Drop of SNR in working hours
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- Drop of SNR in working hours
Re: Drop of SNR in working hours
08-03-2011 4:42 PM
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At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
08-03-2011 6:56 PM
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What does the bitswaps vs time plot look like? That's the one on the third tab. In my case that shows mainly 0 or 1 during daylight hours, rising to 10-15 after dark when lights and electrical things are on in our neighbourhood. Successive samples form a solid blue plot then.
Does your phone line run on poles or underground? Not sure if that makes any difference.
Re: Drop of SNR in working hours
09-03-2011 3:39 AM
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Quote from: spraxyt I guess that suggests the cause is something electronically noisy that shouldn't be.
The engineer who made the best inroads on my issue said the major cause he encountered was either faulty earthing or (more likely these days) cheap asian made TVs etc that were not earthed at all when they should be. BTs Comtrend made Homeplug units are also notorious for interference, as are neon strips with starters that are reaching their sell by and Sky boxes.
If possible, you should try to run routerstats 24/7, and take a careful note of the start/finish times/days and any multiple occurrences in a day. It might help you to nail the source to domestic/industrial/retail premises nearby, depending on the makeup of the area you live in, and it might help convince BT there is an issue if it gets that far with the faults team.
If it perseveres, at some point you should try shutting down every electrical device in your own property and check if there's still a pulsing noise on the radio (assuming that does correlate to the times the SNR drops). It's surprising how many things around the home have internal cycles or timers, although in all probability, if the timing doesn't ring a bell, its nothing to do with you.
Edit: added Sky box
Re: Drop of SNR in working hours
09-03-2011 11:46 AM
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[EDIT] My Broadband Speed - History for this morning showing decline in performance added.
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
09-03-2011 12:14 PM
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I'm still waiting for the email response. I'll keep you posted.
Jojo
Re: Drop of SNR in working hours
13-03-2011 9:53 AM
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Somehow lost my bitloading information on Routerstats so I can only report observations from when it was working OK - During the day when the line is 'clear' there are very few bitswaps (the odd 1 or 2 in some minutes, usually none) but when the line problem occurs this rises to an average of 50 per minute.
I did set Routerstats to monitor CRC errors as a User-Defined plot, this has proved very interesting as the rate of CRC errors is quite steady when the line is good and suddenly increases to a much higher (but still steady) rate when the line problem occurs (roughly 1,440,000 in just under 7 hours or about 340 per minute) the graph shows this very clearly.
The bitloading (when it was working) shows a distinctly different pattern between 'line good' and 'line bad' conditions, when the problem occurs there is a drop across tones 210 to 280 with a corresponding increase in lower (and higher) tones - even using the previously unused tones 339 to 343.
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
14-03-2011 9:55 PM
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I have tried two routers and 3 filters, no ring wire all in the test socket. It can happen at anytime of day. both routers are adsl 2+ listed.
PN are sending me out a test router. Walker23 I have checked and we are not on the same exchange it's just that we have similar symptoms.
Not sure when I should receive any contact from PN.
Re: Drop of SNR in working hours
14-03-2011 10:29 PM
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I have a BT engineer coming tomorrow morning to investigate, I just hope the problem manifests itsself at the time, at least mine is fairly predictable regarding time of day, just it doesn't happen every working day.
I'll let you know if there's any useful outcome.
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
14-03-2011 10:41 PM
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I keep updating pn via the ticket with screen captures and phone calls it turns out each update may be knocking my ticket to the back of the que so I don't know when I'll get a resolution. called tonight to find out faults stop at 9pm so another call wasted.
will keep an eye out for your resolution too.
Re: Drop of SNR in working hours
15-03-2011 1:10 PM
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I await the inevitable drop in SNR margin when it next decides to happen.
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
15-03-2011 3:41 PM
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Re: Drop of SNR in working hours
16-03-2011 1:54 PM
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Ticket updated acordingly but unable to attach a routerstats capture on the ticket (on each of 3 attempts it said attached file was invalid), I assume this may be because of the terrible line performance.
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
16-03-2011 1:57 PM
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At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: Drop of SNR in working hours
16-03-2011 2:22 PM
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I can see the SNR drop in the graph, but your connection's been live for over 24 hours now at a profile of 6000 so it shouldn't be making a difference to your service. If it is please advise what you're seeing when it happens?
Re: Drop of SNR in working hours
16-03-2011 2:29 PM
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the problem has never been anything to do with disconnections, I think this issue has only caused one or perhaps two disconnections over that past weeks, almost all disconnections have been me tryting to resolve the problem (the last ones were probably the BT Engineer).
The issue is, when the SNRM drope and CRCs fly up webpages (like this one just now) take ages to load and the internet becomes almost unusable (certainly if I'm trying to work from home).
I'm guessing that the high CRC rate means a lot of re-transmitted data to actually get things through causing a massive slow-down.
I hope the re-transmissions don't count as part of my useage
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
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