CAT6: Assembling cable: RJ45 connectors
Per the spec, it seems that the diameter is not compatible with what I bought:

Diamètre sur isolation    1,13mm

while typical dexlan 920880 are designed for CAT.6, STP, AWG 24-26 but:

DIAMÈTRE MAX FILS 1,05 mm


Update: I was able to plug the rj45 connectors to my cable using dexlan 920818 connectors:

One can visually see they are much different from the other ones: