Thanks both. I would like to know the length of the longest white Fibre Optic cable that VM use inside the house (from the wall socket to the ONU). According to VN engineers, it's only 15m. The reason I want a longer cable is to move the ONU from it's current location to be in the living room, closer to the router, as the room currently it's sitting is not convenient. I don't want to relocate the wall socket to the living room either as it's not a easy job. There are 30m cables available on Amazon and wondering whether this will be of the same specs as the VM ones.
https://www.amazon.co.uk/dp/B08MBBBZ4P/ref=twister_B08PDPBRFY?_encoding=UTF8&psc=1
Can I also use another 15m cable with a coupler to extend the length of the current one?
All the ideas will be helpful