GS728TPv2 strange behavior all aps' going down.

Question

Hello, hopefully you can help me. The last few days ive installed a GS728TPv2 which power four Ubiquiti u6-pro access points. The cable to each one is cat6a and the cable tester said all is good.

When i setup the GS728TPv2 i updated the firmware to 6.0.10.14 and left the settings initially to the defaults.

Today i opened my phone to run a speed test and it switched to 4g as the access point went down. looking at the logs it looks like all 4 went down at the same time. beyond the 4 aps nothing else is connected to the switch, and this just goes back to the router from the broadband provider currently.

I logged into the switch and saw this on the trap log

and this was the memory log

if it was one or two aps going down then i would think cable issue, but it looks like all 4 went down at the same time. Can anyone give me any pointers what to look at/check please?

Many thanks

Trev

gotty101 · Answer

This is a pic of the port stats&nbsp;

gotty101 · Answer

Just an update. On the section where it lists all the poe port states. Only one evr says delivering power, the othere 3 ports just say searching. When it plays up often the port that says is delivering power would change to another one. I've found when I do a speed test, some times you will see the speed build up and then just drops out and the test fails. But all the access points start flashing live the power has glitched.

schumaku · Answer

The switch web UI page&nbsp; System &gt; PoE &gt; Advanced &gt; PoE Port Configuration would show much more useful information on the current PoE port status, indeed.
&nbsp;
The&nbsp;GS728TPv2 can drive up to 24 PoE+ 802.3at ports and offers a max power budget of total 190W.
&nbsp;
As the other peer we face UniFi&nbsp;https://dl.ui.com/ds/u6-pro_ds.pdf&nbsp;lazily specified as PoE+&nbsp;
&nbsp;
Power method PoE+Power supply UniFi PoE switch48V, 0.5A PoE adapter (optional)Supported voltage range 44—57V DCMax. power consumption 13W
&nbsp;
Ubiquity does still list a lot of confusing and misleading data. in the industry standard&nbsp;802.3af/802.3at/802.3bt arena nobody should have to care about&nbsp; adapters, power information like 48V, 0.5A, or voltage range like 44—57V DC. they are still stuck in their non-industry standard passive power over network cabling terminology.
&nbsp;
802.3at and max consumption of 13W does say everything clear.
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Hard to say what is going on there, looks more like an interop issue.
&nbsp;

gotty101 · Answer

Thanks for the reply, to help test things, today i swapped out the switch and just plugged all 4 ap's into a GS305P and its been totally stable. So its got to be to do with the&nbsp;GS728TPv2 for sure now.&nbsp;&nbsp;ive looked at the&nbsp;System &gt; PoE &gt; Advanced &gt; PoE Port Configuration screen and only one port (only for poe devices and one back to the switch) ever said drawing power, the rest said searching. I hadnt change any of the default poe settings that the switch is supplied with. One thing though was if i unplugged the device that was listed as drawing power then the screen would update one of the other three that where still plugged in and mark that as drawing power.&nbsp;&nbsp;Trev

schumaku · Answer

Hello Trev,
&nbsp;
gotty101&nbsp;wrote:
Thanks for the reply, to help test things, today i swapped out the switch and just plugged all 4 ap's into a GS305P and its been totally stable. So its got to be to do with the&nbsp;GS728TPv2 for sure now.&nbsp;

This does not proof that much - except that we know now these APs are kind of operational off specs, and don't show any signs of information and warning about this.
&nbsp;
The GS305E does only supply 802.3af and max 15.4W - so it's under the requirements set by the AP vendor.&nbsp;
&nbsp;
PSE have two ways to classify a PD and are free to use either. The basic is one used by by most simple 802.3af units is the hardware-based method where a specific resistance is presented when the PSE presents the classification voltage.
&nbsp;
Starting from higher class levels, it's all software-based making use of the the Link Layer Discovery Protocol (LLDP) requirement. And this is where I suspect the interoperability issues might come from. Aside, not the first similar PSE and PD interop issue in this industry - various vendors were affected by similar effects over the time.&nbsp;&nbsp;
&nbsp;
gotty101&nbsp;wrote:
&nbsp;
ive looked at the&nbsp;System &gt; PoE &gt; Advanced &gt; PoE Port Configuration screen and only one port (only for poe devices and one back to the switch) ever said drawing power, the rest said searching. I hadnt change any of the default poe settings that the switch is supplied with. One thing though was if i unplugged the device that was listed as drawing power then the screen would update one of the other three that where still plugged in and mark that as drawing power.&nbsp;