Connection keeps dropping
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Connection keeps dropping
23-07-2010 6:41 PM
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I'm happy to replace the modem if that's the likely cause, but I'd prefer to be able to eliminate a service/line fault first if possible. Is there a convenient way to do that (given that it seems to be working OK at the moment)?
I've checked that there's nothing (other than the modem) connected without a filter. I don't have a BT 'master socket' (just an old style junction box in the loft) so I can't just plug in to that to eliminate the internal wiring, but there have been no changes to any of that for years.
Edit: Oops, forgot to attach the stats - here they are, sorry about the lack of formatting:
ADSL STATISTICS
Mode: Autosense
Type: Interleave
Line Coding: Trellis
Status: SHOWTIME
Downstream Upstream
Rate (Kbps): 896 448
SNR Margin (dB): 11.6 17.0
Attenuation (dB): 58.0 31.5
Output Power (dBm): 15.8 11.9
Super Frames: 3462119 3462062
Super Frames Errors: 1388059 17
RS Words: 58856026 58855054
RS Correctable Errors: 49754782 89
RS Uncorrectable Errors: 1825146 0
HEC Errors: 987513 6
OCD Errors: 3 0
LCD Errors: 0 0
Total Cells: 123198510 0
Data Cells: 1280364 0
Bit Errors: 0 0
Total ES: 50665 0
Total SES: 50041 0
Total UAS: 3361 0
Re: Connection keeps dropping
23-07-2010 10:51 PM
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Quote from: Boxersoft I've checked that there's nothing (other than the modem) connected without a filter.
That's not right. The modem needs a filter, just the same as everything else! The only difference is the modem plugs into the ADSL socket on the filter. Some people make a mistake and use the wrong type of cable but the cable between the modem and the filter should have the same (smaller) connector on each end.
Re: Connection keeps dropping
24-07-2010 10:40 AM
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Re: Connection keeps dropping
24-07-2010 10:52 AM
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Can you carry out a simple test over night when you don't need the phone
Disconnect all other items from the phone line and connect the router to the test socket and report the stats in the morning. If you have a spare router cable can you try that. Note that you will probably need to use a filter due to an incompatible connection
If the errors are as bad then it is a line problem but if they are very low it is something in your property.
Re: Connection keeps dropping
24-07-2010 11:42 AM
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Quote from: Boxersoft No, I don't think so. Analog devices (phones, faxes etc.) have to be filtered, but the ADSL modem shouldn't be. What you're describing is a filter/splitter, in which the phone socket is filtered but the ADSL side is just an unfiltered passthrough as far as I am aware.
Maybe you are correct, electronics is not my forte. I had always assumed that there was a high pass filter on the ADSL side of the filter/splitter as well as a low pass filter on the phone side. However the cable you are using to connect your ADSL modem to the phone socket cannot be the one that was supplied with that modem.
Re: Connection keeps dropping
24-07-2010 12:00 PM
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However, I tried leaving the modem switched off last night. This morning it seemed to take a long while to reconnect, but since it did it's been fine and surfing feels as snappy as it ever did (I only get about half a megabit due to distance from the exchange). Checking the modem logs now (after 2.5 hours uptime) it's showing far fewer errors (details below). With a more stable connection I was more easily able to check the PlusNet site and noticed several 'Planned 21CN Broadband Network Maintenance' items with the advice "Any customers having problems connecting once the maintenance is complete are advised to switch off their equipment for 30 minutes before powering it back up and attempting to reconnect". I was wondering whether this might be what was causing the instability here and, if so, whether the overnight rest might now have settled it somehow. Does that seem at all likely?
=====================
Mode: Autosense
Type: Interleave
Line Coding: Trellis
Status: SHOWTIME
Downstream Upstream
Rate (Kbps): 896 448
SNR Margin (dB): 11.4 17.0
Attenuation (dB): 59.0 31.5
Output Power (dBm): 15.8 11.9
Super Frames: 561620 561623
Super Frames Errors: 12 3
RS Words: 9547544 9545602
RS Correctable Errors: 116065 49
RS Uncorrectable Errors: 65 0
HEC Errors: 10 1
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 20176152 0
Data Cells: 853231 0
Bit Errors: 0 0
Total ES: 30 0
Total SES: 9 0
Total UAS: 237 0
Re: Connection keeps dropping
24-07-2010 12:01 PM
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Quote from: Oldjim ... connect the router to the test socket ...
No Test Socket, Oldjim, as Boxersoft mentioned earlier. In the absence of a Test Socket the best thing to do is to unplug all other phone equipment (in case one of the filters is faulty).
Re: Connection keeps dropping
26-07-2010 11:07 AM
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Re: Connection keeps dropping
26-07-2010 11:37 AM
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Re: Connection keeps dropping
26-07-2010 12:02 PM
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Re: Connection keeps dropping
31-07-2010 7:15 PM
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The replacement is behaving much the same way - connection stability varies from several hours rock-solid down to mere seconds - it's been unusable all afternoon. I've also discovered that I do in fact have an NTE5 master socket after all - an unused and overlooked socket. I tried connecting directly to the inner socket of that but it's no more stable than otherwise, so I'll go ahead and file a report.
Actually I'm beginning to suspect some correlation with rainfall (we've had a fair bit of it recently). I don't know if it's possible that a joint somewhere is suffering ingress but, in any case, stability is clearly extremely variable. Presumably if the line is tested (or whatever happens) during a good period, nothing will show up. What happens in such cases?
Re: Connection keeps dropping
02-08-2010 1:55 PM
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Re: Connection keeps dropping
02-08-2010 8:32 PM
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Now being referred.
Re: Connection keeps dropping
03-08-2010 7:35 AM
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] Do you have a Netgear?
Quote Those large numbers for the downstream margin are the result of a small bug in the Netgear firmware. What they actually mean is that the noise margin is negative, so it's no surprise that the router loses sync soon after.
OT a bi,t but here is something about that number http://en.wikipedia.org/wiki/2147483647.
Re: Connection keeps dropping
03-08-2010 9:39 AM
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This is with a Solwise ADSL unit that I got to replace a D-Link that I thought might have been the cause of the problem. The D-Link was consistently reporting SNRMs around 11 - 13. The Solwise has consistently shown it as a huge positive number (presumably that same special value), but is generally working well apart from the line drops (which, although still troublesome, are less frequent and less persistent than they were).
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