I gained at least one insight from it concerning the Noise Margn reading. As chance would have it, my HH5 reset the connection while I was reading all that background stuff, and on going back to the RouterStatsHub5a readings, I saw that the Noise Margin readings had been bouncing along just above or just below 0dB for quite a while.
Given the explanation of Noise Margin above, this would suggest that the HH5 could no longer maintain the link with such a low noise margin - the SNR whatever value it actually was had dropped below the minimum required.
Here's my graph - you can see the moment when the connection is re-set. That's why I wasn't surprised to see different values for upload about 6dB and download ideally around 3dB, which is what it jumped back up to after the reset ;. I'll leave the software running and wait unti the Noise Margin drops again and do it then;. In fact I haven't even confirmed yet that I can get to it That actually fits with another factor that I haven't mentioned on this thread.
All these problems started about the time we got the free upgrade from 54Mbps to 76Mbps. Do you think it'd possible that our connection switched to one on which the 3dB noise margin is being trialled at that time? On other issues - I've had the main plate on my OpenReach dual socket box off, and under it I can see just one phone jack socket.
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Before people wade in to argue, I'm a broadband support agent with one of the UK's biggest Bb providers, and deal with this daily. But to answer the question, UK lines aim for a margin of 3dB, most are stable at 6db, anything over 12dB is worrying and will be very slow. Thanks for actually answering the question!
Could you please advice how to manage the noise margin, like if the noise margin is very high 31db how can we minimize and what is the possible impact. Thank you. A few notes: 1 dB is not a unit, it's simply a way to look at things in a logarithmic scale. Instead of saying , , , I could say 20 dB, 30 dB, 60 db. The common use of dB when discussing noise is due to the high amount of variability in signal and noise amplitudes, which would otherwise necessitate use of cumbersome numbers. It could be high because noise is low, which is a good thing.
The British engineers looking to minimize SNR are relying on persistently high noise to look at the signal-to-noise ratio as a measure of the signal's amplitude, which is a really bad practice because some lines have less noise, and because they could simply look at the amplitude of the signal directly instead.
My ISP provider is BTand since this happened the hub has disconnected the internet for about 1 minuet, it does this about every 8 hours or so on and have been advised that it can take up to 5 days to stabilize. Can you please advise thanks. I found the "opposite" opinions on whether the SNR margin is better high or low confusing.
I did some reading in Wikipedia and I came to the conclusion that the reason for the opposite opinions is likely due to an assumption of what the SNR margin is representing. By my reading the SNR margin is negotiated between the subscriber ADSL device and the provider and represents the percentage of the theoretical data throughput that will be used.
Sorry, guys, but I am of the opinion that a low SNR is bad, and a high one is good. Perhaps you are mistaking SNR for attenuation? With attenuation, higher dB's is good and low dBs is bad.
My ISP's system backs this up. A value below 6dB can cause problems. Attenuation A value below 55dB is good. I'm sorry guys but I consider that in essence this article is correct, so most comments are unnecessary, redundant or superfluous. Some are correct and clarify the subject though. A high SNR margin is both good and bad. It's good in the sense that the line will be stable and won't drop out very often due to interference.
However higher connection speeds need higher SNRs, so having more margin means that the connection speed is slower than it might otherwise be. As has been said elsewhere, a target of 6dB SNR margin is the usual starting point. At the moment I've got a downstream SNR margin of 6. The modem reports a max upstream data rate of 4Mbps but the data rate is capped at 2Mbps hence the high SNR margin. So those numbers tell me the upstream connection is running more slowly than it could do, but it's pretty bombproof.
Can I go to upper speed, like 14 or 16Mbps or I will reach bad line parameters? So here is what I got. I work for a ISP. This is my line going to my house. I have my line set for Interleaved as I have and get a lot of errors on the line. I have tried Fast which is a option for the system to ignore errors on the line but it's less stable. So you can go slow and steady with Interleaved on or Fast and reckless with Fast. My line is set up on G.
Most of the time we will try a new loop to see if running a new wire from the poll to the house make anything better.
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