FTTP is becoming unstable

[iniltous]

If LOS ( loss if signal ) comes on , even briefly, then the connection is lost and the system is down ( so no speed ) if it was a brief outage then comes back on ( after successfully rejoining the PON ) the speed will be as it was , you don’t get a situation where the headend negotiates a lower speed to aid stability or anything like that….obviously you shouldn’t get LOS  at all, if you do it needs reporting , no point speculating what it could be , it could be anything, OLT, dodgy splice, ONT , ONT tail contamination etc.
While the system is up , providing your profile is correctly set , your connection speed is what you pay for , this is between the OLT ( headend ) and ONT….any third party speed testers are not under OR/BT control and any results from them are indicative at best .
You share your PON with others , a splitter is 1/32 but this is restricted in practice to a maximum of 30 ( it may be less ) , but obviously an early adopter may have pretty much the entire PON bandwidth to themselves ( 2.4GB down/1.2GB up ) but as more customers join the PON , because the bandwidth is shared , if some of these are intensive users , ( basically hammering their connection all the time ) it can affect the bandwidth available to others, testing at quiet times , could give an indication of this.
As already said , first and foremost,  if you are getting LOS , it needs investigation

[Bowdon]

I'm going to wait to see what happens when the router reboots again in 2 weeks to see if it corrects itself.

These problems started on the previous reboot just over 2 weeks ago. Then as it was coming up to the next reboot thats when the LOS happened.

I did BT's own speed test and it said I was getting the speeds I was before. If this is accurate then it suggests that the router isn't fully working as it should. Hopefully on the next reboot it will fix itself. If it doesn't I'll bring it to the FTTP teams attention to see what they suggest.

I find it difficult to imagine that me on my 500Mb connection isn't able to reach 500Mb at any time of the day. I'd imagine at some point of the day I would be able to reach 500Mb (it usually tested at 520Mb) on a speed test.

I was the first to connect to the pole when FTTP became available. It only became available around here in May. The problems started in August.

[JonMace]

500Mb is 62.5MB you are comparing different units together

1MB = 8Mb

[Bowdon]

@JonMacein your example wouldn't the 62.5MB be the transfer rate of a 500Mb connection?

[JonMace]

62.5 MB would be high for a transfer rate because of overheads so anything near that on a 500Mb connection is great

[Bowdon]

It got up slightly higher than that as I think they provision over 500Mb on the connection.

But since these troubles started its been down at 43Mb. But it doesn't stay there consistantly.

I'm going to wait until the next router reboot and see if it corrects itself. I'm hoping it will.

I got my fingers crossed lol.

[Bowdon]

I tried doing a reboot of the router today. But still the same result.

I got 440Mb on the fast.com site, and 447Mb on the thinkbroadband site.

I think something as gone wrong somewhere along the line, especially with the LOS going off.

Before all this all my tests came back to at least 500Mb.

I should add that the upload speed seems unaffected. I'm getting the 70Mb.

[JonMace]

440 on a 500 connection sounds fine to me

[Checked2013]

@JonMace No, that's not okay, plus with the LOS light keep coming on there is definitely something wrong that needs attention.

[Keith_Beddoe]

@Bowdon 

You will get up to 500Mb, depending on how many other users that you share with, are doing. It likely to vary quite a bit. If you are getting 440-470mb, then that would be near the top end.