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Standard User Loading
(learned) Sat 19-Oct-13 14:51:21
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Slow Broadband


[link to this post]
 
Statistics -- xDSL
Bonding Line Selection:
Mode: ADSL_G.dmt
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 66 130
Attenuation (0.1 dB): 635 315
Output Power (0.1 dBm): 164 123
Attainable Rate (Kbps): 1440 756

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 1408 448 0 0

K (number of bytes in DMT frame): 55 15 0 0
R (number of check bytes in RS code word): 16 4 0 0
S (RS code word size in DMT frame): 4.00 4.00 0.0 0.0
D (interleaver depth): 8 8 0 0
Delay (msec): 8.00 8.00 0.0 0.0
INP (DMT symbol): 0.27 0.21 0.0 0.0

Super Frames: 74044 74044 0 0
Super Frame Errors: 5 4 0 0
RS Words: 216623 214302 0 0
RS Correctable Errors: 25 37 0 0
RS Uncorrectable Errors: 1 0 0 0

HEC Errors: 1511 413 0 0
OCD Errors: 2 0 0 0
LCD Errors: 2 0 0 0
Total Cells: 882636 0 0 0
Data Cells: 159618 0 0 0
Bit Errors: 0 0 0 0

Total ES: 13 0
Total SES: 0 0
Total UAS: 8 8

this is when the connection is Ok but slow the upstream noisemargin is at 13.0db



Statistics -- xDSL
Bonding Line Selection:
Mode: ADSL_G.dmt
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 66 70
Attenuation (0.1 dB): 635 315
Output Power (0.1 dBm): 164 123
Attainable Rate (Kbps): 1440 576

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 1408 448 0 0

K (number of bytes in DMT frame): 55 15 0 0
R (number of check bytes in RS code word): 16 4 0 0
S (RS code word size in DMT frame): 4.00 4.00 0.0 0.0
D (interleaver depth): 8 8 0 0
Delay (msec): 8.00 8.00 0.0 0.0
INP (DMT symbol): 0.27 0.21 0.0 0.0

Super Frames: 74044 74044 0 0
Super Frame Errors: 765 455 0 0
RS Words: 216623 214302 0 0
RS Correctable Errors: 2507 37 0 0
RS Uncorrectable Errors: 159 0 0 0

HEC Errors: 1511 413 0 0
OCD Errors: 2 0 0 0
LCD Errors: 2 0 0 0
Total Cells: 882636 0 0 0
Data Cells: 159618 0 0 0
Bit Errors: 0 0 0 0

Total ES: 103 0
Total SES: 11 0
Total UAS: 8 8

when i resync the router whilst calling the home phone, just letting it ring the noise margin halves?, also shouldn't the output power downstream be higher?
the line was tested last week and everything was normal, so there must be a fault in the exchange? after the tie pair mod?
Standard User yarwell
(sensei) Mon 21-Oct-13 14:43:45
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Re: Slow Broadband


[re: Loading] [link to this post]
 
the upstream noise margin is high because the product is capped at 448k upstream, the line capability is at least 50% higher.

downstream power is low due to line length and fewer useable tones - each tone has a certain amount of power so fewer in use = less power

--

Phil

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

MaxDSL diagnostics
Standard User XRaySpeX
(eat-sleep-adslguide) Mon 21-Oct-13 17:00:03
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Re: Slow Broadband


[re: Loading] [link to this post]
 
The Attainable Rate: is just theoretical. Just go by the plain Rate: which in these 2 cases are identical.

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 20 Meg WBC


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Standard User Ignitionnet
(knowledge is power) Mon 21-Oct-13 17:22:30
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Re: Slow Broadband


[re: Loading] [link to this post]
 
I have a similar issue and am on a very long line also.

Had the line tested to death and no issue isolated, so good luck and hope you can get it resolved.
Standard User Loading
(learned) Mon 21-Oct-13 17:48:40
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Re: Slow Broadband


[re: Ignitionnet] [link to this post]
 
Going to request a lift and shift to try and sort the problem.
Standard User Ignitionnet
(knowledge is power) Mon 21-Oct-13 20:33:10
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Re: Slow Broadband


[re: Loading] [link to this post]
 
Had one of those and it failed to clear the issue here. Hope it works for you, Sir.
Standard User Loading
(regular) Mon 21-Oct-13 21:24:03
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Re: Slow Broadband


[re: Ignitionnet] [link to this post]
 
What was your exact problem?
Standard User Ignitionnet
(knowledge is power) Tue 22-Oct-13 08:53:48
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Re: Slow Broadband


[re: Loading] [link to this post]
 
Slow upstream speeds, SNR drops when phone is taken off the hook and line drops out when the phone is put back on the hook.

This was there since a migration from LLU to BT Wholesale, along with downstream stability issues which went away on their own.

No idea what the actual issue is, 3 BT engineers weren't able to find it and a lift and shift didn't fix it, so I'm stuck with a low upstream speed so that it can survive the phone being used along with other bursts of noise.

Before the resident geniuses pop up to suggest I look at my home wiring / microfilters / etc do note that this issue is on the upstream path hence noise issues are likely to be close to the exchange where the signal from my CPE is weakest, and this issue was replicated more than once at test socket by myself with different CPE and Openreach engineers with their own kit.
Standard User 4M2
(knowledge is power) Tue 22-Oct-13 11:09:58
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Re: Slow Broadband


[re: Ignitionnet] [link to this post]
 
I had the opposite problem with ADSL MAX and partial LLU: phone was causing problems with ADSL MAX but when I switched to partial LLU the problem went away - obviously there was an issue of some sort at the exchange which Openreach (and Plusnet) didn't seem able or willing to fix in a reasonable time scale so I switched to uno TTB partial LLU.

I only had the one SFI visit and he traced the problem to the exchange but unfortunately, on that day, he was unable to fix the fault... frown
Standard User Ignitionnet
(knowledge is power) Tue 22-Oct-13 16:01:52
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Re: Slow Broadband


[re: 4M2] [link to this post]
 
In reply to a post by 4M2:
I only had the one SFI visit and he traced the problem to the exchange but unfortunately, on that day, he was unable to fix the fault... frown


2 SFIs and a Boost visit couldn't isolate the issue here frown
Standard User Loading
(regular) Tue 22-Oct-13 17:53:04
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Re: Slow Broadband


[re: Ignitionnet] [link to this post]
 
My connection isn't like that so much it is more lower noise margin (both upstream and downstream by about 8db). all of the time and attenuation increase after the tie pair mod
Standard User yarwell
(sensei) Wed 23-Oct-13 11:14:41
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Re: Slow Broadband


[re: Ignitionnet] [link to this post]
 
do note that this issue is on the upstream path hence noise issues are likely to be close to the exchange
or just in the relevant frequency band regardless of location.

--

Phil

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

MaxDSL diagnostics
Standard User Loading
(regular) Wed 23-Oct-13 17:23:46
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Re: Slow Broadband


[re: yarwell] [link to this post]
 
Line is making a clicking noise in 3s (click,click,click, then a pause, then it starts again.
Standard User Ignitionnet
(knowledge is power) Wed 23-Oct-13 21:25:42
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Re: Slow Broadband


[re: yarwell] [link to this post]
 
Thank you for the lesson in elementary physics.
Standard User Ignitionnet
(knowledge is power) Thu 24-Oct-13 14:31:35
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Re: Slow Broadband


[re: yarwell] [link to this post]
 
Okay to be fair I should really have updated this a bit more.

The noise is broadband - it affects multiple bins on the upstream path and affects the downstream slightly too, but to a far lesser extent than the upstream.

Affected downstream bins manage 5+ bits / bin. SNR on them is considerably higher than the SNR on the upstream bins affected.

All this implies to me that the noise / issue is likely sourced from near the exchange, which is far from impossible given the placement of the exchange - an industrial estate.

In any case it's academic. This is in the 'can't fix' section for Openreach and will be resolved once FTTC is in place.

Currently struggling with a 120kbps upstream barely holding on. Not great.
Standard User Loading
(regular) Thu 24-Oct-13 20:22:11
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Re: Slow Broadband


[re: Loading] [link to this post]
 
In reply to a post by Loading:
Line is making a clicking noise in 3s (click,click,click, then a pause, then it starts again.
anyone, although this is intermittent
Standard User yarwell
(sensei) Fri 25-Oct-13 16:42:49
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Re: Slow Broadband


[re: Ignitionnet] [link to this post]
 
In reply to a post by Ignitionnet:
Thank you for the lesson in elementary physics.


you're welcome. It should avoid people thinking upstream problems only occur at the exchange, when you can have household problems limiting the upstream quite badly.

--

Phil

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

MaxDSL diagnostics
Standard User yarwell
(sensei) Fri 25-Oct-13 16:45:55
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Re: Slow Broadband


[re: Loading] [link to this post]
 
electric fence is the only thing that springs to mind with a low frequency regular pattern. Wind can move overhead lines and do similar things but it would be variable.

You may do betting in the General Broadband Chatter section as this isn't really a notspot issue per se.

--

Phil

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

MaxDSL diagnostics

Edited by yarwell (Fri 25-Oct-13 16:47:00)

Standard User Loading
(regular) Fri 25-Oct-13 20:53:44
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Re: Slow Broadband


[re: yarwell] [link to this post]
 
It is only intermittent as it can be when the phone is ringing out, it may start to click but then stop, other times there will be no clicking just a hissing noise
Standard User Loading
(regular) Mon 28-Oct-13 09:29:06
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Re: Slow Broadband


[re: yarwell] [link to this post]
 
Bt have now just reset the snr from 16.0db and have said that there is nothing wrong with the line, but there is clearly as there is a hiss and the attenuation has increased with hundreds of thousands of errors at 6.0db noise margin.
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