Comments on: Broadband Speed Faults: How to diagnose? http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/ News and Updates on the Community. Fri, 06 Nov 2009 18:54:21 +0000 http://wordpress.org/?v=2.8.4 hourly 1 By: James http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-16228 James Tue, 29 Sep 2009 13:04:22 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-16228 One way I discovered to reduce noise on the line is to remove the bell wire - it's not needed and will actually slow down your broadband see... http://broadband-speedup.blogspot.com/ One way I discovered to reduce noise on the line is to remove the bell wire - it's not needed and will actually slow down your broadband see... http://broadband-speedup.blogspot.com/

]]> By: joan http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-16117 joan Sun, 20 Sep 2009 11:37:01 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-16117 on Broadband since 8th Sept. Phone not yet. Speeds - download 130 kbts. Streaming 1 from 85 - 87 Streaming 2- 142 - 143 Streaming 3- 0 - 79. what I am paying for? I have had connections checked etc. on Broadband since 8th Sept. Phone not yet. Speeds - download 130 kbts. Streaming 1 from 85 - 87 Streaming 2- 142 - 143 Streaming 3- 0 - 79. what I am paying for?
I have had connections checked etc.

]]> By: James http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-15495 James Mon, 17 Aug 2009 13:21:18 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-15495 Hi Steven, Thanks for your comment - I think if I tried covering everything the article would probably have never ended and it was a touch on the verbose side to start with! To answer your questions: 1 - The DLM will downgrade the speeds (ie the IP Profile) based on the speed of resynchronisation events, so yes. 2 - I believe (and this is certainly thw case on the ADSL2+ product) that it is more than one disconnection within the space of 15 minutes. 3 - If there are multiple disconnections, then yes this can, and does occur (quite commonly). 4 - It's generally done in 3dB increments and you're normally looking at a decrease of about 800Kbps in sync speed per 3dB increase in SNR. 5 - Hah - With some difficulty. It involves raising a fault to BT who are generally only happy to reamend the "target SNR" if they are happy that the fault has been rectified. 6 - There would be no reduction in criteria. Again, this is all determined on the synchronisation speed. 7 - Unfortunately not. It's designed to ensure that a "stable" internet connection is maintained and we have no way of bypassing the DLM. 8 - It can be, but it's unlikely to be beneficial. Hope this helps to clear things up a bit. James Hi Steven,

Thanks for your comment - I think if I tried covering everything the article would probably have never ended and it was a touch on the verbose side to start with!

To answer your questions:

1 - The DLM will downgrade the speeds (ie the IP Profile) based on the speed of resynchronisation events, so yes.
2 - I believe (and this is certainly thw case on the ADSL2+ product) that it is more than one disconnection within the space of 15 minutes.
3 - If there are multiple disconnections, then yes this can, and does occur (quite commonly).
4 - It's generally done in 3dB increments and you're normally looking at a decrease of about 800Kbps in sync speed per 3dB increase in SNR.
5 - Hah - With some difficulty. It involves raising a fault to BT who are generally only happy to reamend the "target SNR" if they are happy that the fault has been rectified.
6 - There would be no reduction in criteria. Again, this is all determined on the synchronisation speed.
7 - Unfortunately not. It's designed to ensure that a "stable" internet connection is maintained and we have no way of bypassing the DLM.
8 - It can be, but it's unlikely to be beneficial.

Hope this helps to clear things up a bit.

James

]]> By: stevenb http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-15415 stevenb Wed, 12 Aug 2009 20:31:20 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-15415 James Great article as far as it goes, but can you explain a bit more about the BT DLM that seems to have taken control of my service! In particular :- 1. Does the DLM look for loss of synch/router disconnection prior to dowmgrading the downstream service? 2. If so how many disconnections in what time period cause the DLM to intervene and downgrade the service profile? 3. Does the DML downgrade service by increasing the suggested operational noise margin for the router and reducing the line profile? 4. If so by how much is the noise margin increased and how much is the dowmstream speed reduced? 5. if the service is downgraded (reduced line profile) assuming no actual fault, how can it be improved and how long does this take? 6. If 2 applies are the criteria reduced or maintained before a further reduction in downstream speed is made? 7. Can this automatic process be disabled. When the service was apparently failing to perform (through multiple disconnections) I experienced no problems and would not have complained about apparent disconnections? 8. Since no one told me I should not turn my router off, can the initial 10 day test period be re-started? Hoping for some clarification on what's been happening. Kind regards Steve James
Great article as far as it goes, but can you explain a bit more about the BT DLM that seems to have taken control of my service!
In particular :-
1. Does the DLM look for loss of synch/router disconnection prior to dowmgrading the downstream service?
2. If so how many disconnections in what time period cause the DLM to intervene and downgrade the service profile?
3. Does the DML downgrade service by increasing the suggested operational noise margin for the router and reducing the line profile?
4. If so by how much is the noise margin increased and how much is the dowmstream speed reduced?
5. if the service is downgraded (reduced line profile) assuming no actual fault, how can it be improved and how long does this take?
6. If 2 applies are the criteria reduced or maintained before a further reduction in downstream speed is made?
7. Can this automatic process be disabled. When the service was apparently failing to perform (through multiple disconnections) I experienced no problems and would not have complained about apparent disconnections?
8. Since no one told me I should not turn my router off, can the initial 10 day test period be re-started?

Hoping for some clarification on what's been happening.

Kind regards

Steve

]]> By: LEE http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-15127 LEE Sun, 26 Jul 2009 11:53:47 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-15127 Why is my line only 1.5mb when I have 8mb broadband, it states that my exchange i should get 4mb which would be kind of good but not what i'm paying for. But for it to be only 1.5mb is lousy. You need to talk to BT or you guys turn the tap on more. Why is my line only 1.5mb when I have 8mb broadband, it states that my exchange i should get 4mb which would be kind of good but not what i'm paying for. But for it to be only 1.5mb is lousy.
You need to talk to BT or you guys turn the tap on more.

]]> By: Help! Really..........slow..........broadband - Page 2 - YD Scuba Diving Forums http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-14421 Help! Really..........slow..........broadband - Page 2 - YD Scuba Diving Forums Wed, 17 Jun 2009 13:20:26 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-14421 [...] these links PlusNet [...] these links PlusNet

]]> By: Blogging about Blogging | Community Site News http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-13550 Blogging about Blogging | Community Site News Wed, 29 Apr 2009 13:31:59 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-13550 [...] – I’ve made a few blog posts on this very website, about speeds on IPStream Max, the way our IVR works, and so on, but I’ve never really been inclined to keep my own one until [...] [...] – I’ve made a few blog posts on this very website, about speeds on IPStream Max, the way our IVR works, and so on, but I’ve never really been inclined to keep my own one until [...]

]]> By: James http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-12677 James Fri, 06 Mar 2009 12:08:24 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-12677 @ Colintivy I've replied to your forum post regarding this matter. Hopefully things are looking a bit better. @ Colintivy

I've replied to your forum post regarding this matter. Hopefully things are looking a bit better.

]]> By: colintivy http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-12659 colintivy Thu, 05 Mar 2009 17:18:10 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-12659 Hi Chris, Finally beat the bt Test into action! It reports:- down speed 3648Kbps up speed 448Kbps IP profile 500Kbps Actual IP throughput 406 Kps Mybroadband presently gives:- down 478Kbps up 375Kbps Is a clue that BT limits me to 500Kbps, presumably after Dec ?? colintivy Hi Chris,

Finally beat the bt Test into action! It reports:-
down speed 3648Kbps
up speed 448Kbps
IP profile 500Kbps
Actual IP throughput 406 Kps
Mybroadband presently gives:-
down 478Kbps
up 375Kbps

Is a clue that BT limits me to 500Kbps, presumably after Dec ??

colintivy

]]> By: colintivy http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/comment-page-1/#comment-12615 colintivy Tue, 03 Mar 2009 15:02:11 +0000 http://community.plus.net/blog/2007/07/02/broadband-speed-faults-how-to-diagnose/#comment-12615 Hi Chris, Thanks for that. I tried the BT Test but got bogged down by not giving them the login details that they expected. It looked as though they wanted a email address but perhaps I got it wrong and they wanted another one. It was the similarity between what I now get and those by Dr. Mahapatra's figure that triggerwed me off. I might add that Kelly is looking at a malfunction that I have with an apparent disconnection between the Begin button on My Broadband Speedtester panel and the running of the test. I get over this by typing in the speedtester suffix to the URL. colintivy. Hi Chris,

Thanks for that. I tried the BT Test but got bogged down by not giving them the login details that they expected. It looked as though they wanted a email address but perhaps I got it wrong and they wanted another one. It was the similarity between what I now get and those by Dr. Mahapatra's figure that triggerwed me off. I might add that Kelly is looking at a malfunction that I have with an apparent disconnection between the Begin button on My Broadband Speedtester panel and the running of the test. I get over this by typing in the speedtester suffix to the URL.

colintivy.

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