@Kevin_Z 

Thanks for reply.

I didn't receive the email. Anyway, I did enable the 'Fast Roamin' when all Decos are established at the very beginning before other end devices join the network. (I also tried to forget the network and rejoin the network as well)

The ATU-R my ISP provided has internal PPPoE function, so I uses 'Access Point' mode only, so I'm afraid there's no priority option for VoIP devices.

I simplified the diagram as below:

There's no problem when browsing web pages as expected since it doesn't need continuing data transfer.

I just tried big data download using my laptop (Win10 Enterprise 1909 with Intel AC 9560 card), and I go around in the house, most of time the FTP download will timeout 20 seconds when switching to another Deco. Sometimes it can continue downloading without interuption but most of time it will timeout and client will need to re-establish the new connection.

All Decos are not far away. The position of 'Daniel's room'(2F) is on the top of the '1F-router side'(1F), and the 'Brian's room'(3F) is on the top of 'Daniel's room'(2F). All three Decos are nearby the window so I believe the signal should be no problem.

The other two Decos 'Mom's room' and 'Liviing room' are a little bit far but I still believe it's not the big problem. Also, when switching between '1F-router side'(1F), 'Daniel's room'(2F) and 'Brian's room'(3F), the issue still exists. And the interuption always occurs when I'm closing to another Deco. So signal strength is not the problem.

Is it possible a bug in 'Access Point' mode? Or something wrong when using ethernet backhaul? Thanks!

BR,

Daniel Lien

@Kevin_Z 

Any thoughts? 

@Daniel_Lien

I think you misplaced the Main Deco. Take a look at my picture. The main deco has two ports, connect one to the ATU-R and the other one to your internal netwerk.:

@MarcNL 

Hi, as I said I use access point mode only. I don't need router mode since my ATU-R already has PPPoE function. Currently all connection works fine until I move location from one to another.