topic Re: ZF7782 and PoE on second eth port in Access Points - Indoor and Outdoor

ZF7782 and PoE on second eth port

jason_reich — Wed, 28 Oct 2020 04:01:40 GMT

Hello, we have several ZF7782 still operating in our network, and I'm looking to utilize the second ethernet port with PoE. We're currently running them with 802.3af, but want to use enable the second port with PoE. I've read the spec sheet and install guide a few times, but still have questions.

I'm only looking for basic 802.3af on the second ethernet port (not the high power 25W). In the documents, there is mention of 802.3at and of 60W power supplies (which I'm guessing are non-standard 802.3at). No mention of 802.3bt of course, as the APs pre-date that standard.

So to use 15W 802.3af on the second ethernet port, what power needs to be supplied on the primary ethernet? Can it do that with 30W 802.3at? Or does it need the Ruckus-specific 60w injector?

And are there any recommended injectors for this setup? It doesn't seem easy to find the ruckus 60W injectors (902-0180-US00) as the ones listed seem to often have other specs or photos, so not clear of their actual power and compatibility.

I've seen injectors on Amazon and elsewhere calling themselves "Ultra PoE+"that say they are 60W af/at/not-bt, but can't find much if that is a semi-standard or if that is what the ZF7782 is looking for. (Example model: TrendNet TPE-117GI) Any thoughts on those?

thanks in advance for any advice you can help explain this corner of haziness!

Re: ZF7782 and PoE on second eth port

harald_thomas_c — Wed, 28 Oct 2020 06:21:18 GMT

you wrote 25w by .af, .af is 15W.

if you want to passthru .af (15W) you need to power the ap with .at (30W).

As far as I can remember, we used the original injector that was shipped with the AP.

But a standard .at PoE injector should also work.

Re: ZF7782 and PoE on second eth port

scott_edwards_8 — Wed, 28 Oct 2020 12:36:06 GMT

Mfg.Part: 902-0180-XX00 (Where XX is the Country Code)

Example: US is 902-0180-US00

Who ever your primary vendor is should be able to source, but normally its 4-6 weeks right now. If you seek else where, be careful of knock-offs..

Re: ZF7782 and PoE on second eth port

jason_reich — Wed, 28 Oct 2020 14:25:51 GMT

I agree that .af is 15W, but the documentation for the AP says that .af/.at up to 25W is possible on the 2nd eth port, if the 60W injector is used. But it never says what input power is needed for 15W on the output. Unclear.

Re: ZF7782 and PoE on second eth port

john_olsthoorn — Tue, 05 Jan 2021 10:02:10 GMT

Hi Jason,

You may have figured it out already, but 30W 802.3at input on the 7782 should be enough to have 15W 802.3af on the second ethernet port, and you can use an ethernet switch or a 30W 802.3at injector for that.

Best regards,

John