ADSL line giving very low throughput after upgrade (beyond stabilising period)

After upgrading a customer's ADSL connection from 512Kbps to 8Mbps, the throughput of the connection has dropped to around 100Kbps.

NOTE this is NOT the initial stabilising period - the line was upgraded 6 weeks ago.

The router is consistently syncing around 5Mbps, but I can only achieve around 100Kbps download speeds.  I've tried different ADSL modems (which have been tested at other locations - D-Link, Netgear, 3Com and a few other Conexant ones), but no difference.

Everything else is unplugged for the tests - just laptop, ADSL modem, wall socket...and no, nothing wrong with the laptop...no spyware or viruses that are swamping the bandwidth.

BT have sent an engineer round on 3 occassions.  Each time they plug in their equipment and report there's no problem.  On one occassion after they left the line did speed up to around 4Mbps, but then next day is was back to 100Kbps.

As far as BT is concerned, there is no problem between the site and the exchange.  And the broadband supplier says there's nothing wrong at their end.

What can I try next?
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devon-ladAsked:
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IanThCommented:
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IanThCommented:
weel another thing is it all downloads or specific ones as the speed is determined by the server
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devon-ladAuthor Commented:
I've tried 4 different speedtest websites

speedtester.bt.com
resources.zdnet.co.uk/speedtest/
www.bandwidthplace.com/speedtest
www.thinkbroadband.com/speedtest.html

I've tried them at 3 different sites where there are no broadband issues - all report correct speed.  2 of these sites use the same supplier as the problem site.

I've then tried them at the customer site - all show between 80Kbps to 130Kbps
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giltjrCommented:
You may want to try http://netspeed.stanford.edu

You can look near the bottom of the page to see if there is a location closer to you, but  this gives you a bit more detail as to any issues it may find.

You can also try:

   http://www.speedguide.net/analyzer.php

Shows you what some of your settings are.

Check the duplex on the SDSL modem and what ever connects to it.  Both sides need to be the same and full duplex is best.
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devon-ladAuthor Commented:
Thanks for both your comments.

After 6 weeks and 3 of their engineers telling us there is no problem with the line, BT now tell us there is a fault at the local telephone exchange.

This is likely to be the cause of the problems.

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Sylpheed777Commented:
Could it be a bad telephone wire? Sometimes the wire has too much interference in them as such it needs to be changed. Happens pretty often where i stay
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devon-ladAuthor Commented:
BT have confirmed that there was a problem at the local telephone exchange.  Throughput has been a steady 4Mbps over the last week.

So I wasn't going mad after all.

Thanks for all the input.

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giltjrCommented:
Thats great.
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devon-ladAuthor Commented:
How do I close this then?

Any suggestions?
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giltjrCommented:
I would suggest closing with points refunded.  You basically solved the problem yourself.

http://www.experts-exchange.com/help.jsp#hi70
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giltjrCommented:
No objections from me.
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