Helfen Sie mir bitte, das Verkabelungsgeheimnis im Netzwerkschrank meiner Wohnung zu verstehen

Dear Swiss gurus and people who knows network cabling particularities.

The situation is:

1) In my apartment I have several Swiss multimedia outlet (Kombidose / Kombi-Anschlussdose?) that contain 2 RJ45 sockets (LAN + phone?), 3 power sockets and several sockets for coax cables connection . You can see it on a photo 1.

2) I’m connected to my current provider via copper line. And router is connected to one RJ45 socket. You can see it on a photo 2.

I never used any outlets in other rooms.

3) I also have a network cabinet in a storage room, where a fiber-optic socket was installed recently. You can see it on photo 3. So, I’ve decided to switch my current 500Mbit provider to another one that offers 10Gbit via fiber-optic (Galaxus, btw). I’ve got a new router from him, connected to fiber-optic socket, I see that Internet led is on – there is a connectivity.

4) Network patch panel in the cabinet looks like this – check photo 4 (sorry for the quality). You can see that the second row of this black patch panel is fully used by short cables which are connected to white lan sockets (bottom line), these white sockets probably go directly to rooms outlets.

Now I want to start using rooms outlets and get 1GB lan connection in every room. But I cannot understand how I should connect my new router to lan sockets in the network cabinet. I tried to connect cables from my router to the first row of the black panel – no signal. I have a lan tester and it shows that every socket in the first row has the same shortage connection – 3<-7> and 4<->5.

The most confusing thing is – if i disconnect ANY cable in the second row of the black panel – my „old“ router starts showing „No connectivity“ and I have no internet connection. Don’t understand why it happens and what should I do to be able to connect my new router to network cabinet patch panel and get lan connection in every room’s outlet.