Anyone know the correct dimensions for the new ONT housing

Openreach have published the following fact sheet but the sizes quoted for the new ONT housing/case that can hold either a Huawei or Nokia 1+0 ONT is clearly wrong as the sizes quoted are for the larger legacy case that also housed a BBU, the new one is a smaller compact case which appears to be slightly bigger than a double socket.

1+0 ONT factsheet.pdf

Does anyone know what the correct sizes are?

That's not a ‘larger legacy case’ shown in your link ....

not seen one of whatever it is, but it’s not the old style housing.

The case holds the ONT at one end ( the right hand side shown in the photo) and the other end is for cable management.
The ONT can still be mounted directly without the case if required

In reply to a post by witchunt:

The case holds the ONT at one end ( the right hand side shown in the photo) and the other end is for cable management.
The ONT can still be mounted directly without the case if required

Thank you for the info.

118mm x 181mm according to the developers guide from October.

In reply to a post by AL66:

118mm x 181mm according to the developers guide from October.

Many Thanks

In reply to a post by Zarjaz:

That's not a ‘larger legacy case’ shown in your link ....

not seen one of whatever it is, but it’s not the old style housing.

This video may be of additional interest

More Info on new case

would be nice if they had thought to provide suitably spaced holes to fit over a single back box. looks like it could be done as the ont sits to one side

Edited by threelegs (Fri 01-Jan-21 17:51:11)

From the developers guide "The enclosure fits over a standard single or double back box, with mounting holes that allow horizontal mounting over a double back box or vertical mounting over a single back box."

An interesting document.

A few queries,

1) it appears to be for installations where the FTTP is via an underground duct? Are these casings also used for an overhead FTTP installation?

2) I note that the pre-connectorised cable is available in 2, 5, 10, 15, 20 & 30 metre lengths. What happens if the longer lengths are a few centimetres too short?

3) What/where does that black connector connect to?

4) This new casing with external capping does not seem to utilise a CSP?

Sorry to be a pain!

Cheers!

1. The document appears to be based on new build sites. The casing is just that, a casing .... UG or OH doesn’t really matter how it’s fed.

2. Awwww, come on Clive, if cable is too short, you fit a longer cable. Simples.

3. Can’t actually trawl through the whole document... which ‘black connector’ ?

4. The male to female connector is designed to be used behind a capping, so no CSP. Seems dumb to me. If there’s a fault at this connection, you’ll need to bring into a CSP to form a new splice anyway. Has clearly been done so this work does not require the installer to be able to splice, a cost saving

Thanks Zarjaz for your reply.

Re the cable length, on page 14 where it gives the available lengths, 2, 5 10, 15, 20 & 30 metres, my query was what to do with say an excess of perhaps 9 metres? But it does say, "Any unavoidable extra slack should be stored in a no drill zone wall cavity, taking great care not to loop the cable tightly as this will cause the cable to fail." (Shades of keyhole surgery. )

I can see now that the "black connector" (also on page 14) I referred to is actually protection for the external connector during installation. "Ensure the black capping is kept on the external cable to avoid damage to the connectorised components.".

Cheers!

In reply to a post by tdw42:

From the developers guide "The enclosure fits over a standard single or double back box, with mounting holes that allow horizontal mounting over a double back box or vertical mounting over a single back box."

Thanks for pointing that out as I had missed that info first time around

I think they should put more openreach logos on the housing, there's at least a few square centimetres that haven't been branded yet.

In reply to a post by tdw42:

From the developers guide "The enclosure fits over a standard single or double back box, with mounting holes that allow horizontal mounting over a double back box or vertical mounting over a single back box."

why not either way mounting on a single box?

In reply to a post by threelegs:

why not either way mounting on a single box?

Just the way they have incorporated fixing points into the enclosure by the looks of it, in the video there is a shot of the mounting template at 0:12 showing the screw locations. There is a closeup of the interior at 1:11, the way the moulding is arranged there isn't anywhere suitable for a second screw with 60.3mm spacing on the long axis centreline.

It appears the enclosure incorporates locations for coiling additional fibre and securing a fusion splice protection sleeve - maybe flexibility to handle BFT installations, even if they are not currently envisaged, or repairs.

As with the 1+1 ONT & BBU enclosure it replaces there doesn't appear to be an option for fibre entry anywhere other than the rear - there are two cable entry knockouts (one for ethernet, one for power) for use when horizontally mounted, and similarly two for use when vertically mounted. Rear entry is fine for new build, but there will be cases installing at existing premises where the enclosure would not mount over the cable entry point.

I like the idea of a case to keep everything neat and tidy but I always worry about extra layers that may reduce air flow and when located in a warm equipment room could cause the unit to run hotter than if it wasn't in a case.

Have seen fibre cables coiled up in double back boxes but does anyone know if coiling excess in a single flush cavity back box would also be OK as I would prefer that and a stand alone ONT than the new type case.

In reply to a post by dect:

Have seen fibre cables coiled up in double back boxes but does anyone know if coiling excess in a single flush cavity back box would also be OK as I would prefer that and a stand alone ONT than the new type case.

My FTTP was fed in through the existing duct which comes up the exterior wall, straight through the wall in to an NTE5Aa Master Socket.

No CSP's are being installed here yet. My install took about 15 minutes.
They used the fibre that's black for the exterior and then peels to reveal a white interior. It took him about 5 seconds to peel the black exterior off by pulling a blue string between the white and black layers. The string cuts through the black exterior like butter.
Very neat and tidy.

The engineer has left about 30cm of the white internal fibre coiled up in the back box of the master socket.

The neighbours install is the same but with about 15cm fibre coiled up behind the master socket. His was installed by a different engineer.

I'll take pics of the back box with the coiled fibre later if I can get in behind the couch.

Thanks j0hn83 that is very helpful.

In reply to a post by tdw42:

In reply to a post by threelegs:

why not either way mounting on a single box?

Just the way they have incorporated fixing points into the enclosure by the looks of it, in the video there is a shot of the mounting template at 0:12 showing the screw locations. There is a closeup of the interior at 1:11, the way the moulding is arranged there isn't anywhere suitable for a second screw with 60.3mm spacing on the long axis centreline.

It appears the enclosure incorporates locations for coiling additional fibre and securing a fusion splice protection sleeve - maybe flexibility to handle BFT installations, even if they are not currently envisaged, or repairs.

As with the 1+1 ONT & BBU enclosure it replaces there doesn't appear to be an option for fibre entry anywhere other than the rear - there are two cable entry knockouts (one for ethernet, one for power) for use when horizontally mounted, and similarly two for use when vertically mounted. Rear entry is fine for new build, but there will be cases installing at existing premises where the enclosure would not mount over the cable entry point.

as the housing is only plastic just do as i did with the original large ont and bbu case, drill different access holes to suit

In reply to a post by dect:

I like the idea of a case to keep everything neat and tidy but I always worry about extra layers that may reduce air flow and when located in a warm equipment room could cause the unit to run hotter than if it wasn't in a case.

Have seen fibre cables coiled up in double back boxes but does anyone know if coiling excess in a single flush cavity back box would also be OK as I would prefer that and a stand alone ONT than the new type case.

My earlier Huawei ONT is the old BBU style, it barely registers any heat/warmth. The ONT is nameplate rated at 12W. Cracking open a spare/defunt ONT here only reveals some LSI logic, couple of cylindrical caps, and inductor or two and an ethernet magnetic transformer module. No heatsinks at all. Most of the heat is in the plugpack supply. I'd expect the newer ONTs are much the same.

Standard UK back box is 75x75mm, enough to safely accommodate bend radii for G652 (and better bend radii) single-mode fibre.

Edited by Pheasant (Sun 03-Jan-21 12:35:52)

In reply to a post by Pheasant:

My earlier Huawei ONT is the old BBU style, it barely registers any heat/warmth. The ONT is nameplate rated at 12W. Cracking open a spare/defunt ONT here only reveals some LSI logic, couple of cylindrical caps, and inductor or two and an ethernet magnetic transformer module. No heatsinks at all. Most of the heat is in the plugpack supply. I'd expect the newer ONTs are much the same.

Standard UK back box is 75x75mm, enough to safely accommodate bend radii for G652 (and better bend radii) single-mode fibre.

Thank you Pheasant.

In reply to a post by dect:

I like the idea of a case to keep everything neat and tidy but I always worry about extra layers that may reduce air flow and when located in a warm equipment room could cause the unit to run hotter than if it wasn't in a case.

As others have said the ONT doesn't generate much heat. From SIN506:
Nokia 1+0 ONT (G-010G-Q) Input: 12V, 0.5A. Max. power consumption is less than 4W.
Huawei 1+0 ONT (HG8010H5-20) Input: 11-14V, 1A. Max. power consumption is 2.3W.
and for reference, the previous models:
Huawei 1+1 ONT (HG8110H-20) Input: 11-14V, 1A. Max. power consumption is 4.7W.
Huawei 4+2 ONT (HG8240) Input: 11-14V, 1A. Max. power consumption is 8.5W.