By the way, connections between the modem and the subsequent device have not been telephone cables with TAE sockets for about 20 years, but network lines.
The problem is that with ADSL and VDSL the modem is integrated into the router (Fritzbox) 99% of the time and two wires are enough up to the router. The times of external modems were a long time ago. That is exactly the state of the installers and most unfortunately can’t do more!
These external modems are now coming back through FTTH connections. What if the provider suddenly says there will only be routers with integrated fiber optic modems and that time will come quite fast? Many will be surprised if they have to lay a fiber optic cable to the router inside the house. Either there is no empty conduit or the bending radius of the conduit is quite small and unsuitable for fiber optic cables. Unfortunately, construction is done with very little foresight here!
Yes, exactly! And now? Demolition, new building? Compensation? Or nothing at all?
Look at what was done before plastering! If you don’t know, then you should ask someone who knows, and I don’t mean the electrician who did it.
First, I would check if it’s stated anywhere in the contract that the router comes into the office and must work with the FTTH connection. If yes, then I would tell him to build it that way so that it works. If he says the cable cannot be replaced, then I would confront him with the subject of the empty conduit. If nothing is stated about that in the contract, then it could lead to disputes, although the topic of the empty conduit is still in the room.
If nothing works anymore, I would build the router in the HWK in the room corner that is most central in the house and hope that everything is covered. Then you simply cannot use all the comfort functions of the router.