ᐅ Adding Additional Telephone Outlets for Internet Throughout the House

What you could also check is whether the cables are embedded in the plaster or run through an empty conduit.

In the cloud, I have a photo of the junction box as an example.

That really doesn’t make any sense.
You can only hope that they installed an 8-core cable and just refurbished the old junction boxes.
Unscrew one of those boxes and take a photo of the cable.

The glass box with the yellow sticker is only for things that don’t concern you.

The white box with the pig-pink sticker belongs to the telecom provider; apparently, the “line” that brings your “All-IP” into the house connects at the TAE outlet underneath it.

At night, all cables look gray. If you strip about an inch (a hand width) off the end of these kilometer-long cable rolls, you can show us much more useful information.

To simplify, there are three types. “Telecom cables” have pairs of four wires each: the first four are red, and the second group of four is green; they always belong together in combinations like No mark / Single mark and wider/narrower double stripes. There are also versions with only one group of four wires in color (white/red, black/yellow). Other telephone cables often have eight wires: the first pair is red/blue, and for the other pairs (yellow, green, brown), the a-wire is always white.

“Network cables” also have paired wires belonging together (solid color and striped, in blue, orange, green, brown). Look up TIA 568 A or -B. When connecting to the socket, pairs are arranged as 4/5, 3/6, 1/2, and 7/8.

I would avoid using more TAE outlets beyond the “first TAE” and instead use network sockets consistently. For double sockets, always choose a design that can be operated with two cables (so 8/8).

If you use LSA(+) sockets, using special punch-down tools is strongly recommended.

It also helps to read up a bit so you can distinguish between routers/access points and DECT/Wi-Fi.

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So, here are the pictures. The cables are unlabeled and not embedded in the wall. They come once from the ceiling (first floor) and once at ground level from the wall.

There is some good news, but also some bad news.

Let’s start with the bad news. According to the color coding, these are not network cables but JYSTY cables, which were typically used for ISDN wiring. You can try installing a network socket on both ends and test if it works. If the cable isn’t too long, this might work quite well, but it’s not guaranteed.

Maybe your biggest advantage is that the cables are in a conduit. You could try swapping the cables. If you’re not very skilled with DIY, I would recommend hiring an electrician for this. Maybe there is one in your circle of friends or family. Pulling cables can be quite fiddly, and they usually have some tricks to make it easier.

There is another low-effort solution. You can put the router into the living area. Connect the TAE socket at the router with the TAE socket at the main distribution point (APL). Then you’ll also have to move the HUE Bridge.

Overall, looking at the pictures and the related discussion, I wonder if the developers are stuck in the last century. Judging by the number of cables, they didn’t really skimp on quantity, but apparently, they didn’t think spending a little extra for current CAT cables was worth it.