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ryny24
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GPeR with non-poe destination device

Tue Sep 17, 2019 11:12 pm

Ok, tell me what I am doing wrong. I am trying to get my laptop working with 1 GPeR in line. My laptop does not support PoE, so as per the manual, I should remove the 2 out-side poe jumpers.
In case if the destination device does not support or requires PoE powering, the power passthrough can be
disabled manually by removing both jumpers on the PoE out side.
When the (2) OUT jumpers are removed, I cannot get anything to work. The GPeR never lights up. The switch reports poe "searching".

When I put the jumpers back, I still get no lights on the GPeR. However, if I briefly connect a POE device on the GPeR OUT, like a LHG60G, I get lights on the GPeR, and I can then connect my laptop and it works! (very well too!). However, this won't work if the switch reboots, so what am I doing wrong?

I have tested this with several different GPeR units, all do the same thing. I have tried this on an HP (3500yl) & Extreme (X460).

Thank you
-Ryan
 
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normis
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Re: GPeR with non-poe destination device

Wed Sep 18, 2019 8:41 am

Jumpers disable PoE forwarding to the other end, but you still need PoE power on the input end, to power the GPeR itself.
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ryny24
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Re: GPeR with non-poe destination device

Wed Sep 18, 2019 3:00 pm

Jumpers disable PoE forwarding to the other end, but you still need PoE power on the input end, to power the GPeR itself.
Yes, I have it connected to a 802.3af switch. Power is there, but the GPeR does not power up unless a device connected to the GPeR is requesting POE.
 
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Re: GPeR with non-poe destination device

Wed Sep 18, 2019 3:20 pm

Jumpers disable PoE forwarding to the other end, but you still need PoE power on the input end, to power the GPeR itself.
Yes, I have it connected to a 802.3af switch. Power is there, but the GPeR does not power up unless a device connected to the GPeR is requesting POE.
interesting situation, looks like switch does not start to feed power because does not detect the Gper

Looks like Gper works better with passive PoE not 802.3 PoE
 
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ryny24
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Re: GPeR with non-poe destination device

Wed Sep 18, 2019 4:45 pm

Here are 3 photos that show it will not power up on it's own.

Photo 1: GPeR is connected to 802.3af switch with tester in adjacent port proving power is available. GPeR does not power up. No LED light.
IMG_20190918_093624.jpg
Photo 2: GPeR is connected to 802.3af switch, tester is moved to the GPeR OUT and it now powers up.
IMG_20190918_093726.jpg
Photo 3: Tester is removed, GPeR stays powered up. I can then connect my laptop and it works.
IMG_20190918_093744.jpg
Removing the 2 OUT jumpers does not fix the problem, I can't get it to power up at all then.
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normis
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Re: GPeR with non-poe destination device

Thu Sep 19, 2019 12:37 pm

The 802.3af standart needs to negotiate some things with the receiver device. It works well, if you are connecting through the GPeR to some 802.3af compatible device. But if you are only powering the GPeR itself, with disabled PoE passthrough, it will not work, as the GPeR itself can only be powered by Passive PoE injector. We will clarify this limitation in the GPeR documentation
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troffasky
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Re: GPeR with non-poe destination device

Wed Oct 30, 2019 7:32 pm

Was the product page updated? I don't see anything here about passive PoE:
https://mikrotik.com/product/gper
but
https://i.mt.lv/cdn/rb_files/GPeR-1568972172.pdf
says PoE out is "Jumper selectable passive PoE Passthrough".
 
Zacharias
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Re: GPeR with non-poe destination device

Wed Oct 30, 2019 7:42 pm

That was already mentioned in the quick guide of the product...

This will only work if "PoE in" is served by passive PoE source, as 802.3af/at switches will not be able to power the GPeR itself.

https://mikrotik.com/product/gper#fndtn-downloads

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