Line is underperforming. Should be getting about 13 Meg.

In reply to a post by RobertoS:

What a pity everyone has replied here

it was too subtle, I only saw that after your comment.

In reality you can't have an average higher than the peak.

However, I don't think you are seeing the point about what the speed test is actually registering while it is hard at work. The point is that the rate recorded by the speedtest program may be higher than the actual rate achieved in practice because of the factors that the speedtest.net link identifies. It may well be that there are two consecutive chunks where the download rate is a consistent 1.8Mbps. However, because of buffering etc. only the bandwidth equivalent to a download rate of 1.4Mbps is acknowledged by the speedtest program for the first chunk. Things catch up in the next chunk so it "registers" 2.2Mbps. The 1.4Mbps may then fall into the 30% of slow chunks that are ignored while the 2.2Mbps may not fall into the 10% of fast chunks that are similarly ignored.

You will then get a skewed result and potentially even an average higher than the IP profile. It is all explained far better than I can lay it out in the link I attached to my first posting.

Sorry, I can't see how it would catch up at 2.2Mbps unless the actual speed was at least 2.2Mbps. And then given the top 10% results are discarded, the actual speed would have to be higher than 2.2Mbps anyway.

Buffering on the client machine(s) between the client modem and the program calculating the received speed is the most likely cause of speeds being recorded above the IP Profile. You probably remember how useless speedtest.net used to be when people were using Kaspersky and Avira - giving speeds double or more than the sync speed.

The reason I posted was because the particular user has McAfee and had got the same effect with it disabled.

That's assuming McAfee really does disable itself when it says it has done . Awful stuff.

Looks ok to me though

In reply to a post by LEEEVANS69:

and now today 16 th July

Download speedachieved during the test was - 37.87 Mbps
IP Profile for your line is - 41.6 Mbps

Unless I'm looking at the wrong thing

Well my reply to you was on the issue then being discussed as to how speed tests can record a higher speed than the maximum on the line - giving reasons quite independent of the sampling methods used that was being argued about.

But in reply to your latest, you didn't follow the link in the opening post of this thread .

http://forums.thinkbroadband.com/plusnet/t/4254596-p...
http://forums.thinkbroadband.com/plusnet/t/4254668-p...

he posted several, most are sensible a few have recorded speed slightly above IP profile.

Always helps to look at these things in terms of percentage errors.

AFAIK the IP profile is updated by the router being reset, so it's easy to get a profile mismatch.

The IP Profile controls the throughput speed from the MSAN/DSLAM. End of.

On 20CN it does not update immediately, remember? Only on the latest version of the WBC DLM. That can fail if the re-sync of the modem occurs before the PPP session has been dropped, as no signal is then sent to the BRAS with the new sync.

In the case of an 8Mbps sync and a 0.75kbps IP Profile, the router has clearly been reset since the 0.75kbps profile was established..