Loss of Service (LOS) on FTTP

After having ~ 5 months of a rock solid FTTP service, I've noticed that the dreaded red LOS light has appeared on my ONT and the service has been down all morning:

https://s33.postimg.org/ejz4wxqgv/ont.jpg

I've already informed my ISP who said they will get Openreach to investigate ASAP.

Am i right in thinking the fault on the PON will be somewhere between the exchange and the ONT? Can an OR Engineer accidently disconnect my line at the splitter or agg node whilst doing some other work?

Could be and ONT failure, or a Tech could have accidentally damaged/disconnected, or the fibre could have been damaged by a third party - road works, branch hitting if overhead, ... plenty of reasons and once OR get to look they will soon know where it has occurred.

Nothing was on the lunchtime update from Openreach for new FTTP faults.

Is LOS solid red, blinking slowly or rapidly? The same for the PON, or is that off completely?

Oh dear .... that is unusual.

Am i right in thinking the fault on the PON will be somewhere between the exchange and the ONT? Can an OR Engineer accidently disconnect my line at the splitter or agg node whilst doing some other work?

Correct, except the accidental disconnect *shouldn't* happen.

Could be anywhere, if lucky the engineer who attends will have an OTDR to measure to the fault (not many carry them, in fact no one on 'my side' has one, so leg work required.

Have a quick squint at the CSP outside, nothing obvious there is there ?

In reply to a post by AndyHCZ:

Nothing was on the lunchtime update from Openreach for new FTTP faults.

Is LOS solid red, blinking slowly or rapidly? The same for the PON, or is that off completely?

It's a straight red PON Andy, look at the photo BF posted.

Yeah, I just wanted to check if any of the lights are flashing every 0.5 sec or 2 sec as you can tell if the ONT is faulty from this.

I believe on the 4 port Huawei, if the LOS is sold red then PON should intermittently flash on/off every 0.5 sec.

I believe on the 4 port Huawei, if the LOS is sold red then PON should intermittently flash on/off every 0.5 sec.

Never witnessed that .... Never yet met a faulty one either.

Thanks. PON light is completely off and LOS is solid red. Fluidone have arranged for a SFI visit as I guess OR haven�t found anything wrong at their end. CSP outside looks ok so I suspect the ONT has gone tits up

I guess OR haven�t found anything wrong at their end.

Except it should test operationally down, so the remote test doesn't see your ONTE's serial number on the head end in the exchange.

And one would hope the present of the upstream light signal being present or not would be noticed