Line Stats Analysis Results

Expert

Line Stats Analysis Results

This thread will contain the results of the analysis of everyone's line stats that have been posted in the Data/Stats Collection Thread.

 

My initial analysis is not focused so much on distance from the VRAD.  The reason for this is that not too many people have distances that have been told to them by a tech using their specialized meters.  Furthermore, different line conditions can cause inaccuracy in their measured distances.

 

As it turns out, distance from the VRAD isn't the most important thing regarding the type and quality of service that you get anyway.  Instead, the wiring gauge, presence/absence of bridge taps, and the noise margin (signal-to-noise ratio) of the line are much more important.

 

To this end, the data that has been posted in the Data/Stats Collection Thread led to a rock-solid and extremely useful correlation that can be used to immediately judge the quality of your line and the service you can receive.  That correlation is the Downstream Noise Margin and the Max Line Rate.

 

Using only these two parameters, you can tell if A) Your line is working properly (i.e.. no bridge taps), B) What gauge wire is running from the VRAD to your NID, and C) What line profile you should be able to get.

 

Please note that I arrived at the wire gauge conclusions here because there are two distinct groupings of data points.  I am assuming the difference between them is due to wire gauge, because A) It is known that different neighborhoods around the country use two different wire gauges, 22 gauge, and 24 gauge, B) Thinner wire (24 gauge) would have higher attenuation in the high frequencies, which would reduce the max line rate for a given signal-to-noise ratio, which is exactly what the graph shows.  It is possible that the two groupings of data are due to a different cause, but until I either gather more data or have references to other possible conclusions, I'm going to assume the difference is due to wire gauge even though I cannot currently prove that with certainty.

 

There is a 3rd grouping of data that shows some people with a drastically reduced max line rate.  I'm fairly certain these people have a bridge tap on their line that is reducing the max line rate.  If their line was conditioned by I&R to remove the bridge tap, their max line rate would jump up into one of the other two groupings.  I have witnessed this first-hand, as my initial installation was on a line that had a bridge tap.  When the bridge tap was removed, the max line rate shot up by over 15000 Kbps.  I unfortunately cannot compare the numbers that I had at that point to the numbers I have now because those older numbers were using the VDSL1 protocol and at least 2 revisions earlier of the RG firmware.  Those values cannot be reliably compared to today's values obtained with the VDSL2 protocol and the current RG firmware revision (5.29.135.47).

 

Here's the first fully analyzed chart:

 

 

 

 

 

You can plainly see how well the data groups are formed here.  There are two distinct lines of people with properly working service, and a 3rd line of people with service that is probably not running right.  In addition, you can see the very rare people who are so close to the VRAD that they are currently being capped to a maximum line rate of 64000 Kbps.

 

For those of you who have some background in statistics, the linear correlation coefficients (R^2) for each of the 3 trend lines on the chart was > 0.98.  (This means that the computed lines fit the actual data very nicely).

 

The allowable line profile areas were computed by assuming that a line capacity of 80% is required for properly working service.  Line capacity = downstream profile rate / max line rate.  For example, for a properly working 32/5 profile, the downstream profile rate is 32200 Kbps.  FOr a line capacity of 80%, that means that Max Line Rate = Downstream Profile Rate / 80% = 32200 / .8 =  40250 Kbps, which I rounded to 40000.  The other rates separating the profiles were computed similarly.  The exception is the border for No Service, where I upped the allowed line capacity to 85% to allow just a little less max line rate.

 

The people whom I believe have a bridge tap on their line are very interesting.  The bridge tap reduces the max line rate that the line could theoretically carry by nearly 30%.  In the particular case of the person with an 18.5 dBm noise margin and 29000 Kbps max rate, having the line conditioned could conceivably get him a max line rate of 41000 Kbps, which would boost his allowable profile from 19/2 to 32/5 !  He could conceivable go from 1HD/3SD to 3HD/1SD just by having the bridge tap removed.

 

The person with the 10.0 dBm noise margin and a 19200 Kbps max rate is certainly experiencing poor service.  The line capacity in his case is at 100%, with no margin for errors.

 

 

In short, this chart can tell you at a glance whether your service is operating in agreement with everyone else's service.  It can immediately identify what profile you should be on or be able to get.  It can tell you if your line needs conditioning to have a bridge tap removed.  Based on my assumptions, it can also tell you your wire gauge, although that parameter is questionable.

 

When people post their line stats, this chart can be very useful in quickly determining if they are experiencing line problems or if their service is in agreement with normally working service.

 

Message 1 of 283 (8,775 Views)
ACE - Expert

Re: Line Stats Analysis Results

They are using max sync, distance from the VRAD, S/N ratio, stat errors, line guage and conditon to

dole out the 32/5 profile on a very slow rollout so that they get it right and don't generate TS calls due

to this. :smileywink:

 

Chris


Please NO SD stretch-o-vision or 480 SD HD Channels
1-800-983-2811 to avoid Mr. Voice Recognition
YRMV IMHO Simply a U-verse user, nothing more
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
Message 121 of 283 (971 Views)
Expert

Re: Line Stats Analysis Results

FYI, we have the 32 profile now and your new chart shows that correctly. :smileywink:
Message 122 of 283 (971 Views)
Expert

Re: Line Stats Analysis Results


spd2demun wrote:
FYI, we have the 32 profile now and your new chart shows that correctly. :smileywink:

 

Congrats, spd!

 

Now you can hurry up and wait for 3HD like the rest of us! :smileywink:

 

Message 123 of 283 (971 Views)
Expert

Re: Line Stats Analysis Results

Uh, huh...and I'm blaming this NEW PROFILE for the death of my DVR! :smileymad:  :smileyvery-happy:  Yay!!

 

So you need me to check to see if anything changed from the old stats posted?

Message 124 of 283 (971 Views)
Expert

Re: Line Stats Analysis Results

spd,

 

Can you confirm that your max rate stayed relatively the same, but the noise margin dropped, consistent with moving nearly horizontally to the left from the red line to the blue line on my chart?

 

Message 125 of 283 (971 Views)
Expert

Re: Line Stats Analysis Results


Yes, yes, and yes...

 

 


 

 BEFORE--

 Max Rate:  57396

 

 Noise:   25.5

 

Attenuation:12.0

 

Output Power: 14.3

 

 

 

 

DSL

     

 

Current Rate:   32200 kbs   5040 kbs
Max Rate:
56903 kbs

 

N/A

Current Connection:
  Current Noise:
22.0 dB   N/A
  CurrentAttenuation:
12.0 dB   N/A
  CurrentOutputPower:
14.3 dBm   -18.4 dBm
 
IP   Bytes   Packets   Drops   Errors   %
Transmit:   320   0   0   0   0
Receive:   273720   198   0   0  

0

Message 126 of 283 (971 Views)
Contributor

Re: Line Stats Analysis Results

Can you please tell me the condition of my line and if I would be able to get the 32/5 profile?

 

http://adslm.dohrenburg.net/tools/db-link.php?link=1641

Message Edited by julidelara on 02-13-2010 03:42 PM
Message Edited by julidelara on 02-13-2010 03:43 PM
Message 127 of 283 (971 Views)
ACE - Expert

Re: Line Stats Analysis Results

Your max rate 41.7M and noise margin of 17.5 db put you just inside SomeJoes's 32/5M profile.  You

should be able to get the 32/5M profile as long as everything lines up good. :smileywink:

 

Chris


Please NO SD stretch-o-vision or 480 SD HD Channels
1-800-983-2811 to avoid Mr. Voice Recognition
YRMV IMHO Simply a U-verse user, nothing more
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
Message 128 of 283 (971 Views)
Tutor

Re: Line Stats Analysis Results

Hi, new to this forum. Signed for Uverse since 07 and have been very happy with it unitl I found that others are able to get 2 HD stream.

How do I go about correcting this or finding out if I'm able to get 2 HD stream and if the 32/5 profile will be available for my area.

Message 129 of 283 (971 Views)
Expert

Re: Line Stats Analysis Results


JChin wrote:

 

Hi, new to this forum. Signed for Uverse since 07 and have been very happy with it unitl I found that others are able to get 2 HD stream.

How do I go about correcting this or finding out if I'm able to get 2 HD stream and if the 32/5 profile will be available for my area.


Welcome to the forum!  Please post your stats using the link below:

 

http://192.168.1.254/xslt?PAGE=J03&THISPAGE=A02_POST&NEXTPAGE=J03

Message 130 of 283 (971 Views)
Tutor

Re: Line Stats Analysis Results

DSL   Down   Up Current Rate:   32200 kbs   5040 kbs Max Rate:   52353 kbs   Not Available Current Connection:   Current Noise Margin:   19.5 dB   Not Available   Current Attenuation:   18.0 dB   Not Available   Current Output Power:   14.3 dBm   -9.5 dBm   IP   Bytes   Packets   Drops   Errors   % Transmit:   7117230751   43100037   199   0   0 Receive:   1405146534981   1030762716   13   0   0 DSL   Down   Up Current Rate:   32200 kbs   5040 kbs Max Rate:   52353 kbs   Not Available Current Connection:   Current Noise Margin:   19.5 dB   Not Available   Current Attenuation:   18.0 dB   Not Available   Current Output Power:   14.3 dBm   -9.5 dBm   IP   Bytes   Packets   Drops   Errors   % Transmit:   7117230751   43100037   199   0   0 Receive:   1405146534981   1030762716   13   0   0

 

Sorry if I don't know how to paste this or show up on this post.

Message 131 of 283 (964 Views)
Expert

Re: Line Stats Analysis Results


JChin wrote:


DSL   Down   Up Current Rate:   32200 kbs   5040 kbs Max Rate:   52353 kbs   Not Available Current Connection:   Current Noise Margin:   19.5 dB   Not Available   Current Attenuation:   18.0 dB   Not Available   Current Output Power:   14.3 dBm   -9.5 dBm   IP   Bytes   Packets   Drops   Errors   % Transmit:   7117230751   43100037   199   0   0 Receive:   1405146534981   1030762716   13   0   0 DSL   Down   Up Current Rate:   32200 kbs   5040 kbs Max Rate:   52353 kbs   Not Available Current Connection:   Current Noise Margin:   19.5 dB   Not Available   Current Attenuation:   18.0 dB   Not Available   Current Output Power:   14.3 dBm   -9.5 dBm   IP   Bytes   Packets   Drops   Errors   % Transmit:   7117230751   43100037   199   0   0 Receive:   1405146534981   1030762716   13   0   0

 

Sorry if I don't know how to paste this or show up on this post.


Your current rate of 32200 kbs indicates that you are already on the 32/5 profile.  You can check to see how many HD streams you are currently receiving by navigating as follows from your TV: 

 

            Menu -->  Options --> System Options --> System information --> System Resources

 

What is the "WAN Profile"?

Message 132 of 283 (964 Views)
Tutor

Re: Line Stats Analysis Results

Thanks for the respond texasguy37.

Wan - 3 SD / 1 HD max 18900000

Message 133 of 283 (964 Views)
Expert

Re: Line Stats Analysis Results


JChin wrote:

 

Thanks for the respond texasguy37.

Wan - 3 SD / 1 HD max 18900000


Call Customer Support and request that you be upgraded to either the 2 HD or 3 HD stream profile.  Currently, the 3 HD stream profile is not available in every market.  Where are you located? 

 

Also, did you have HD service at the time of your initial install, or did you add HD service sometime after your install?

Message 134 of 283 (964 Views)
Tutor

Re: Line Stats Analysis Results

Orignally did not get HD service at time of sign up. Added HD service alittle over a year ago.

Located in Mesquite Texas (Dallas area).

Message 135 of 283 (964 Views)
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