RT N66 loses 2.4Ghz signal when there is a POE ipcam connected

[MichaelR64]

Hi,

I am having problems withmy RT N66u wifi router.
And i am running out of answers ...

My situation:
I am running a RT-N66U wifi router from my meter cupboard.
In the cupboard i also have a HP1408 switch and a ups and a NAS, fibreglass modem etc.
Connected to the switch was, among others, my IPCam which was powered with POE.

I am running 2.4 and 5 Ghz wifi. All was running fine.
Except for a couple of weeks ago. The 2.4 Ghz band was failing, clients could connect but they had no Internet, this also sometimes happened on 5 Ghz band.

I tried all fw versions and then gave up and ordered a new one, this time RT-AC66U.
To my horror this showed the same problem. I then connected my faulty N66 router in my living room just to test the wifi stuff.
Bingo ! all stuff started to work fine then.

I then returned the AC66 and reinstalled the N66.
Since it had to be something in the cupboard i just disconnected everything until it started working.
Testing was done quite easy with my ipad and speedtest.net, when all was fine i had speeds of 45Mbps up and down.
With the problem i mostly couldn't even connect to the wifi, even when it was just 0,5m away from the cupboard.
It turned out to be the POE injected webcam.
Disconnected the power and problem gone. So i ordered a new POE injector.

The new POE injector arrived today but my problem is just the same !

As soon as i connect the ipcam to the POE injector the problem manifests itself.
But the ipcam with POE has always worked in the past together with the rest. And the ipcam has recently been changed because the other unit was faulty.
The ipcam itself works ok with POE and streams video etc.

The problem manifests itself only when the cam is connected to the injector AND the injector is connected to the switch.
Connecting the injector and cam directly to the router, instead of to the switch doesn't fix it.
Connecting the injector to the switch doesn't expose the problem, unless you also hook up the ipcam to the injector.
Connecting the cam to the injector and supplying power ofcourse but leaving the injector disconnected from the switch while keeping it all in the cupboard doesn't show the problem.
I changed the cabling to cat5e for the injector and cam, doesn't fix it.

So what is it in a poe injector that makes it interfere with a 2.4ghz wifi band ?
And this only happens when there is a (electrical) connection between a injector and a switch. And it only happens when the cam is connected to the injector at the same time, probably because then there is a load on the injectors psu (?).

Does anybody recognize this ?

thx for any advice.

 

[MichaelR64]

So 123 views and no one has any ideas or advice here ?

 

[wouterv]

I suppose the POE injector induces some disturbance back into the router.
Use of good CAT6 patch cables may be crucial.
Keep in mind that the Asus routers are intended for home usage.
POE is more intended for professional equipment.
Like routers and all technical equipment, the price / quality factor of your POE injector may be relevant.

 

[MichaelR64]

Well I tried cat6 cables, does not matter here.
Poe is also used in the home, so I don t make this distinction here.
What's funny is that it did work previously.
I changed the poe injectors.both of them show this behavior.

Sent with Tapatalk from my smart phone.

 

[wouterv]

Brand/type POE injector?
What about the camera as problem maker?
Maybe the router has a power supply issue (low voltage, noise).

 

[MichaelR64]

The problem manifests itself with two different poe injectors.the last one a brand new level one. The camera is also changed, since it was defect for another reason. The routers were also changed, since I even ordered a new rt ac66.


Sent with Tapatalk from my smart phone.

 

[wouterv]

Did the problem allready exist with the old camera?
With the new router, did you also use its new powersupply?
Brand/type POE injector?

 

[MichaelR64]

Thx for your answer.but all info you mentioned is already in the openings post.
The problem is there with the old Cam and with the new Cam. But with the old Cam there has also been a period in which no problems arose.

Sent with Tapatalk from my smart phone.