topic Re: Distance between ONT box and router? in Full Fibre

Distance between ONT box and router?

craggyducks — Thu, 02 Oct 2025 14:37:05 GMT

I am about to upgrade to Full Fibre 145 and I am being told on the ordering screen that the ONT box and the router need to be close together. However I think the ONT box is going to be installed on the opposite side of the room to where my Hub 2 router will be. I was thinking of buying a 5 metre ethernet cable to cover the distance between the two with each device plugged in at opposite sides of the room.

Can this be done without causing any issues?

Re: Distance between ONT box and router?

MisterW — Thu, 02 Oct 2025 14:40:55 GMT

@craggyducks

Can this be done without causing any issues?

In a word, yes!. The maximum length of an ethernet cable is 100m. Just make sure that you get a cat5e or better (cat6 or 7) cable.

Re: Distance between ONT box and router?

bmc — Thu, 02 Oct 2025 14:48:51 GMT

@craggyducks

Unlike FTTC, routers do not need to be near the Full Fibre ONT as they connect via an ethernet cable.

I would hold off buying any new cables until such time as the ONT is on the wall and you can "see" clearly what is required for you. Note - the is a certain leeway as to where the fibre comes into your property and the location of the ONT. The latter does need a power source. With my install, the fibre came in at the same point as the copper wire but the fibre cable was then run round to the back of the front room. It was stapled to the skirting board.

You discuss it with the installer on the day.

Brian

Re: Distance between ONT box and router?

craggyducks — Thu, 02 Oct 2025 14:54:11 GMT

Thank you both very much, I feel reassured now and can press on with my order.

Re: Distance between ONT box and router?

mwwagain — Sat, 04 Oct 2025 00:14:49 GMT

@craggyducks wrote:

I am about to upgrade to Full Fibre 145 and I am being told on the ordering screen that the ONT box and the router need to be close together.

This is only because they only supply a tiny length of dubious quality ethernet cable with the Hub, and also assume you'll use the same double outlet mains socket for both.

Re: Distance between ONT box and router?

craggyducks — Sat, 18 Oct 2025 09:51:47 GMT

Sorry, just seen this. I've bought a certified 5 metre Cat 6 cable ready. Thank you.