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Standard User woodyblade
(newbie) Sun 29-Jan-12 00:07:06
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Re: Attainable Rates dropped


[re: WWWombat] [link to this post]
 
Approximately 600m to the cabinet by my estimates, actual measurements by road/footpaths is about 500m so I added 100m on top to be conservative.
Though because I never saw the engineers JDSU I wouldn't be able to get an exact measurement or thickness of the cable.

Though it does really seem to match that 0.4mm measurement you quoted, on the low end at least.

EDIT: On closer looking at the links mine looks to be more like 0.5mm, because the 70mbps and more I previously saw would only be possible at 350m (more like as the crow flies distance for me) or less on 0.4mm.
Though based off the speeds my line length must have suddenly doubled for that drop to have occurred, obviously nigh on impossible.

Like I said in the first post before this drop the speeds varied between 70-85mbps, so there was reasonable variation of about 4db on SNR.

This drop was pretty sudden like a matter of a day or two at most from when I'd previously checked it, I'd been keeping an eye on it for a week or so to see the range of change and see what BT estimated.

Yeah after the suggestions previously, I was thinking more and more that crosstalk was looking like the cause, obviously being a relatively new technology to us in the UK there are unknowns, but I'm still very surprised that such a large drop would occur this quickly it doesn't bode well for everyone else if this sort of drop occurs with crosstalk.
It's looking like those within 200m-300m will be the lucky ones and everyone else will get good speeds which won't be good in 5-10 years time.

Edited by woodyblade (Sun 29-Jan-12 00:16:28)

Standard User Bald_Eagle1
(member) Sun 29-Jan-12 00:48:23
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Re: Attainable Rates dropped


[re: woodyblade] [link to this post]
 
In reply to a post by woodyblade:
I'm running Windows 7.


Update 29/01/2012:

I have now added some setting up instructions that include some screenshots to the main download zip file (hg612_wingraphs.zip):-

These instructions are named Setting_Up_Instructions.pdf

The PDF file can also be viewed/downloaded on its own at the main download site:-

Huawei HG612 Graphing Scripts


Paul.
Standard User Croftie
(member) Sun 29-Jan-12 01:15:04
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Re: Attainable Rates dropped


[re: Bald_Eagle1] [link to this post]
 
In reply to a post by Bald_Eagle1:
Just a last one, is there any noise from a quiet line test by dialing 17070 & picking option 2 and/or does your modem's GUI show any big reductions in SNRM levels while using the phone?
I had that issue for a while, SNRM dropping to as low as 1.5dB while using the phone, & causing occasional connection re-syncs (although the phone was quiet at the time).
An engineer replaced a good few metres of drop wire & that particular issue was resolved.

If I may drop in here and ask, on my line there is a 0.7 dB drop on DS and 0.1 dB drop on US, I pressume that's nothing to worry about?


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Standard User Bald_Eagle1
(member) Sun 29-Jan-12 01:25:01
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Re: Attainable Rates dropped


[re: Croftie] [link to this post]
 
I now see a slightly smaller drop than that (perhaps only 0.4dB or 0.5dB) on DS & no drop at all on US.

It doesn't appear to affect my connection anymore.
So, a good job, well done by the latest visiting engineer.

Maybe the next one will get my higher speeds back again?smile
Standard User woodyblade
(newbie) Sun 29-Jan-12 01:27:30
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Re: Attainable Rates dropped


[re: Bald_Eagle1] [link to this post]
 
Thanks Paul very handy scripts and that last bit of information to stop the CMD window appearing every minute was the last bit I needed to set the scripts up correctly.

Here's the data from 8 hours of readings.

http://imageshack.us/photo/my-images/267/linestatsp2...
Standard User Bald_Eagle1
(member) Sun 29-Jan-12 01:45:30
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Re: Attainable Rates dropped


[re: woodyblade] [link to this post]
 
Lovely Jubbly.

Your error count graphs look rather boring - sod all to report for RS Uncorrected errors smile

I wonder what might have caused the slight increase in SNRM levels at around 22:10 tonight?
Did you notice whether or not it had any effect on your attainable rates?
Those aren't currently graphed, but they are included in modem_stats.log

From my own log, the bold & underlined values are the DS & US attainable rates:-
29/01/2012 01:42 26329 5907 5.9 6.5 12.1 6.3 30344 6085


I don't know why I bothered to set the batch files up at all.
It just makes me want to cry whenever I se anyone else's good stats/graphs frown

Edited by Bald_Eagle1 (Sun 29-Jan-12 01:47:15)

Standard User woodyblade
(newbie) Sun 29-Jan-12 01:53:16
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Re: Attainable Rates dropped


[re: Bald_Eagle1] [link to this post]
 
From looking in the log it changed in the minute between 22:13-14 from "52332/20719" to "54900/21557"

xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 21591 Kbps, Downstream rate = 54900 Kbps
Path: 0, Upstream rate = 10000 Kbps, Downstream rate = 39998 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3939)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3939)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 21591 kbps 54900 kbps
Actual Aggregate Tx Power: 6.9 dBm 13.7 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 4.6 21.9 31.5 N/A 11.7 27.1 41.1
Signal Attenuation(dB): 8.5 20.8 30.1 N/A 11.7 27.1 41.1
SNR Margin(dB): 13.9 14.1 14.2 N/A 10.4 10.7 10.5
TX Power(dBm): -4.1 -24.6 6.5 N/A 11.0 8.0 6.6


Looks like a small 0.8 increase on SNR readings, so very little.
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