Migration complete!

[Rik]

Rik if Simon has had a low sync even on his migration would that possibly re-start his training period

It shouldn't do, Gary. OTOH, it can cause the profile to drop. Visits by ADSL engineers often have the same effect as, every time they change something, it appears to the DLM software like a re-sync.

having done to much reading for my own good some ISP's suggest this can happen when you are swapped over with loss or sync events and for my own clarification does IDNet do this

Afaik, an ISP has to specifically request that a training period is re-started, either on migration or at some other time. It's not normally done without a reason. I know that I did not re-train on my own migration.

[Rik]

How do we get the line retrained?

Give support a ring, Simon, but first make sure everything is fine at your end in terms of MTU/RWIN settings and wiring. Your throughput is lower than it should be for your profile, so that needs to be resolved before you start a re-train. If the issue is exchange congestion, then a re-train would not help.

[Gary]

How do we get the line retrained?

Do all that Rik has suggested about your RWIN & MTU Simon, also make sure you check your wiring from the BT master socket, things like power cables, cheap filters and using poorly shielded cable to your router can all make a huge difference, I use a filtered face plate from Adsl nation http://www.broadbandbuyer.co.uk/Shop/ShopDetail.asp?ProductID=3306
you can use this if you have a BT NTE5 Master socket, try to use cat 5 cable if you have it as well, and don't have lightning protectors on the line either they produce more noise than protection you could also try unplugging your router for 30mins although Rik or Lance will know a faster way to do this by changing the DNS address briefly, once you have your side in order and you know its all ok do as Rik suggested and contact Support.

[Gary]

Simon the trick instead of pulling your routers power is change your username to speedtest@speedtest_domain that usually does the trick it appears as it forces a refresh at the radius servers. Hope all this helps you to get up to speed in no time 

[Simon]

Thanks guys, looks like a busy evening for me!

[Simon]

My hunch, Simon, is that you've had a low sync event along the way, as your noise margin is high. That said, for your profile, you're not getting the throughput I would expect. What settings are you using for RWIN & MTU?

Here are my RWIN & MTU settings:

[Simon]

I did the logging into speedtest@speedtest_domain thing, and my noise margin seems to have decreased:

ADSL Link               Downstream     Upstream
Connection Speed   4672 kbps        448 kbps
Line Attenuation     34 db               9.5 db
Noise Margin           4 db                20 db

[Simon]

...and the BT speedtest results:

IP profile for your line is - 4000 kbps
DSL connection rate: 448 kbps(UP-STREAM)  4672 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 2748 kbps

[Lance]

I think I would try upping the MTU to 1500 and then adjust the RWIN accordingly. To me that looks the reason for your low throughput.

[Simon]

I honestly haven't got a clue about MTU and RWIN, Lance.  What should my RWIN be if I up the MTU to 1500? 

[Lance]

If you download TCP optimiser from here http://www.speedguide.net/downloads.php it should automatically detect the best MTU & RWIN for your line. Just make sure you have the correct network adapter selected in the program prior to making changes.

[Simon]

OK, I must be being really thick, but I've somehow made it worse!

IP profile for your line is - 4000 kbps
DSL connection rate: 448 kbps(UP-STREAM)  4512 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 1876 kbps

With that TCP Optimiser, what speed should I adjust the slider to? 

[Lance]

I would set it to 4000 to match your profile. What have the figures changed to?

[Simon]

As above, Lance. 

[Lance]

So your MTU and RWIN haven't changed?

[Simon]

Sorry Lance, misunderstood.  I have now reverted back to the settings I posted originally, but my profile has now dropped, as has the throughput.  I'm beginning to wish I'd left things as they were. 

IP profile for your line is - 3500 kbps
DSL connection rate: 448 kbps(UP-STREAM)  4256 kbps(DOWN-STREAM)
Actual IP throughput achieved during the test was - 1581 kbps

[MoHux]

I honestly haven't got a clue about MTU and RWIN, Lance.  What should my RWIN be if I up the MTU to 1500? 

Either 134320 or 268640 Simon.

If you use DRTCP to change it, don't forget to restart the computer after saving, or it loses the settings.

All that assumes you are using XP.  In Vista, Windows takes care of RWin and MTU dynamically for the computer.  Just make sure the router lets all packet sizes through, by setting it's  MTU to the max' 1500.
 

[Simon]

Thanks Mo, but seeing as every other setting seems to make things worse, I have now reverted to default Windows settings, however, I still can't achieve the 4000 kbps profile that I had before I started fiddling.

[MoHux]

Thanks Mo, but seeing as every other setting seems to make things worse, I have now reverted to default Windows settings, however, I still can't achieve the 4000 kbps profile that I had before I started fiddling.

C'mon Si' where's yer sense of adventure!?   

[Lance]

The profile is unaffected by any of the settings you have changed. The reason it has dropped is because your sync has dropped lower. This is because of noise on your line, have you tried removing your ring wire? I can't remember!

I wonder if throughput is low because of congestion at your exchange.

[Simon]

The profile is unaffected by any of the settings you have changed. The reason it has dropped is because your sync has dropped lower. This is because of noise on your line, have you tried removing your ring wire? I can't remember!

I wonder if throughput is low because of congestion at your exchange.

Ring wire??    Too technical for me, Lance.  Pushing buttons is fine, but as far as 'hands on' stuff goes, it's as much as I can do to wire a plug. 

All I can definitely say is that since I changed the settings, I haven't achieved anywhere near the speed I was getting before changing the settings, and even when I restored them to how it was, I'm still getting lower readings.

[Simon]

C'mon Si' where's yer sense of adventure!?   

I left it with Pipex, Mo! 

[Lance]

Have a read of the faq, simon, about internal wiring. Removing the ring wire is even easier than wiring a plug!

[Gary]

At this time of night Simon you will have more potential for noise on your line, lstreet lighting even temperature can effect cable runs, I would suggest tomorrow you unplug your router for 30 mins maybe late morning and leave it off for 30mins maybe slightly over then power your router back up (do this with your pc off as there is not much point having it on with no line connection) then leave it over the weekend to see what your line stats do. Can I ask what security software you use? and do you use p2p software? I'm wondering like lance if you have a congested exchange but wanted to know if you have anything running that would be using up bandwidth when you ran your test 

[Gary]

Have a read of the faq, simon, about internal wiring. Removing the ring wire is even easier than wiring a plug!

It is quite easy Simon and can make a big difference to noise as Lance says http://yarwell.blogspot.com/2005/08/adsl-tweaking.html