@lukass2000  

-50's is PLENTY as long as it's clean.  I have stable 225 Mesh links in the mid -80's.

I suspect you have a noisy channel or voracious clients.  What is the EAP225 reporting as Interference (the orange part of the 5G blue/green/orange signal bar)?

To debug, I suggest you disable any client SSIDs on both the 610 and 225 on the 5G band (so only broadcast client SSIDs on the 2.4G channels of each AP).  That allows each device to use it's 5G radio exclusively for meshing and doesn't have to fight with clients for BW. 

It's a little hard to find, but I do this by creating a new Wireless Profile for 2G only.  From Settings->Wireless Networks->  use the pull down arrow on the list of WLAN Groups.  At the bottom you will see an Option to create 'Create New Group', select this, and then then use the option to copy all SSIDs from the existing profiles used by the 610 and 225 EAPs.  I called mine something like 610_2Gonly and 225_2Gonly.  Then edit the SSIDs in the new group to remove 5G radio, and then apply your new profiles to the two APs in question.  This makes it very easy to revert.

If that doesn't work, I have a second idea for you.

  @paparazz01 

Hi,

So what does your noise profile look like on the 225 end?  For instance, here's mine:

and what does your frequency map look like?  Basically the WiFi Traffic Distribution graph from the Dashboard is a good start?

what channel are your AP's meshing on, and is there activity on adjacent channels?

  @paparazz01 

Ok, try forcing your wired node 5Ghz channel to be 149 (ie don't allow automatic channel) and make sure the 5Ghz power setting on each AP is set to HIGH.  Ch 149 allows for higher power and greater bandwidth if you aren't using other channels >149.  You'll probably see the mesh node Isolate and then re-adopt.  Also make sure both 225's are on the same firmware version, at least 5.0.5.

If you still have stability issues on 149, and you've removed your client SSIDs from the 5GHz band, you can set your channel back to auto (20/40/80) which is how I run mine.  That way if there is temporal interference, the mesh APs can dial back to a single 20Mhz channel and in exchange for less bandwidth you should get better throughput.  I would advise against restricting access to the 20Mhz channel when meshing, and never restrict it if you have clients attempting to connect to 5Ghz.  Even a single 20Mhz channel should be good for 80Mbps+ with reasonable signal quality/strength....about what you'd get with a 100BaseTX ethernet port.

As a side note, please remember that setting a 40Mhz channel, means you are bonding 2 channels together, in this case 149+153 so do not use 153 for any other purpose in range of the APs meshing on this frequency.  80Mhz would bond 149+153+157+161...which consumes most of your high power 5.8Ghz channels

Channel                  Freq                                              Channel Size

  @paparazz01

Glad to hear that worked out for you!  Thanks for letting me know.