Slower broadband speeds

[#1]

Openreach - the arm of the BT Group who own the infrastructure - appear to be managed/directed by the ghosts of GPO Telephones - their attitude, until you get down to those who actually do the job - the engineers - is 'sod the end user, we'll make life as complicated/contorted as possible'.

[#2]

I'm still not holding my breath, but just wondered if you had any joy getting any further with this?

[#3]

No Help Team staff have picked this up as I hoped they would, but sight of your current Technical Log would help to make me make any further suggestions.

[#4]

[#5 · Accepted solution]

Well, you've had no drops, according to that, since your refresh, and the fact that your downstream SNR is still lower than I would expect for your line length, suggests you have good line.

All I can suggest is that you do what I used to when on FTTC, and check that once a day. If the DSL Uptime drops again, repost, but as it stands I don't think there is anything we can do.

[#6]

That's great thank you. As you suggested in your original post, this does seem to keep on happening though - that's why I keep coming back here.

Very grateful for the extra knowledge - I'll keep an eye on it.

[#7]

I've been keeping an eye on my speeds but just checked and it's down to about 24-26 Mbps (using https://speedtest.btwholesale.com/details). Is there anything that can be done or is it time to get an engineer involved.

Please let me know if you require any more info' tests.

[#8]

How does your Event Log look - any 'DSL down' entries?

[#9]

Hi John,

Here are more details. Yes, I saw these two entries in the Event log:

15:22:00, 16 Apr. DSL Link Down: duration was 2149 seconds
14:45:40, 16 Apr. DSL Link Down: duration was 1704993 seconds

Many thanks, as always.

[#10]

Looking at the Technical Log you have had a couple of drops quite close together this afternoon, and it looks like the DLM has upped your D/S noise margin quite aggressively, presumably in an attempt to stabilise things, so that suggests you have a problem somewhere. Is it possible to select the 'Event Log' on there and then 'Export'. Once you have done that, attach the resulting, file to a new post please.

[#11]

As requested.

EDIT: Just had another short outage.

[#12]

Looks like a repeat of your March episodes, but maybe @Dan_the_Van can comment.

@Dan_the_Van -  those logs claim a D/S SNR of 6.3, but the Technical log is showing the value as 11.4 - strange?

[#13]

those logs claim a D/S SNR of 6.3, but the Technical log is showing the value as 11.4 - strange?

The logs will show the SNR at the time the line resynched, which will be pretty much the same as the target (6db).

I suspect (but dont know for definite) that the tech log shows the current SNR. So assuming the line resysnched at the time of any fault condition , and that condition is no longer there, the SNR will have increased due to the better line conditions.

[#14]

So, a higher SNR is better? I must be losing the plot, because I was always under the impression that one that far away from the target was a sign of problems - or does FTTC work in the opposite direction to ADSL?

Given that the OP's speeds appear to be falling with the higher SNR, this is not making sense - to me. 😕

[#15]

So, a higher SNR is better? I must be losing the plot, because I was always under the impression that one that far away from the target was a sign of problems - or does FTTC work in the opposite direction to ADSL?

No, you're correct a higher SNR is indicative of a problem.

What we seem to have here is varying external interference which is reducing the snr. So when the interference is bad, the line resynchs at. a low speed to reinstate the target 6db. If susquently the interference goes away , the line would be able to synch at a higher speed and still meet the 6db target. However , the line will not resynchs of it's own volition , what will happen is that the speed stats the same and the snr ( headroom) increases.

It's similar to a capped line, it's just that the line is 'stuck';at the previous speed until it's manually resynched.