In reply to a post by DrSteve:

In reply to a post by baby_frogmella:

Are you getting the same TBB results during daytime or in the middle of the night? If you are its unlikely to be congestion and something to do with the Zen's routing.

Yep, speeds are the same pretty much any time. Haven't tried middle of the night but have run tests after midnight and before 7am on a Saturday morning

In that case i would PM Zen's Senior Core Network Engineer, Jonathan Green (username: jongreen84) on these forums.

In reply to a post by DrSteve:

and around 60-80 for single thread, but this will burst to 150+ for brief seconds.

Looking at Paul's test he's getting full speed on both tests from very early on. Mine seems to start with a decent speed then slowly decline. Could this still be a sign of congestion?

I'm wondering if this could be at least partially caused by an incompatible MTU setting somewhere, perhaps being set too high or low at your PC or router respectively?

No doubt someone else will comment as to whether I'm barking up the wrong tree or not.

If single is low, then DSLreports is probably going to report higher as likely to be using a lot more than 8 downloads for the main test

Others do okay on Zen https://www.thinkbroadband.com/speedtest/15399894232...

In reply to a post by MrSaffron:

If single is low, then DSLreports is probably going to report higher as likely to be using a lot more than 8 downloads for the main test

Others do okay on Zen https://www.thinkbroadband.com/speedtest/15399894232...

Yep. DSL reports is using about 32 threads in the download test and 16 up.

This might be a shot in the dark but could the fact that my installation required 2 of the connectorised cables to be spliced together have any impact? Would I be correct to assume that if the joint wasn't 100% then the ONT simply wouldn't sync and I'd get no service at all?

A total bum splice would give you no service, and the red LOS light lit on the ONT.

A duff splice would give a high light loss reading, and this might cause some intermittentcy in the service.

I doubt your suggestion is the cause of the speed issues you are seeing.

In reply to a post by Zarjaz:

A total bum splice would give you no service, and the red LOS light lit on the ONT.

A duff splice would give a high light loss reading, and this might cause some intermittentcy in the service.

I doubt your suggestion is the cause of the speed issues you are seeing.

Yeah, thought that would be the case. Really running out of ideas at this point!

So having spoken with Zen again they can't explain the results. I have run multiple speed tests to their test page where they can see the single thread speed but report that they can see burst speeds of nearly 200mbps on their end. This really doesn't translate into real world performance since the final result remains about 80mbps or lower.
They have advised that raising a fault with Wholesale would be difficult since they are unlikely to class this is a fault. In addition if they do accept it and send the engineer it would be a £198 bill if no problems are found.
Really don't know what to do at this point. Am I expecting too much?

In reply to a post by DrSteve:

So having spoken with Zen again they can't explain the results. I have run multiple speed tests to their test page where they can see the single thread speed but report that they can see burst speeds of nearly 200mbps on their end. This really doesn't translate into real world performance since the final result remains about 80mbps or lower.
They have advised that raising a fault with Wholesale would be difficult since they are unlikely to class this is a fault. In addition if they do accept it and send the engineer it would be a £198 bill if no problems are found.
Really don't know what to do at this point. Am I expecting too much?

Did you PM Jon Green as I suggested earlier? He will know what's going on with your line far more than Zen's phone support staff as he is a Senior Network Engineer at Zen.

On the other hand, is the TBB speedtest the only place where you get less than ideal single thread speedtests? If so and you're easily hitting ~40 MB/s in other downloads, then you really don't have anything to worry about. I would just put it down to a routing issue with Zen to TBB's servers. As I've said before, my 300 Mbps FTTP line also gives me strange TBB single thread results (often less than < 100 Mbps) and after comprehensive testing by my ISP, they found nothing wrong with my line. Virgin Media users also get similar behaviour on the TBB tester.

Considering all the hassle you went through in getting FTTP installed, it may be easier just to accept things as they are and move on if Zen have told you there's nothing more they can do.

Edited by deleted (Thu 08-Nov-18 12:16:57)

Hi.
Tried the Jon Green thing but he doesn't seem to accept PMs on the forum. I sent one to Ajays to see if he would pass on the message though.
Getting similar results on DSL reports. If I set it to 32 threads then I'm getting nearly 310 mbps. Single thread in the same ball park as TBB.
Downloads from the web similar - in and around the 10MB/sec mark. I have never seen anything approaching 40MB/sec. More like VDSL speeds on downloads.

In that case wait for a response from Ajays/jongreen84 as hopefully they will investigate further and give you a clear answer.

Edited by deleted (Thu 08-Nov-18 12:52:46)