dslrocker3
join:2002-05-26
Toronto
4 edits | reply to dslrocker3
Re: Help/Advice with my Line Statistics please
Let's just say that a few years ago, I was told by a field technician that the line was trouble waiting to happen. I think the technician said something about voltage on the line but that they were not able to fix it/not cost feasible. Supposedly, the pair with the strange voltage readings is the one that is able to provide the higher speed connection but I was essentially warned that it could be problematic in the future. The other pair on the pole behind my house was very clean but couldn't even provide a 1Mbps connection.
When things are working properly, the results at the demarc and at a jack inside the house are usually about the same. But when I check yesterday, espseically with the ST516, that's when I noticed an extreme difference (ie. worse connection at demarc). How is this possible? |
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Bicephale
join:2005-09-24
 ·TekSavvy Solutions..
2 edits | If you've been told that you could "bypass" your house wiring
by connecting directly at the demarcation point then now you
learned the truth about it: it's fundamentally wrong because it
doesn't account for the "antenna effect" of your wiring hidden
behind walls - which can amount to a couple hundred feet in a
private home!... Centralized filtering eliminates confusion, long-
term noise curves reveal daily patterns if any and hence point
at potential local issues. Thomson's SpeedTouch 5x6 combined
to TerTech's 'DSL_StatScope' professional-grade utility is quite
the most user-friendly way available to acquire a better overall
perspective of the situation... Beware of SNR Margins as these
can remain stable for days if not weeks and never give a single
clue about what's really taking place. 'DMT' captures are great
for a quick start, "Diagnosis" mode is powerful when it becomes
more serious but 'DSL_StatScope' is much less involving, IMHO.
This is TerTech's 'DSL-StatScope' thread, for your convenience:
%20.GIF)
Yet Another Modem Statistics tool, Bicephale, 2009-Apr-10
Addendum:
Oh, and 'DSL_StatScope' can record logs which other
readers can "PlayBack" and examine as they see fit.
Also, this short thread illustrates the next step:
The customer's own wiring, Bicephale, 2007-Jun-13
Red is bad, green is good... |
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dslrocker3
join:2002-05-26
Toronto
4 edits | It's interesting how you talk about an antenna effect. When I troubleshooting years ago, I decided to change some of the wiring in the house. I removed some wiring that was causing a problem (maybe a staple in through the wire?) and ran a new line up to my modem.
I wasn't willing to drill through the floors and walls so what I did was bridge from a downstairs jack with cat5e to where I wanted to place my modem on the second floor. The downstairs jack where my connection is bridged acts very strangely. To get the best connection and to get the second floor jack up to par with the other jacks throughout the house, I have to plug in an extension cord into the first floor bridged into jack (and it has to be a certain, specific cord for some reason) and it must be left unfiltered with no device hooked up to it. This adds about 0.5 dB attentuation but gives a better connection. So I guess this all means that less attentuation/least amount of wiring is not always better, depending on many factors. |
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Bicephale
join:2005-09-24
·TekSavvy Solutions..
| When i moved in, my MoDem couldn't be located conveniently
so an HPNA EtherNet extender is the solution i chose to avoid
wiring issues which i just didn't want to address back then. It
would be profitable to remove everything but the DSL device,
electrically speaking - which means using Centralized Filtering
is a must if you haven't tried it yet! Long phone cabling can't
but cause trouble, if it helps that's because something is dead
wrong, as i illustrated in one of the linked threads from above.
In the end, what you should go after is lower noise and hence
fewer disconnections. It doesn't matter what the SNR Margin
is as long as you remain connected... My SpeedStream works
reliably below 6 dB, my SpeedTouch doesn't. Many parameters
may appear to be relative in the DSL world, that's why i prefer
to compare curves these days: i've found better. |
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dslrocker3
join:2002-05-26
Toronto
1 edit | reply to dslrocker3
LOL, I guess that I really shouldn't leave the SNR target set to 1dB since there is an open trouble ticket. I was surprised that on a speed test, I was still able to get 2000/500 Kbps even with all those errors.
On a side note, I've noticed that this ST516 is much better at error correction than the SS5200 E242. The E242 seems fine with interleaved turned on but it's horrible on a high error line if you are on fast path, at least from my observations. |
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Bicephale
join:2005-09-24
·TekSavvy Solutions..
| Have you considered disconnecting everything at the
demarcation point to test your MoDem from there? It
is a tweak you're showing here, right? Hoping for some
happy ending, i guess...
 |
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dslrocker3
join:2002-05-26
Toronto
4 edits | I haven't done that since the profile change that turned interleave on.
When the profile was set to 2496/800 fast path, I was getting about 1850/800 with the SS5200 E242 and about 1000/800 with the ST516v6 at the demarcation box's jack (about 2000/800 and 1700/800 inside the house).
Yes, that last picture was with the tweaked settings. |
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Bicephale
join:2005-09-24
·TekSavvy Solutions..
| Oh, and when i write nothing else connected i mean something like this:
By the way, did you have to bring your 'DMT' gliding cursor up or down?...
 |
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dslrocker3
join:2002-05-26
Toronto
3 edits | I turned down the slider for the target noise margin forcing to modem to pretty much accept any and all signals, regardless of how bad they were.
I haven't tried there yet. With evertyhing disconnected, the only difference from the inside the basement and the grey box would be about 6 feet of thick wire. Could the results actually be theat much better at the bolts in my basement when it is fed by the same jack that I already tested at in the grey box? Long ago, when I was trying to get a stable 1728/640 with a non RE-ADSL modem, I used a phone jack and hooked it up in the basement by using an old ethernet cable that was no longer being used because the clips on the end were broken. I'll have to comptemplate perhaps doing that again - or perhaps "sacrificing" a phone cord by chopping one of the ends of it.
My next step might be to go back to the outside grey box demarcation point and feed an cable like I did before directly to the bolts there, except on Bell side of the demarc making directy contact with the drop wire - although I strongly suspect that Bell really doesn't like it when you do stuff like this. |
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ex bell
@cgocable.net
| said by dslrocker3  :My next step might be to go back to the outside grey box demarcation point and feed an cable like I did before directly to the bolts there, except on Bell side of the demarc making directy contact with the drop wire - although I strongly suspect that Bell really doesn't like it when you do stuff like this. They aren't lurking out there now are they?
Sneak out quick and wire a jack right to the drop wire.
You can wire on to the drop or bsw for a bit unless there is a storm in the area.
Bell doesn't care as long as you put it back together before you have them come there for a repair.
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