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Standard User truex360
(regular) Sun 24-Jun-12 10:20:36
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
engineer has been this morning. Not faults on the line or noise !. they have done a profile reset in the cab to 80/20 but he said i would have to wait 10 days for line training if this does not fix a swap around in the cab would be needed. am i right in thinking that the attainable rate should not of moved from 88/30 its now currently 46/19 and this is this issue not the sync speed

Aquiss 80/20 FTTC
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Standard User RobertoS
(sensei) Sun 24-Jun-12 10:43:59
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
Did your modem re-sync when he did that?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre 80/20 trial.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Standard User truex360
(regular) Sun 24-Jun-12 10:56:26
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: RobertoS] [link to this post]
 
they did two resyncs on the line but the attainable rate has not moved which makes me think its the cab. does the attainable rate need to retrain as well or should that be a given on the line ? no the modem and line are still operating around 45/19 just like when the issue first occured

Aquiss 80/20 FTTC
My Broadband Speed Test
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Standard User Bald_Eagle1
(committed) Sun 24-Jun-12 11:14:57
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
What are your current SNRM levels?

If they are not much higher than 6dB, they would be way too low for any higher speed (sync or attainable), suggesting a physical line problem (or a speed "cap" has been implemented for some reason).

Also, from xdslcmd info --pbParams, has there been any change in attenuation levels per DS & US band plan? (assuming you have been noting them).

Edited by Bald_Eagle1 (Sun 24-Jun-12 11:18:40)

Standard User RobertoS
(sensei) Sun 24-Jun-12 11:15:31
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
I believe the attainable rate is just a calculation made by the modem based on the attenuations/noise levels/noise margin and currrent sync. Did the sync speeds change significantly?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre 80/20 trial.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Standard User truex360
(regular) Sun 24-Jun-12 11:38:43
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: Bald_Eagle1] [link to this post]
 
[IMG]http://i713.photobucket.com/albums/ww132/truex360/li...[/IMG]

just run now after engineer visit he did test the line for all faults but they passed e.g. noise etc

Aquiss 80/20 FTTC
My Broadband Speed Test
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Standard User truex360
(regular) Sun 24-Jun-12 11:42:00
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
before issue

[IMG]http://i713.photobucket.com/albums/ww132/truex360/mo...[/IMG]

just after engineer visit today

[IMG]http://i713.photobucket.com/albums/ww132/truex360/23...[/IMG]

Aquiss 80/20 FTTC
My Broadband Speed Test
Upload is 16 smile
Standard User RobertoS
(sensei) Sun 24-Jun-12 12:58:46
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
I meant did the modem resync when the engineer fixed the profile. If it didn't, then you need to resync it yourself.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - Plusnet Value Fibre 80/20 trial.

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Standard User Bald_Eagle1
(committed) Sun 24-Jun-12 14:59:41
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: truex360] [link to this post]
 
Your SNR graph seems to have really low values compared to your Hlog (attenuation) which looks really good.

Low SNR graph values seem to suggest a noisy connection.

Even my poor connection has higher values in the SNR graph than yours.

Do you have an older SNR graph for comparison?

It COULD just be a massive change in crosstalk ???

Edited by Bald_Eagle1 (Sun 24-Jun-12 15:00:45)

Standard User truex360
(regular) Sun 24-Jun-12 16:54:15
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Re: Attainable rate has dropped from 88999 / 30000 to 46818


[re: Bald_Eagle1] [link to this post]
 
i haven't got my graphs from when i first went onto 80/20 only the modem page (above) showing full sync. The engineer was in agreement that something was wrong as the cab is just around corner he had profile reset but he did say something about a move within the cab if this did not work. the only thing i can see that has change is my neighbors had a new line installed . but would cross talk half a line ??? as my predicted speed on btw website was 67.5

Aquiss 80/20 FTTC
My Broadband Speed Test
Upload is 16 smile
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