ISP traffic management ? Do you see this on other TT fibre results ?
Is there any chance the OP can test at different times of day showing us the graphs with the different results in it?
I have two theories:
The first being that your circuit is set so that one thread is equal to your IPv4 TBB speed so it will be impossible to max out the connection with one thread. Speedtest.net uses two threads (four threads sometimes if needed) hence the higher (double) speed with their tests.
The second is that TalkTalk are using traffic management as previously suggested. Completing tests at different times of the day should rule this out.
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Downstream Upstream
Connection Speed: 22494 kbps 1211 kbps
Line Attenuation: 16.0 db 9.7 db
Noise Margin: 2.6 db 6.7 db
Telewest (2004-2006): 256Kbps -> 512Kbps
BT (2006 - Present): 8128/448Kbps on 20CN Alcatel DSLAM -> 22494/1211Kbps on 21CN Huawei MSAN
Edited by chris6273 (Fri 22-Mar-13 01:19:38)