Secret squirrels 😎😂

I do have a spare ONT somewhere here - left by OR when my connection was not well! I will try to find it.

The exact screw position though will depend on the screw you use. For example, if a 3mm is used the ONT will rest 0.5mm lower than if a 4mm was used.


edit to add:

The Box is 89mm tall measured at the front, but tapers to teh back where it is just 87.

The top of the narrow part of the mounting slot is 38.2mm down on teh back meaning, for a 4mm screw, the centee will be 40.2 down. The larger holes are only 8,2 dia.and teh slot part just 4.54 wide which gives very little tolerance on the horizontal position especially with 4mm screws, 3.5 will be a little more forgiving.

Edited by MHC (Mon 28-Mar-22 15:31:05)

In reply to a post by MHC:

The Box is 89mm tall measured at the front, but tapers to teh back where it is just 87.

The top of the narrow part of the mounting slot is 38.2mm down on teh back meaning, for a 4mm screw, the centee will be 40.2 down. The larger holes are only 8,2 dia.and teh slot part just 4.54 wide which gives very little tolerance on the horizontal position especially with 4mm screws, 3.5 will be a little more forgiving.

Thanks that info is really helpful, appreciate you do those measurements and the advice about the screw sizes.

Anything more? It is sitting on my desk with the vernier calipers!


And try to use pan head screws, or cheesehead not countersunk.

In reply to a post by MHC:

Anything more? It is sitting on my desk with the vernier calipers!

I feel bad asking but am I right in thinking 60mm centres for the screws on the horizontal?

In reply to a post by MHC:

And try to use pan head screws, or cheesehead not countersunk.

I remember a previous thread on here about using pan head or countersunk and there was a split decision on what to use, I for one would typically use pan head for something like this although I remember one of the Openreach guys saying he always used countersunk screws as he felt it held the ONT in place better.

Measuring the slot:

Outside edge to outside edge: 64.66
Inside edge to inside edge: 55.42

(64.66+55.42)/2 = 60.04

The holes:

Outside to Outside: 68.24
Inside to Inside:: 51.88

(68.24 + 51.88)/2 = 60.06


It is fairly soft plastic, and not ideal for measuring precisely so 60mm will be fine.


I always prefer pan head: Try teh fit, if it slides on easily, tighten 1/8 turn, and keep checking tweaking until it is an interferenc fit and held tight

In reply to a post by MHC:

Measuring the slot:

Outside edge to outside edge: 64.66
Inside edge to inside edge: 55.42

(64.66+55.42)/2 = 60.04

The holes:

Outside to Outside: 68.24
Inside to Inside:: 51.88

(68.24 + 51.88)/2 = 60.06


It is fairly soft plastic, and not ideal for measuring precisely so 60mm will be fine.


I always prefer pan head: Try teh fit, if it slides on easily, tighten 1/8 turn, and keep checking tweaking until it is an interferenc fit and held tight

Thanks, I've got everything I need now so its safe to put the vernier calipers away

What about position of the three connectors!

In reply to a post by MHC:

What about position of the three connectors!

Am totally flexible on the positioning of the connectors

You would think only an Openreach employee who doesn’t need continued employment , would be daft enough to steal from their employer and offer the stolen items for sale.
On new builds, there are two categories of install, a standard one , where the OR tech fits the ONT and cover , the developer only installing the OR provided ‘ezibend’ cable from the ONT location to the external wall where the duct appears , and DSI , Developer Self Install , where the developer is provided with sufficient ONT and covers , for the number of plots being built, and is expected to install these as well as the ‘Ezibend’, the developer is paid more by OR for a DSI install than one where OR fit the ONT and cover.
On many occasions this DSI work isn’t done even though the developer has been paid the DSI premium, the OR tech , although only expecting to fit the external CSP do the external splice , has to fit what should have already been fitted by the developer, there is a mechanism to reclaim the DSI cost , but generally it’s not done, it’s easier for the OR tech to simply fit these items themselves , from the stock they carry on board .
The OR provided equipment that was never installed on these DSI jobs are probably those items that appear for sale , no doubt the seller being the electrician or someone within the developers organisation that should have done the DSI in the first place.

Edited by Iniltous (Mon 28-Mar-22 18:21:00)