@DirtySanchez  I believe it would work as long as the unwired CPE broadcasts an SSID and  Router 1 has the ability to join that network

                             (WDS Bridging).

                             I have done similar by joining my router to a wireless network using the 2.4 or 5ghz radio with WDS Bridging, but not all

                             routers have this ability. I had two TP-Link Routers and the newer of the two did not support WDS Bridging.

  @RickJamesBish 

thanks for your message.

Router1 wouldn't join another network.

It's just broadcasting it's own standard wifi signal which would be used by the 1st cpe510 and transfered over 30meters to the second 510

If I configure the fist as AP mode, it seems to require a cable connection to the router to get its signal? Did I miss an option to to it via wifi instead of cable ? Do you know that ?

greetings 

  @DirtySanchez I need to know the make / model of Router 1 in order to assist more.

  @RickJamesBish 

Hi again,

its not about router1, it could be any rounter. Lets just say "existing wifi" .

I want to feed the 1st CPE510 with a wifi singal not with a cable. The setting has to be done in the 510. The Routers are irrelevant :) I dont know how to set the 510 up correctly so its using wifi to act in AP mode.

  @DirtySanchez The router is not irrelevant. If the CPE you are referring to is in AP Mode, the Router needs to join the Wi-Fi being broadcast by that AP. In order to do that you need to enable WDS Bridging, if the router has it, and join that CPE AP Wi-Fi as a client.  With the settings you described its either WDS Bridging from the router to the CPE or an ethernet cable between the two.

In order to connect them the way you explained, by having the CPE AP join the Routers Wifi, you will need to use a mode other than just AP mode. I think there is an AP Client Mode but not sure how that works.

  @RickJamesBish 

its called FritzBox 7590

  @DirtySanchez The nearest I can find to WDS Bridging is this. I am not sure it will work because it is potentially proprietary and may require another FritzBox compatible device to connect to. It would not hurt to try it. It seems to setup the same way WDS Bridging does. You enable it, scan for the Wi-Fi, choose the SSID that matches the CEP in AP Mode, enter the password for that Wi-Fi network and join it.  It is either going to connect or not. If it don't work, just walk back in the steps and disable it.