ONT Power Supply

How long is the low voltage cable on an Openreach ONT please?

Cheers!

The Nokia one installed here is about 1.5m - but if they change PSU brands it could be shorter though!

All those I have come across have been that too, 1.5 metres

Openreach dosn't say that much abut there ONT units https://www.bt.com/help/broadband/whats-an-openreach...
Most places says 1.5m power lead. Now saying that really the ONT should have distance under 1m from mains power point to ONT. The reasion is that lead should be a little lose and the should not be pulled tightly. So by giving it a little give of at least 0.5m would be recommended.
Cityfibre says for there ONT 1.5m power lead
(Just in case someone search fot this latter on)

Edited by amiga_dude (Wed 11-Aug-21 08:09:22)

If you’re a smidge out of range you could run a short DC extension like this…

https://www.kenable.co.uk/en/cctv-security/cctv-cabl...

Would need to double check if the barrel connector is 5.5mm/2.1mm on the ONT, but you get the idea.

Thanks everyone for responding.

Admittedly FTTP could be a way off yet, although Hawarden is now on OR's list and also on the Welsh Governments list for where they have put some money, so fingers crossed.

Ideally in due course I would prefer the fibre to be run through a 25mm conduit to the rear of our garage which is where the existing NTE5 is located together with my modem/router, but fear an engineer who has other ideas.

So am considering all future options.

Strangely was looking at our village halls BT Hub a few days ago and that had a PSU with quite a long cable, looked like 2 metres plus!

I have used dc plug/socket extension leads to power a remote 7 inch display and other items. Another option being passive POE. But either of these, passive POE, or indeed a 13A socket makes a refusal to use the conduit more likely.

The 25mm conduit totals 6 metres with 4 inspection bends https://www.screwfix.com/p/tower-white-inspection-be...

Hopefully the above conduit would be ok.

Cheers!

With 4 bends they might want to pull it in two stages to avoid putting too much stress on the fibre; but given that these are inspection bends that can be opened, that should be OK. Also, the total length of 6m is pretty short. So I don't see any problem with them using it.

Running the fibre a short distance along the internal wall would be OK too.

It might be possible to terminate the conduit in a surface-mount pattress, and then they could mount the ONT on the front of that as they do in new-builds. I've seen pictures which show how that's done, but I don't have it handy, but I'm afraid I don't have the URL to hand.

In reply to a post by candlerb:

It might be possible to terminate the conduit in a surface-mount pattress, and then they could mount the ONT on the front of that as they do in new-builds. I've seen pictures which show how that's done, but I don't have it handy, but I'm afraid I don't have the URL to hand.

Thanks for that. Would certainly work since I already have a surface-mount pattress on the end of the trunking, currently with the NTE5C mounted on it. http://ancient-mariner.co.uk/public/IMG_1629.JPG

I fitted the conduit prior to having our drop-wire replaced and re-positioned a couple of years ago.

If a copper pair needs to be retained, a NTE5 could sit next to the current pattress/new ONT.

Cheers!

If the ONT goes where the current NTE5 is, or to the left of it, I think a 1.5m DC cable from the spare socket will be fine. On my ONT, the DC entry point is on the bottom (but this is an older model)

There are some docs linked here.

Particularly relevant:
https://www.openreach.com/content/dam/openreach/open...

In fact if OR mounted the ONT, preferably in the casing, on the plywood board as in the photo, I could easily put a 25 mm hole for the fibre. The fibre could come out through the knockout on the back box of the NTE5 and drop down behind the ply. The psu lead could enter the same way.

One question, why most, if not all of the install photos I've seen, have the ONT surface mounted without the casing?

Cheers!

Casing - do you mean the larger enclosure that housed the once Battery Backup Unit (BBU)? If so that was discontinued in 2019.

Now you just get the bare ONT, either Nokia or Huawei depending on the headend.

No, I was thinking of the one candlerb referred to:

In reply to a post by candlerb:

Particularly relevant:
https://www.openreach.com/content/dam/openreach/open...

Cheers!

Difference there is Greenfield (new housing developments, pre-cabled by the developer - backboxes installed the walls etc) vs Brownfield (everything else - just drill a hole through the wall and poke the fibre through).

Greenfield gets the casing and Brownfield don't.

Interesting.

I will have to find out what a new housing development just up the road gets. The fifteen houses are being built on the site of a demolish convent, so planning wise Brownfield.

Cheers!

In reply to a post by Ancient_Mariner:

Interesting.

I will have to find out what a new housing development just up the road gets. The fifteen houses are being built on the site of a demolish convent, so planning wise Brownfield.

Cheers!

Yes not so much from a planning perspective per se, but more from the perspective of new plots, land and developments which have no existing BT/Openreach service connection. In Openreach terminology those 15 new houses would be considered a greenfield site.

In reply to a post by Pheasant:

Difference there is Greenfield (new housing developments, pre-cabled by the developer - backboxes installed the walls etc) vs Brownfield (everything else - just drill a hole through the wall and poke the fibre through).

Greenfield gets the casing and Brownfield don't.

Not always. A recent FTTPoD install (as usual something of a saga) was fitted with a Huawei 1+0 ONT in one of the new cases, it got removed as the ONT was then placed in a larger lockable enclosure with other equipment.

In reply to a post by tdw42:

In reply to a post by Pheasant:

Difference there is Greenfield (new housing developments, pre-cabled by the developer - backboxes installed the walls etc) vs Brownfield (everything else - just drill a hole through the wall and poke the fibre through).

Greenfield gets the casing and Brownfield don't.

Not always. A recent FTTPoD install (as usual something of a saga) was fitted with a Huawei 1+0 ONT in one of the new cases, it got removed as the ONT was then placed in a larger lockable enclosure with other equipment.

Precisely there is zero reason for that case, unless its covering a recessed back box where the incoming fibre enters. So you basically can chuck it in the bin unless you have a double backbox pre-fitted with loops of the incoming fibre within it to hide. Otherwise it serves no useful purpose.

In a typical existing premises / brownfield install they will take the fibre through the wall and take it to where you want the ONT fitted (within reason). The ONT will simply be surface mounted, unless of course the home owner has gone to the trouble of chasing out their wall or cutting out the plasterboard to fit a back box....

Edited by Pheasant (Thu 12-Aug-21 20:01:39)