Introduction
When my ISP (Scarlet) told me I needed to switch to fiber, they didn’t have a good offering that suited MY needs. In preparation, I pulled fiber and Cat6A from the ground-floor entry point to the first floor. Having that available, along with the existing phone line on the first floor, gave me all the flexibility I needed to choose an ISP that best suits my needs as I transition from VDSL to fiber.
Flexibility and creative transition from VDSL to fiber cabling
When I pulled the fiber cable (armored SC/APC, which has a better chance of surviving the stress of being pulled through the wall conduit) and the CAT6A S/FTP, I still had to keep the telco line I needed for the VDSL connection to my home office. As I wanted a decent finish on the wall, I had the fiber, CAT6A, and phone cable terminated into RJ45 connectors. As I still needed the splitter, which is an old-style 6-PIN, I improvised a go-between until I moved to a provider that offered “reasonably” priced fiber. The picture below was my temporary workaround. I connected the old Belgacom TF2007 to a UTP cable that terminates in an RJ45 connector. That way, I could plug it into the RJ45 socket at the back, which I connected to the existing phone line in the conduit. It also still has the splitter that connects the phone line to the VDSL modem for internet access.

Back view
Front view
Now. I no longer need the phone lines. Fiber comes from the ONTP on the ground floor to the first floor via the wall conduit. There, it connects to another fiber cable that runs into my home office. Here I can use the ONT or plug it into an XGS-PON/GPON SFP+ on my router/firewall. The CAT6A runs back down to provide wired Ethernet connectivity for devices I need there, including DECT telephony. At any time, I can have the fiber run to a router on the ground floor and use CAT6A to provide Ethernet on the first floor.

I can now disconnect this temporary solution.
Conclusion
So, be a bit creative during transitions, and you can deliver a flexible, solid solution, even in older houses.
