Downstream SNR varying wildly
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Re: Downstream SNR varying wildly
21-03-2016 11:01 PM
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Quote ip route
Probably gives most info, eg:
Quote 195.166.128.195 dev ppp0 proto kernel scope link src 146.90.63.166
192.168.2.0/24 dev br0 proto kernel scope link src 192.168.2.1
default via 195.166.128.195 dev ppp0
so I get the default gateway, as well as ppp being used for routing. But don't get to see LCP messages. I'd hoped that sending -USR1 to pppd would give more messages, but no cookies yet ...
Think the crux is that LCP messages withh only happen in the pppd process - so need a way of accessing those. In a read only file system it is hard to set up somehing like pppd, however the standard TP-Link http interface does give LCP messages, so there must be a way of accessing this info ...
Re: Downstream SNR varying wildly
22-03-2016 3:40 PM
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Re: Downstream SNR varying wildly
23-03-2016 9:12 PM
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[Just checked, reading documentation, the command you want is:
Quote iptables -L -v -n
I havn't checked this on the router yet - and as logging is currently active, I can't log on to check]
I run out of time to write the code to process the raw data from the router, so instead just dump everything, every 10s - then compress the log. Means I should now have a record of most things.
@CRT, can you reset the SNR margin on my line to 3db or 6db? I expect the line to during training to increase the SNR margin, but with logging switched on I should be able to dig into what is causing the margin to increase, e.g. if it is an Error Seconds thing or something ...
Re: Downstream SNR varying wildly
24-03-2016 4:05 PM
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Re: Downstream SNR varying wildly
24-03-2016 10:26 PM
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Re: Downstream SNR varying wildly
27-03-2016 7:00 PM
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24/3 17
25/3 17
26/3 17
So seem to be getting a regular 17 error seconds a day (which seems a bit of a coincidence). So is 17 ES a day an issue?
Re: Downstream SNR varying wildly
28-03-2016 2:52 PM
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Re: Downstream SNR varying wildly
29-03-2016 7:47 PM
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ADSL Down stream frequencies are the same used for LW/MW Radio and are the ONLY problem in REALITY that most people have with long distance broadband. I have been fighting these people for THREE YEARS now. I pin pointed the WIRING FAULT three years ago and it was VERY VERY SIMPLE to find using portable radio. At the end of last year a representative of BT kept on phoning till I answered. She claimed to be a RF EXPERT previously working with the RAF. Her and two other engineers came to property around 8pm. I showed them the statistics that I had been collecting for multiple months, and they were able to witness the SNRM problem with their own eyes. I told them where the problem was and how I found it, most of what I said went in one ear and out the other. I told them the pole DP35 had the fault, they went to check came back and said there is a lot of noise at DP36 the next pole after. I questioned them about DP35, she grudgingly replied that there was a lot of noise there too. I tried to explain that it was obvious that if there was noise at 35 then of course there would be noise at 36. She left saying this, I will do everything in my power to fix the fault but there is POLITICS INVOLVED!!???.
She emailed statistics that CLEARLY showed there was indeed a fault. The pair of wires were different lengths by about 100 metres!. They should know that this is an unbalanced pair!. I responded to email and within hours she turned up with an engineer who was trying to convince me the problem was between Rx and Tx, yes LW Atlantic 252KHz is a problem but the worst noise is MW Radio, put aside the local stations, you are not going to track down the FAULT tuning into them. LW can be heard clearly through daytime but at night it becomes fuzzy. MW characteristics are different especially at NIGHT late at night, when its DARK!. Multiple foreign radio stations can be tuned into with portable radio at the pole where the problem is. From 612KHz tune radio above and below this frequency to fine tune. Make sure radio antenna is close to pole with WIRES running down it to underground. Signal should disappear just a few feet away.
The same engineer turned up at door an evening shortly after, again trying to convince me the problem was between Rx and Tx AGAIN!. He then went on to say the lady from RAF was only trying to make a name for herself as she was new to the job!. A sad excuse and more so and pig headed insult to the fairer sex. He then told a story of a customer who stuck a shovel through 100 pair of wires after openreach once again failed to help. He went on to say that this customer got away with this destruction as though he was trying to convince me to do the same. What does he take me for a moron!. He again promised that he would be back to fix the FAULT, never seen him again.
The RAF RF expert then booked an appointment with an REIN specialist. He turned up a day late I personally missed visit but all he did was poke about with a spectrum analyser and antenna. He once again cleared the property from being source of noise, then visited neighbouring properties where he found that I wasn’t the only one suffering from broadband drop-outs. It took 2 MONTHS for a reply to his findings, and this is what he said. 1.1MHz = 1100KHz was the source frequency of REIN and that he couldn’t track it down!!. 1089KHz is Talksport, 1109KHz is MFR 2 and a French station at 1098KHz all are in the mix. She replied saying that they had completed the work and once again avoided fixing the FAULT!. What I have learned over the last 3 years is, Openreach are 100% controlled by BT. BT walk hand in hand skipping down the street with WESTMINSTER POLITICANS and is run by them too. Its about time these morons, who are a cankerous growth on society, were radically reformed...
[Moderator's note by Mike (Mav) Derogatory term used for forum member removed as per forum rule.
Re: Downstream SNR varying wildly
29-03-2016 9:19 PM
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Thats a bit of a rant and a half.
I work in an engeering company, and have a long histoty in physics/engineering/ and computers. So I have the background to have some knoweldge in this.
Plus.net on this formum keep having to defend, that the connection between the home and the DRM, is in in openreach/bt wholesales hands. Yes its the same company as plusnet, but due to regulation there are walls between the different parts. Now the DRM sets up the speed of the link in the last mile, it does this automatically, but can be tweaked by human hand.
In my case, its clear there is something in that last mile, that during training pushes the SNR margin to high levels. WHat that is hasn't been found yet, but plusnet are not in a possition to find it. Now I and openreach, probably are able to find the problem, given time. However I at least need a bit of help from plus.net - as they can tweak the DRM, in particular reseting the noise margin.
Now I on my part, have taken time and effort, to set up hardware on my end, to monitor the line. Specifically to monitor low level SNR against frequency, and bits per tone. This should mean, that with a fair bit of processing, should be able to track what frequencies, and what times, are giving me a problem. The yes, its walking the street with a MW radio, to find the source. Then negotiation with BT to moan at the noise source. Its not an easy route.
But can you expect plus.net to do this? Lets face it, I pay them just a few pounds a month for the line - that necessarily means limited resources. So can I expect them to do more than is under there control? For me, I'd just be happy if the did the occasional reset of the SNR margin, and the prodding of bt openreach/wholesale - when fault found - this afterall is where my contract is with them for.
And thats the crux, whats in the contract? You can't expect plus.net to do more than the contract.
So stand back, take a deep breath; and relax. Then look at ways that are productive, what you can do, what will help, what is postive, and what is the best way forward.
Re: Downstream SNR varying wildly
30-03-2016 6:49 AM
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You are wasting your breath. As you know this forum is full of Plusnet customers who try and help each other out and get Plusnet to provide the support that is required to resolve problems AND to get the incompetently managed organisation called Openreach to fix some of the line issues that cause problems like the one james1944 is suffering. The last time james1944 posted on this forum - over a year ago - he just ranted on someone else's thread (eventually moved by a moderator - another Plusnet customer) saying his problem was the same as that poster's - I wasn't sure as I remarked his post wasn't well structured it was difficult to follow. He seemed to think that nobody else here understands REIN or RF Interference etc. and just chose to have a go at me when I tried to get some more detail. I'm certainly not a Government HACK as he puts it and certainly don't appreciate his Libel. He'd been sent a deadlock letter by his previous supplier and because of that Plusnet refused to address the problem. He did nothing but rant again and have a go at me seemingly thinking I was a BT engineer when he made a second post, and made no effort to post in a manner that would elicit help from other forum members to try and get his issue resolved. He obviously knows enough to solve his own problems, so good luck to him.
Re: Downstream SNR varying wildly
30-03-2016 11:00 PM
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Re: Downstream SNR varying wildly
31-03-2016 11:41 AM
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Whats initially intersting, the the nES counter has gone a bit random:
nES=4294967289
Worked this out - nES reset to -7 in a 32bit number. Question is why did it reset to -7? Anyway after a handful of errors, it wrappen and went positive again ....
However is incrementing at a fairly slow rate.
Am logging everything right now, probably won't get a chance to look at the detail until the weekend.
Re: Downstream SNR varying wildly
31-03-2016 4:09 PM
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Re: Downstream SNR varying wildly
31-03-2016 6:24 PM
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Nice to see getting data across up to 350 tone. So I do benefir from ADSL2+ doubling the spectrum. Some signals in there are clear, Radio 4 at ~50. Need to identify the others, see if they are medium wave satations.
162 = 698kHz
212 = 914kHz
283 = 1220kHz = 1.22 MHz
Now its a case of waiting for the line to drop, then doing the graph again.
And not unexpectly the ES are up, 41 so far today.
Re: Downstream SNR varying wildly
31-03-2016 8:53 PM
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One way to check the above would be no FEC's between 8:22 and 8:46.
41 Error seconds is fine; my line averages 200/day with no problems.
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