SNR is 3.0dB !? Frequent disconnections in the evenings too.
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SNR is 3.0dB !? Frequent disconnections in the evenings too.
09-10-2010 9:47 PM
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I notice from my router stats that the SNR drops to 2.5-3.0dB in the evenings, from about 5dB during the day.
I'm no expert, but 3dB seems very low... can anyone (esp. from PlusNet) tell me if this might be the cause of my flaky evening broadband? If it is, what can I do about it? (I've already tried all the usual stuff - plugging directly into the master socket, swapping microfilters, removing all other equipment from the line and so on).
If it's any help, here are my router stats about ten minutes after retraining the connection and then starting to download Mad Men on the BBC iPlayer - those upstream line error counts look suspiciously high...
Protocol ADSL State ShowtimeThanks! Phil
Data Path Interleave
Operation Mode G.DMT
Downstream Upstream
Line Status ADSL Link Speed 4512kbps 448kbps
SNR 3.0 dB -
ATEN 42dB 25dB
Line Error ADSL layer FEC 2 42630
CRC 0 25755
ATM layer HEC 3 22660
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
09-10-2010 9:57 PM
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This will drop your speed to about 4200kbps and your profile to 3500 kbps
Having said that you should be getting much better speeds with that attenuation
Can you plug the router into the test socket and report the stats immediately after (I suggest waiting until tomorrow morning to do it for a proper comparison)
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
09-10-2010 10:13 PM
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I've been doing pretty much what you recommend already, if only to try & keep the broadband alive & useable in the evenings, but things don't seem to be improving. The router (D-Link DSL-504) stays on all the time & I've been retraining the connection to re-establish it each time it drops out (in preference to either waiting for it to come back on its own, or physically switching the router off & on again).
Unfortunately I have an old-style BT master socket without the test socket inside.
I'd gladly trade a bit of line speed for a more robust connection though. Any ideas?
Cheers, Phil
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
09-10-2010 10:41 PM
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Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 10:58 AM
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Incidentally, I left it on all night and this morning it was not connected so I unplugged the router for a while. When I switched it back on, the sync speed was a rather impressive 4960kbps (highest I've seen it) and the SNR was still 3dB. Despite the low SNR, the connection has been rock solid so far this morning and I've downloaded about 1.5GB of iPlayer programmes. I also notice the line error stats are different - Upstream ADSL layer FEC is high (30,000 or so) but all the others are less than 20, whereas in the evenings they climb into the tens of thousands.
I'll monitor it all day but I expect it to go bad again when it gets dark...
Phil
Edit: SNR just went up to 4dB (11am)
[Moderator's note by Dick (Strat): Full quote of preceding post removed, as per Forum Rules ]
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 6:03 PM
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The first is that the default noise margin at the exchange seems to be set at 3DB which is most unusual
The second (and this is why you are seeing the problem) is that when the router loses sync it doesn't automatically reconnect.
Can you borrow another router to test - you could get one from Plusnet for £4.99 p&p but with a 12 month tie in (you need to pay the full cost if you leave before 12 months) - or you could bite the bullet and buy one
Have you looked for an updated firmware for the D-Link
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 6:35 PM
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Depending on what state your wiring and sockets are in, you may be able to achieve the same result with one of the faceplates on sale. Otherwise, there are diagrams on how to cut the bell wire on the Kitz site. There's a roundup of possible solutions to low SNR problems here.
http://www.kitz.co.uk/adsl/lowSNR.htm
Graham
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 6:40 PM
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Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 6:59 PM
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I'm currently monitoring my router's stats to see how things progress. The SNR, which has been at 4.5 all day, has now dropped to 4.0 simultaneous with a startling change in the pattern of upstream FEC errors. I'll post the graphs a bit later. Suffice to say for now that the changes coincided with the street lights around here starting to come on.
Oldjim, the router is pretty old and may be having trouble resynching. I'll look into a replacement - I've heard good things about the Netgear DG834 being a good one at keeping sync. So far as I know there has not been a firmware update for my current one since it was launched.
As for the low noise margin setting at the exchange, presumably there is a way to request an increase - any idea how I do that?
18:50 - OK my connection just dropped out for the first time today. Router reconnected itself about four minutes later but the SNR is now down to 3.5. From here on I would expect increasingly frequent disconnects until the broadband becomes effectively useless.
Graphs to follow...
Phil
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 7:13 PM
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You can also tweak the noise margin yourself using DMT
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 7:21 PM
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Thanks for the Netgear info. DMT is the tool available from Kitz.co.uk?
Phil
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 7:23 PM
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and I think you need v8.07
http://forum.kitz.co.uk/index.php?topic=1891.0 discusses it
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 8:28 PM
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Quote from: Oldjim The poster has an old style socket so non of the above is relevant
There's no reason why the OP cannot remove the ring wire(s) from pin 3.
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 9:53 PM
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Re: SNR is 3.0dB !? Frequent disconnections in the evenings too.
10-10-2010 10:05 PM
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Quote from: phile I've already tried all the usual stuff - plugging directly into the master socket, swapping microfilters, removing all other equipment from the line and so on
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
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