Which area is this?

I would suspect they are doing something to the port in the OLT that the CBT is connected to, to get service back e.g. rebooting the port. If it was low light all the time it is unlikely anything remote would fix. Would be interesting to know if the light level went up significantly when they do this, or if you are marginal when they do the remote work.

This sounds like a physical issue with the OLT port you (and up to 31 other people) are connected to. Everything between the OLT and your house is passive, so unlikely to stop working after a few minutes.

An issue with light levels on the PON is 100% Openreach, nothing to do with the onward link via BT Wholesale, so Openreach need to fix it. They need to get someone to look at what is going with that OLT port, I'd be changing the SFP for your port as the first point of call.

As others have said if BT cannot get Openreach to look at this then escalate to more senior teams, if you escalate to both OR and BT in one e-mail be warned Clive's team will dump it back on BT to resolve despite the fact it is their issue. Been there had point out very firmly that it was Openreach that had a major issue with a fibre first install for 100+ houses so BT wouldn't be able to fix it.

In reply to a post by Ad_G:

An issue with light levels on the PON is 100% Openreach, nothing to do with the onward link via BT Wholesale, so Openreach need to fix it. They need to get someone to look at what is going with that OLT port, I'd be changing the SFP for your port as the first point of call.

As others have said if BT cannot get Openreach to look at this then escalate to more senior teams, if you escalate to both OR and BT in one e-mail be warned Clive's team will dump it back on BT to resolve despite the fact it is their issue. Been there had point out very firmly that it was Openreach that had a major issue with a fibre first install for 100+ houses so BT wouldn't be able to fix it.

There is pass bucking going on. Which sadly happens when you have a organisation like BT group. Our concern is how to get this OP's fttp fixed. Its clearly a hardware or network issue, which could be part of a bigger issue.

In reply to a post by witchunt:

Which area is this?

Grove Park exchange area in London.

In reply to a post by Ad_G:

I would suspect they are doing something to the port in the OLT that the CBT is connected to, to get service back e.g. rebooting the port. If it was low light all the time it is unlikely anything remote would fix. Would be interesting to know if the light level went up significantly when they do this, or if you are marginal when they do the remote work.

The difference is very significant I was told (-70 vs -15 or something like).

So today, thankfully, no one showed up, so they must be doing something outside. I even had connection stable for just over an hour, but then back to red again. Just awaiting some news from BT...

The repeated change in light levels (that your ONT detects when it puts the Red LOS light) very much looks like the pluggable device (SFP) at the OLT in the exchange is unstable or “flapping”.

From what you’ve described you may be one of few (or perhaps the only one) on the PON served by that particular port / device, as you are an early adopter on a newly built part of the network. There could otherwise, in the fulness of time, be up to 29 other customers served by the same port / pluggable. If the problem is at the card level more customers would in turn be potentially affected.

Keep at them and escalate as high as you see necessary to resolve.

Thanks.

So the update from BT is this (after looooong conversation): "it is CA fault so it is the network box and they have replaced it so by morning they will confirm and close the fault " LOL

Somehow I doubt that its going to be fine in the morning as if they replaced it already it would have been working by now.

‘CA fault’ nooooooooo

CA = Customer’s Apparatus

A lie in other words. Unless they haven’t replaced it and will do so before 12pm tomorrow

I can't see how an ONT fault would cause low light levels at the CBT.
More BS by the sounds of it.