Actual size telecom cable single duct introduction?

Hello, I am a bit confused about the statements from Telekom. Basically, it is required to lay either a DN50 or DN75 pipe. But if I look at such a Doyma single-duct entry Quadro-Secura E1/breit, I have planned 2x 5 - 7mm, 2x 7 - 13mm and 1x 12-16mm lines for Telekom. Also, with the multi-duct entry Quadro-Secura Nova 1/breit, I don’t have anything that large but 2x 5 - 7 mm, 4x 7 - 13 mm, 1x 13 - 21 mm. So in that respect, much too small. Or how large are Telekom cables or possibly future fiber optic cables? Is such a single-duct entry definitely sufficient? That would be preferred in my case because I need power + Telekom (water is located at the other house wall).

The fiber optic conduit (into which the fiber is blown afterwards) is 10mm thick and is practically identical everywhere in this size. My Telekom copper/DSL cable is also 10mm thick, but I do not know whether this varies regionally.

The requirement for an empty conduit naturally arises from the fact that the cable to be installed can be pulled in there without digging. Either the empty conduit ends before the house entry, then the pure cable diameter is sufficient as an opening, or special house entries are used that are suitable for empty conduits. These seal the empty conduit from the inside and the outside.

A M25 empty conduit would be completely sufficient on a straighter route. (straight, without bends, etc.) I believe we also laid M32, which then transitioned to DN75 (multi-utility). Attached is a photo of the final Telekom cable (Brandenburg, no fiber optic). As thick as 5x2.5mm2 (approx. 1cm diameter).

To take it to the extreme. On the left, the entirety of all the bell wires from the telecom cable and on the right, the two small wires (bell wire) that ultimately go to the router and realize DSL50 Gbit etc.

In theory, a small straw as an empty conduit would be sufficient.

Great, thanks. So in your case, the empty conduit itself is not "sealed" against the multi-utility connection, correct? That would be what Fuchur meant, that it also exists, but I think it is rather rarely implemented?

Our multi-duct was ordered with 3m of empty conduit to the outside, the remaining 5m to the property boundary was bridged with M32. The trench was only supposed to be opened once when water and electricity were pulled through. We sealed the M32 with well foam in DN75. We do not expect any water accumulation at the M32/DN75 transition nor any pressing groundwater. Therefore, in my opinion, this sealing is sufficient for our case. (pragmatic approach). We have sandy soil, where you can literally see the water simultaneously sinking into the ground.