10R
>
> Here it is for $12:
>
>
> http://www.ebay.com/itm/TP-LINK-TL-POE10R-Gigabit-PoE-Splitter-Adapter-IEEE-802-3af-compliant-5V-12V-/321785705485?pt=LH_DefaultDomain_0&hash=item4aebec340d
>
> I ordered one so we can try it out. If it works we should just do that to
> all of the routers. No reason not to have gigabit if it's only $12 extra
> per router. It's still only $77 total for router + PoE splitter.
>

So, turns out that this thing is expecting 48v PoE. So we could still use
it but we'd need to inject 48 volts. The cheap way to do this is to get a
multi-port passive injector (we already have one) and 48v power supply with
enough power for all of our nodes. I think Jake said he has a 48v supply.

-- 
marc/juul
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