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runner_bean
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Message 1 of 7

ADSL2+ speed reduction for no reason

After 18+ months of circa 7Mbps service from my local exchange using ADSL2+ the speed has suddenly dropped to 5Mbps without anything being changed that I am aware of.  The data below is taken from Thinkbroadband tests with the 7.4Mbps results coming after a recent Noise Margin reduction 9dB to 6dB.  Do I need to fault the line or is this situation normal?  My Home Hub 2 stats are also appended, after a reset today.  My normal sync rate is in excess of 8Mbps.

 

Any advice much appreciated.

 

ADSL line status
Connection Information
Line stateConnected
Connection time0 days, 00:15:30
Downstream5,891 Kbps
Upstream1,044 Kbps
 
ADSL Settings
VPI/VCI0/38
TypePPPoA
ModulationG.992.5 Annex A
Latency typeInterleaved
Noise margin (Down/Up)7.0 dB / 5.8 dB
Line attenuation (Down/Up)43.5 dB / 21.2 dB
Output power (Down/Up)9.6 dBm / 1.5 dBm
Loss of Framing (Local/Remote)0 / 0
Loss of Signal (Local/Remote)0 / 0
Loss of Power (Local/Remote)0 / 0
FEC Errors (Down/Up)631 / 11
CRC Errors (Down/Up)0 / 53
HEC Errors (Down/Up)0 / 0
Error Seconds (Local/Remote)0 / 6
 

 

Thinkbroadband results

Date Down TBB Down HTTPx6 Upstream IP Address ISP

Tue 15/07/14 12:40 5.03 Mbps4.99 Mbps0.89 Mbps81.157.83.126BT
Sun 13/07/14 10:57 5.01 Mbps4.98 Mbps0.89 Mbps86.128.126.215BT
Thu 10/07/14 08:46 4.58 Mbps4.55 Mbps0.89 Mbps31.49.84.70BT
Mon 23/06/14 21:25 6.99 Mbps6.91 Mbps0.86 Mbps86.161.54.86BT
Thu 19/06/14 16:46 6.80 Mbps6.77 Mbps0.86 Mbps81.157.84.243BT
Sat 24/05/14 11:36 7.41 Mbps7.36 Mbps0.88 Mbps81.159.148.69BT
Fri 23/05/14 10:11 7.42 Mbps7.39 Mbps0.88 Mbps81.159.148.69BT
Fri 28/03/14 08:34 6.53 Mbps6.42 Mbps0.90 Mbps86.128.122.83BT
Tue 18/02/14 11:50 6.66 Mbps6.54 Mbps0.89 Mbps217.42.96.156BT
Tue 11/02/14 13:41 6.62 Mbps6.51 Mbps0.89 Mbps86.144.13.66BT
Tue 24/12/13 17:00 6.83 Mbps6.67 Mbps0.90 Mbps86.157.37.247BT
Tue 03/12/13 17:07 6.50 Mbps6.37 Mbps0.85 Mbps86.143.159.100BT
Wed 20/11/13 10:53 6.51 Mbps6.43 Mbps0.87 Mbps86.156.25.69BT
Wed 20/11/13 10:51 5.28 Mbps6.36 Mbps0.87 Mbps86.156.25.69BT
Wed 06/11/13 13:22 6.29 Mbps6.16 Mbps0.88 Mbps81.151.74.138BT
Mon 21/10/13 11:53 6.59 Mbps6.43 Mbps0.88 Mbps86.161.225.223BT
Thu 29/08/13 09:48 6.42 Mbps6.29 Mbps0.89 Mbps86.143.159.2BT
Wed 21/08/13 18:02 6.41 Mbps6.30 Mbps0.90 Mbps86.143.159.2BT
Fri 02/08/13 12:24 6.91 Mbps6.78 Mbps0.89 Mbps86.150.179.69BT
Tue 23/07/13 16:07 7.39 Mbps7.26 Mbps0.90 Mbps86.161.54.179BT
Sat 13/07/13 11:17 7.11 Mbps6.98 Mbps0.89 Mbps86.149.253.201BT
Thu 11/07/13 09:02 6.98 Mbps6.98 Mbps0.89 Mbps86.149.253.201BT
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6 REPLIES 6
Distinguished Sage
641 Views
Message 2 of 7

Re: ADSL2+ speed reduction for no reason

Hi Welcome to the community forums
Here is a basic guide to getting help from the community members done by CL Keith Please read through the link posted http://forumhelp.dyndns.info/speed/first_steps.html
once you have posted the information asked for then the community members can help you more

if using a hub 4 locate these lines located in the hub logs
Lines should look like this
19:11:29, 07 Nov. (2290101.460000) DSL noise margin: 7.00 dB upstream, 6.10 dB downstream
19:11:29, 07 Nov. (2290101.390000) DSL line rate: 448 Kbps upstream, 288 Kbps downstream

Thank You
This is a customer to customer self help forum the only BT presence here are the forum moderators
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Distinguished Sage
Distinguished Sage
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Message 3 of 7

Re: ADSL2+ speed reduction for no reason

before your manual reset did you notice your connection dropping and then reconnecting?  this would cause your noise margin to increase above normal 6db with a drop in connection speed

 

you need to remain connected with no resets for 3+ days and if no change then repost your stats

 

try quiet line test  dial 17070 option 2  should be quiet and best with corded phone   if cordless then dull hum normal

 

are you conencted to the test socket especially if you have extension sockets in other rooms



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runner_bean
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Message 4 of 7

Re: ADSL2+ speed reduction for no reason

Hello imjolly and thanks for your advice.

1.  I have tried the quiet line test and just get a very gentle buzz in the background - no crackles.

2.  My HH2 is connected via a screened RJ11 cable and an ADSL faceplate splitter which is cabled straight back to my 'modern' Master socket, which has the bell wires lifted, and all other sockets in my house come off the phone side of the ADSL faceplate splitter.  All this and ADSL2+ used to give a good result given that I'm about 3km from the exchange.

3.  I had an agent from BT India connect to my PC last week and he complained of disconnections, but I have not experienced them as a frequent issue, although the HH does reset from time to time, I had presumed under exchange command.

4.  It's just odd that the sync rate is suddenly no longer aligned with my line attenuation as per the tables.  The 'ping' time has also gone up from c.20ms to c.34ms which is hard to explain!

 

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runner_bean
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Message 5 of 7

Re: ADSL2+ speed reduction for no reason

Well after about six weeks of consistently slower than normal service the sync rate has suddenly jumped back up to 8Mbps and download speeds are back to about 7Mbps.  Ping time has dropped from 34ms to its 'normal' 20ms.  All very strange as no changes have taken place in the home.  Could there have been a fault on an adjacent line causing interference which has now been cleared?  Or could exchange reconfiguration cause the changes?

 

 

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Distinguished Sage
Distinguished Sage
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Message 6 of 7

Re: ADSL2+ speed reduction for no reason

sounds like the DLM has finally reset your line after a period of stability and you are now back to where you were with 8mb conenction  as you are on adsl2+ your profile would change to correct value as soon as connection speed changed



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runner_bean
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Message 7 of 7

Re: ADSL2+ speed reduction for no reason

Thanks for the comment.  It's all quite strange because during the slow speed period the DLM tried reducing the SNR to 3dB from my usual 6dB, but with little speed improvement.  It almost like the DLM put a line speed cap on my line.  And why should that nearly double the ping time?

 

You are quite right that with ADSL2+ the line speed comes up right away - a great improvement on ADSL Max which could be infuriating.

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