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Standard User yarwell
(sensei) Tue 29-Jan-13 11:54:54
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
yes, the high target SNR margin is holding down the sync. That should rectify over a few weeks if the line is stable now. Looks like you have a target of 15. If you can't get the ISP to reset it then waiting is the only option.

--

Phil

MaxDSL - goes as fast as it can and doesn't read the line checker first.

MaxDSL diagnostics
Administrator MrSaffron
(staff) Tue 29-Jan-13 11:57:16
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
If the line is flapping around e.g. connecting at 0.2 Mbps for a few seconds and then back to 4.9Mbps - then yes you may end up with your IP profile always stuck at a low value.

This is why one poster is saying you need to sort out your line issue.

Though if memory is working you did show an uptime of over 24 hours at some point in this thread.

Andrew Ferguson, [email protected]
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User matthewcl375
(newbie) Tue 29-Jan-13 12:01:54
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: MrSaffron] [link to this post]
 
The line speed (sync speed) is perfectly stable, now at 4960Kbps after a daylight hours reboot. The only time it changes is if i manually reboot the router.

My understanding was that it goes SNR Margin -> Sync Speed -> IP Profile -> Throughput, so Im not sure how it came to be that the Sync Speed is 4960 but the SNR Margin is so high?


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Standard User huwwatkins
(member) Tue 29-Jan-13 12:12:41
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
You should be getting maximum sync of 8128 or 7616 considering your line attenuation. Your SNR is high (should be 6db) which is suppressing your sync rate - this could be indicative of a line fault or just a consequence of your previous line drop outs before the cable was replaced.

Might be worth asking your ISP to reset the target margin in case its a hang over from your previous issues.

Edited by huwwatkins (Tue 29-Jan-13 12:15:03)

Administrator MrSaffron
(staff) Tue 29-Jan-13 12:21:11
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
First one in your list is really Target SNR margin.

The target seems set to 15dB, starts at 6dB when line is first activated and the automatic system over weeks or months if they detect instability rise the target in steps of 3dB until a speed that is more stable is found.

The interference is that your line has burst of noise some 10dB or bigger in size, or did in the past and setting a 15 target means the modem can hang onto the service.

Andrew Ferguson, [email protected]
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User XRaySpeX
(eat-sleep-adslguide) Tue 29-Jan-13 12:30:25
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
In reply to a post by matthewcl375:
so Im not sure how it came to be that the Sync Speed is 4960 but the SNR Margin is so high?
The NM is so high, mainly but entirely, cuz your line is so short that it would have plenty of spare bandwidth were it not forced down by G.DMT, which you are compelled to use. The other contributor to the high NM must be faulty wiring as, for the same reason, you should be syncing at 8128 K..

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Standard User matthewcl375
(newbie) Tue 29-Jan-13 12:58:22
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: MrSaffron] [link to this post]
 
It's true that my line did have loads of noise, that is why we had to replace the phone line to the street outside, but now that issue has completely gone, it needs to be reset I am thinking?

@HuwWatkins Yes, it should be a lot higher, also considering that this is a brand new phone line, before we were getting up to 8-900 Kilobytes Per Second

Edited by matthewcl375 (Tue 29-Jan-13 13:02:15)

Standard User XRaySpeX
(eat-sleep-adslguide) Tue 29-Jan-13 13:22:52
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
In reply to a post by matthewcl375:
before we were getting up to 8-900 Kilobytes Per Second
Kilobits per sec, written as kbps.

1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Standard User matthewcl375
(newbie) Tue 29-Jan-13 13:24:47
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
UPDATE:

Tesco just called, put me straight through to someone who knew what they were talking about (makes a change) who got me to run BTW Speed test and send results to him. They're going to get their network team to run a check using BT Open reach's system and then take it from there.

He agreed with what you all have been saying, that it's the noise from before the new line was installed which is keeping me syncing so low, and Tesco are happy to request a reset of my IP Profile (I guess that includes noise margin) if it is needed!

Tesco are going to get back to us within 48 hours about this. Now there's customer service

Edited by matthewcl375 (Tue 29-Jan-13 13:25:42)

Administrator MrSaffron
(staff) Tue 29-Jan-13 13:28:33
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Re: Slow internet/low IP profile/high noise margin on Tesco


[re: matthewcl375] [link to this post]
 
A reset of IP profile is independent of the noise margin.
If they had said a reset of the DLM to let the line learn the optimum settings, then that would have covered both.

Key phrase that BT Wholesale understand is 'reset the target noise margin to default 6dB to allow the line to train', a fairly common request after some infrastructure work on a line.

The data on the line and its performance both current and historical should be visible to the ISP, but often providers don't push this information to the people you can talk to.

Andrew Ferguson, [email protected]
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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