Using ISDN daisy chain for fibre cable run?

Tech, TV, Mobile, Internet and Geek Corner
1

Im thinking of moving to Fibrebroadband.

The OTO is in our private Waschkeller, by the switchboard. Not a great place for the main wifi router as its pretty much a faraday cement bunker .

The house 2004 is wired in all rooms with what i guess is ISDN phone cable (dual RJ45 in a daisy chain with what looks like some UTP 4x2 cable)

I actually would like the modem in my study, which ironically is right at the end of chain, about 40m total run, going through five prior dedicated wall sockets.

I did find this ancient thread. https://www.englishforum.ch/tv-inter…-ethernet.html

Im not sure there is space left for another cable. Is there any point keeping the ISDN wiring at all in 2022?

If I do run a cable Im thinking cat 7 or 8 rather than fibre extension as Im not sure the fibre would like the five sharpish bends to come through the first five sockets.

Thoughts appreciated.
Daniel

2
have you looked at these standards? G.657.A and G.657.B.

3
When we had fibre fitted, Swisscom removed all the old ISDN and copper wire cables, so there was plenty of space. If I'm not mistaken all phone calls are now VOIP so no need for that redundant cabling.

4
My friendly electrician was over for something else today, confirmed that ISDN wiring bus was completely redundant and said he could get 3x Cat7 cable through the run. This would be for example one to each room we use as home offices and one at the TV point.

But that would mean using the ISP router in bridge mode probably and driving the wifi from my current ASUS router etc.