DSL stats graphs microanalysis
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- Re: DSL stats graphs microanalysis
DSL stats graphs microanalysis
03-11-2014 6:38 AM
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That DS SNRM won't be going back up until a re-sync, which despite the reading, will most likely achieve a similar speed.
Re: DSL stats graphs microanalysis
03-11-2014 10:38 AM
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Stop caring? Well I guess that's all a matter of what you want to gain - or more to the point prevent. This could be indicative of a deteriorating line or a failing switched mode power supply.
Looking at the three day's plots, the first shows periods of very flat and stable SNRM and other (non-nighttime) variability of circa 1dB - what is the SNRM resolution of your router please?
The second plot shows a step shift in SNRM at 14:45 and is rather indicative of REIN, which up until this morning has not abated. The current error rate is somewhat higher than the preceding two graphs. This is a typical REIN profile.
Personally I'd be checking the phone line for noise on a regular basis and looking for the effects of turning off (not putting into standby) electrical devices around the home and examining the impact on SNRM.
There again, given that the line has not dropped in the presence of interference, you might indeed decide to do nothing. Don't know what router you have, but it is keeping a good hold of the connection!
As for the speed you'll see on a reboot, my money would be on it being lower if the interference is still present.
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Re: DSL stats graphs microanalysis
03-11-2014 10:15 PM
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I've drawn some bits per tone graphs so you can see the frequency the non-existent interference is on. I see there's usually a slight dip there in some historical bits/tone plots. Or perhaps the "interference" was reflected DSL signal bouncing around the wiring.
The SNRM is reported to 0.1db and the reported value flipping between 5.2 and 6 in those hours is pretty common. Although the DS SNRM swimming around down at 3-4 isn't so common.
Re: DSL stats graphs microanalysis
04-11-2014 8:39 PM
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Re: DSL stats graphs microanalysis
05-11-2014 6:25 AM
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04:08 - Get up needlessly early. Look at microfilter at socket with modem/router and telephone connected. Confirmed it was still there.
04:39 - Unplug / plug other microfilter with other telephone attached. Can't remember if I unplugged the telephone from the microfilter or the microfilter from the socket.
05:46 - Unplug / plug telephone from microfilter with modem/router attached and move cables about a little.
I think I'll leave commanding a re-sync until tomorrow, if the telephone being answered today doesn't do that for me.
Re: DSL stats graphs microanalysis
05-11-2014 9:47 AM
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Looks like moving wires - especially the last one - influenced the SNRM.
Would be interesting to know what happens to the tone bins when the wires are moved around. Specifically does that "hole" change?
Do you have an AM/MW portable radio?
Kevin
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Re: DSL stats graphs microanalysis
05-11-2014 7:32 PM
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Yes I do have an AM radio, although I think its only use will be for checking what radio stations are there, although AM radios only start at 531 kHz of course.
Re: DSL stats graphs microanalysis
05-11-2014 9:01 PM
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Re: DSL stats graphs microanalysis
05-11-2014 9:10 PM
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Re: DSL stats graphs microanalysis
06-11-2014 6:40 AM
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I think the changes I made didn't really make any difference. I should probably try another modem/router for comparison purposes, although the netgear achieves a fairly good speed under the circumstances and seems to somehow manage to get away with the drops.
Re: DSL stats graphs microanalysis
06-11-2014 9:01 AM
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Re: DSL stats graphs microanalysis
11-11-2014 1:10 PM
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Edit: permanently attach graph
Re: DSL stats graphs microanalysis
11-11-2014 1:18 PM
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Re: DSL stats graphs microanalysis
11-11-2014 7:43 PM
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The difference in downstream frequency range is not the only difference between ADSL2 and ADSL2+. Regarding the upstream, the permitted power level on the frequencies above the upstream tones (above 138 kHz) is much lower on ADSL2+. Which may explain why the bitloading on the higher upstream tones is reduced when using ADSL2+.
How many times would you like me to swap between ADSL2 and ADSL2+ before you believe the difference in speeds is due to switching modes? For obvious reasons I'm not going to do it more than once per day. I also have the first couple of months of DSL stat graphs on ADSL2+ with similar lower speeds compared to the rest at slightly higher upstream and downstream speeds on ADSL2.
Well of course the re-sync resulted in what's on the graph - it kind of goes without saying that the speeds changed due to the re-sync, because speeds don't tend to change without a re-sync, there's no SRA going on here. The first re-sync was me changing the mode to ADSL2.
I expect many people on long ADSL2+ lines might achieve higher speeds from switching to ADSL2. The only reason they need to change that setting manually is because some exchanges (perhaps older 21CN ones?) don't seem to automatically select ADSL2 for those long lines. Others just seem to automatically end up on ADSL2.
Re: DSL stats graphs microanalysis
11-11-2014 8:39 PM
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Quote from: ejs How many times would you like me to swap between ADSL2 and ADSL2+ before you believe the difference in speeds is due to switching modes?
Never said it wasn't, particularly on your connection. Sometimes you read too much into what I do say I did say in the particular case of one connection at the moment that it wasn't going to make the slightest bit of difference because of the state of the connection/modem-router, and in any event, I still reckon it falls more into the category of fine tuning, but anyway, we will debate more shortly
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