@Shay972 

Hi, it Is ok to connect another Deco to the main router;

And you might need to set up all the units first according to the configuration guide on the APP.

Then switch the operation mode on the Deco APP from the wireless router to the access point;

Finally, connect the satellite Deco nodes via cable to the ISP router;

Thank you very much.

@TP-Link 

Thank you for your reply

just to clarify

currently I am using operating mode: Access point

Main deco is connected to the ISP router,

you say I can add another deco unit and connect the ethernet port also to the ISP router, and it will get the "signal source" from ISP router

since when I am looking now in the app on second deco, it is saying signal source <Main deco name>, and I don't see option to switch it.

@Shay972 

I run Deco mesh in Access Point mode. My Main Deco is named "Living Room."

My Satellite Deco M5 when connected by WiFi:

Same Satellite Deco M5 when connected by Ethernet cable to ISP router:

This is what you should expect to see. As long as it says "Ethernet," you have Satellite Deco M5 using wired connection for communication with Main Deco and for network traffic.

@Alexandre. 

Nice, Thanks - I will check the cable to the ISP router