Gateways and FEC errors
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Gateways and FEC errors
25-06-2015 3:59 PM
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I use a ZyXEL SBG3300-N with DSLStats and have reported this to PlusNet in the past, including graphs but as yet they have not been able to see this issue live for themselves.
Not sure if anyone else has the same issue and sorry can't be more specific but I'll start logging the gateways that are giving me problems.
Re: Gateways and FEC errors
25-06-2015 4:04 PM
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They aren't linked to the gateway you're connected to at all (in fact they're not even related to the Internet connection, it's literally just the connection between you and the exchange/cabinet), so I think it is a strange coincidence that you appear to get more FECs when connected to certain gateways.
Is there anything else happening when you get these FECs? I think it might be interference.
Re: Gateways and FEC errors
25-06-2015 5:08 PM
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If it is interference surely it can't local to me otherwise I'd see it regardless of gateway?
It seems to happen for an hour or two at a time then suddenly drops back down again, usually in the evenings.
I've just hopped gateway again so let's see if last nights huge increase happens again this evening.
Here's an example from last month when I reported it to Plusnet:
Re: Gateways and FEC errors
25-06-2015 6:19 PM
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If you had no connection to Plusnet and just left the modem in sync with the DSLAM, you'd still get FECs.
Re: Gateways and FEC errors
25-06-2015 6:58 PM
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As AlecR has said FEC's are corrected errors they are not a significant problem.
At the bottom of your graph it shows "ES/hour: 2.54" this is a much more meaningful measure and that figure of only 2.54 errored seconds per hour is exceptionally good.
As an example my ES/hour averages over 50.
IMO your FEC graph is nothing to worry about.
Re: Gateways and FEC errors
25-06-2015 7:21 PM
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Quote from: npr Does the increase in FEC coincide with when your downloading / watching streaming content ?
But like I say throughput on the line wouldn't affect the errors generated. They are generated between your line and the cabinet, and occur whether you're connected to Plusnet's network or not.
But apart from that, what it means is that there's probably some interference on your line at some times of day, which would generate lots of errors but FEC error correction is doing its job and is preventing most of those. It means DLM isn't going to slow your line down or really modify it at all as the other errors are very low indeed.
I'd like to see your QLN and Hlog graphs please, OP
Re: Gateways and FEC errors
25-06-2015 7:55 PM
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Quote from: npr Does the increase in FEC coincide with when your downloading / watching streaming content ?
As AlecR has said FEC's are corrected errors they are not a significant problem.
At the bottom of your graph it shows "ES/hour: 2.54" this is a much more meaningful measure and that figure of only 2.54 errored seconds per hour is exceptionally good.
As an example my ES/hour averages over 50.
IMO your FEC graph is nothing to worry about.
Appreciate your comments, just driving me mad as to why it only happens on some gateways
No it's doesn't seem to coincide with anything I do online, it can happen when I've just got my PC sitting idle and nothing is going on.
Re: Gateways and FEC errors
25-06-2015 8:03 PM
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Quote from: AlecR
Quote from: npr Does the increase in FEC coincide with when your downloading / watching streaming content ?
But like I say throughput on the line wouldn't affect the errors generated. They are generated between your line and the cabinet, and occur whether you're connected to Plusnet's network or not.
But apart from that, what it means is that there's probably some interference on your line at some times of day, which would generate lots of errors but FEC error correction is doing its job and is preventing most of those. It means DLM isn't going to slow your line down or really modify it at all as the other errors are very low indeed.
I'd like to see your QLN and Hlog graphs please, OP
Current QLN and HLog attached.
Strange thing is it's at random times of the day and only on certain gateways. If I hop I can be free of high FEC's until PlusNet force be onto another one, just pot luck which I get, like everyone else
Re: Gateways and FEC errors
25-06-2015 8:28 PM
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In short, I don't think you've got much to worry about
Re: Gateways and FEC errors
25-06-2015 8:34 PM
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Noise during the day is usually pretty low, rising as expected in the evening but I still get these random bursts of FEC's at all times during the day regardless of noise.
It's all very weird and as an Engineer it's driving me nuts not knowing why
No huge bursts at all so far this evening since gateway hopping again earlier this afternoon
dick:quote
Re: Gateways and FEC errors
25-06-2015 8:48 PM
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As a previous poster mentioned, VDSL2 only runs between your cabinet and your modem. It doesn't care what gateway you are connected to.
Not convenient, but you can progressively switch electrical items off to try and correlate it with reduction or removal of the noise.
If you use powerline adapters, stop using them and see if the noise is present.
Any switch mode power supplies (e.g. laptop power supplies, mains chargers etc), try and switch them off and monitor for noise.
You could plug the modem and router straight into the master socket and monitor for noise (if not already in the master socket).
It is going to take a bit of detective work, but ignore the gateway stuff for now, and see if you can isolate the noise to internal noise (internal to your house), or external noise.
In my case, I had powerline adapters which were injecting a lot of noise onto the line.
How often to these burst of errors come? (how many times a day on average). Is it worse or better at night? How long does a burst last for?
Best of luck.
Re: Gateways and FEC errors
25-06-2015 11:28 PM
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I thought I'd post as it hadn't happened for around 5 weeks then I got a huge spike for over an hour last night, again nothing today.
As an Engineer (who actually manufactures and installs subsea umbilicals for a living) I'm more than competent at using elimination to fault find, this however does not follow any pattern at all.
As for the power line adaptors, not the problem here as I ditched mine well over 2 years ago as they induced so much noise I was losing around 3dB on the SNR with them switched on.
dick:quote
Re: Gateways and FEC errors
25-06-2015 11:33 PM
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I had a similar issue a year or so ago, in which my SNRM would drop 1-2dB in a matter of seconds from its target of 6dB. Eventually Openreach came out and a REIN case was created. It took a while but the issue was eventually resolved.
I'm now having other issues (hence why I'm looking to come back to Plusnet) but my connection was better since the OR fix.
I'd like to see your SNRM graph too if you don't mind?
Re: Gateways and FEC errors
26-06-2015 12:47 AM
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Re: Gateways and FEC errors
26-06-2015 10:45 AM
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Random noise on the line could be because of a line fault, or more likely something generating noise between you and the cabinet.
FECs aren't a problem (they're errors that have been corrected and this doesn't penalise your throughput): ES and SES (errored seconds) are the things to look out for, since these are used by the DLM to decide whether you should be interleaved or if your connection needs to be slowed down to make it more stable.
If it helps, whenever there's any kind of thunderstorm my errors go through the roof - likewise when the neighbour mows the lawn...
Is there any pattern to your Error Seconds?
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