ADSL question

Can anyone shed any light on how my connection is performing. Im currently on LLU (Daisy) and when I download a large file it maxes out the connection according to TBB meter for 5 seconds then drops a megabit and settles there. Any ideas?

What are speedtesters saying for the connection.

The bahaviour may be nothing to do with the broadband service

Post your router stats.

In reply to a post by MrSaffron:

What are speedtesters saying for the connection.

The bahaviour may be nothing to do with the broadband service

Single threads are all over the place, multiple threads max the line for a few seconds then start to wobble. Tried two different routers and same results. Errored seconds are zero during download of files. Speedtesters are bursty as in they are fooled by the initial max download then stop when the speed is about to reduce. Heres a TBB meter grab.

http://www.flickr.com/photos/banger_this/8476717273/

This screengrab shows the initial burst of speed then drop off. A few months ago it used to max out my line downloading mutltiple threads, eg the burst seen in the screenshot would carry on for the whole file.

The only thing that has changed to my knowledge is O-bit has been taken over by Daisy and now my public IP shows as Daisy instead of O-bit.

Speedtest

http://www.thinkbroadband.com/speedtest/results.html...

Heres what the download used to be like

http://www.flickr.com/photos/banger_this/6866552037/

Edited by Banger (Sun 03-Mar-13 19:48:47)

In reply to a post by XRaySpeX:

Post your router stats.

DSP Firmware Version A2pB025f.d22k
DMT Status No Defect
Operational Mode ADSL2+
Upstream 1022
Downstream 17493
SNR Margin(Upstream) 10.9
SNR Margin(Downstream) 5.9
Line Attenuation(Upstream) 15.1
Line Attenuation(Downstream) 28.5

Suggestion is that congestion may be approaching then

Local or core? Im waiting for Daisy to give me a test login that works to try.

Heres a trace.

Tracing route to www.thinkbroadband.com [80.249.99.130]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms home.gateway.home.gateway [192.168.1.254]
2 39 ms 40 ms 40 ms hg03-gw.tn3.o-bit.net.128.107.77.in-addr.arpa [77.107.128.119]
3 39 ms 39 ms 40 ms abr01v9.tn3.o-bit.net [77.107.129.49]
4 40 ms 40 ms 40 ms 77.107.128.252
5 41 ms 40 ms 41 ms gi3-0-3.ar01.tn5.bb.gxn.net [212.241.240.161]
6 40 ms 41 ms 40 ms te2-2.cr05.tn5.bb.gxn.net [62.72.137.126]
7 57 ms 40 ms 62 ms te2-2.cr05.tn5.bb.gxn.net [62.72.137.126]
8 41 ms 40 ms 40 ms linx-gw1.thn.ncuk.net [195.66.224.240]
9 41 ms 40 ms 43 ms gi0-24-10-star1.core-rs2.thdo.ncuk.net [80.249.97.9]
10 41 ms 41 ms 40 ms www.thinkbroadband.com [80.249.99.130]

Trace complete.

Edited by Banger (Sun 03-Mar-13 21:17:38)

Could be either or if using wireless it may be variations on that

Wired only.

Heres some test results from the last month, 15 second multi thread downloads every hour.

http://www.flickr.com/photos/banger_this/8524803509/

Am I being too fussy?

Edited by Banger (Sun 03-Mar-13 21:45:43)

Further testing with good servers shows my line capable of 17.1 mbits but I cant get past about 14.1 mbits after the initial few seconds download of 17.1. Daisy is now unlimited, some sort of DLM like BT does?

DLM systmes play around with the ADSL metrics i.e. connection speed, target noise margin and interleaving. Not dynamically throttling the IP throughput every few seconds.

More likely your throughputs are really always around 14.1 Mbps, but looking at the tbbmeter there was a small gap before the 17 Meg peak, i.e. might just be a factor of how your AV suite is operating on trhe PC

Thanks Andrew but if it is AV I have tested on 3 machines with two different AVs, two XP machines with MS AV and Nod32 and a Win 8 machine with MS AV. Results are identical. The small gap at the beginning is Firefox switching from single thread download to mutiple threads to max out the connection. These results are repeatable. Single thread downloads are rubbish.

Just to round this thread off with some sort of conclusion. Vivaciti and I have agreed this appears to be exchange congestion, but there are no plans for the wholesaler to upgrade capacity at the moment especially as there is little impact on my LLU line. Will have to keep an eye on it and hope it doesnt get any worse or I will have to shift to BT 21CN and their DLM.